CN110468343B

CN110468343B - TiC precipitation reinforced high manganese steel base composite material and preparation process thereof

Info

Publication number: CN110468343B
Application number: CN201910890507.1A
Authority: CN
Inventors: 骆智超; 宁嘉沛; 郑开宏; 王娟; 郑志斌; 龙骏
Original assignee: Guangdong Institute of Materials and Processing
Current assignee: Institute of New Materials of Guangdong Academy of Sciences
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-12-08
Anticipated expiration: 2039-09-20
Also published as: CN110468343A

Abstract

The invention relates to the field of alloys, in particular to a TiC precipitation reinforced high manganese steel base composite material and a preparation process thereof. The TiC precipitation reinforced high manganese steel base composite material comprises TiC reinforcement particles, the volume fraction of the TiC reinforcement particles is 3.3-14.3%, and the TiC precipitation reinforced high manganese steel base composite material comprises the following chemical components in percentage by weight: c: 1.6-2.7%, Mn: 10-14%, Ti: 2.1-6%, Si: 0.3-1.0%, Ni: 0-2%, Cr: 0-2 percent of S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and the balance is Fe and some inevitable impurity elements. The TiC precipitation reinforced high manganese steel base composite material can solve the problem that the wear resistance of a high manganese steel material is insufficient under a low-impact working condition.

Description

TiC precipitation reinforced high manganese steel base composite material and preparation process thereof

Technical Field

The invention relates to the field of alloys, in particular to a TiC precipitation reinforced high manganese steel base composite material and a preparation process thereof.

Background

The high manganese steel is an important wear-resistant part material, is softer, but can be quickly hardened through deformation on the surface under the action of strong impact or large pressure stress, so that a high-hardness and high-wear-resistant surface layer is generated. The special performance of the high manganese steel enables the high manganese steel to be widely applied to various mechanical equipment for a long time, such as crusher hammers, excavator bucket teeth, railway turnouts and the like. "Elekite" is the key to the importance of high manganese steel as an important wear resistant material. However, as the industrial conditions become more complex, the drawbacks of wear-resistant manganese steels become increasingly exposed. For example, under low-impact service conditions such as a lining plate of a crusher, a rolling mortar wall and the like, the high manganese steel has reduced wear resistance, so that the service life is short, and the requirements of high-end crushing and grinding equipment cannot be met.

Disclosure of Invention

The invention provides a TiC precipitation reinforced high manganese steel base composite material, aiming at solving the problem that the wear resistance of a high manganese steel material is insufficient under a low-impact working condition.

The invention also provides a preparation process of the TiC precipitation reinforced high manganese steel base composite material, and the preparation process is simple, low in manufacturing cost and wide in application range.

The invention is realized by the following steps:

the embodiment of the invention provides a TiC precipitation reinforced high manganese steel base composite material which comprises TiC reinforcement particles, wherein the volume fraction of the TiC reinforcement particles is 3.3-14.3%, and preferably 3.3-6.3%.

The embodiment of the invention also provides a preparation process of the TiC precipitation reinforced high manganese steel-based composite material, which comprises the following steps: and mixing and melting the high manganese steel base material and the reinforcement raw material, and then casting and molding to form the TiC precipitation reinforced high manganese steel base composite material.

The invention has the beneficial effects that: the TiC reinforcement particles have high hardness and are well combined with the high manganese steel matrix interface, and the micro-cutting process during wear failure can be stopped under the low-impact working condition, so that the wear rate is reduced, the wear resistance of the TiC precipitation reinforced high manganese steel matrix composite material is improved, meanwhile, the TiC promotion improves the hardness of the high manganese steel, the volume fraction of the TiC reinforcement particles is limited, the TiC precipitation reinforced high manganese steel matrix composite material is ensured to have a multi-phase structure, and the wear resistance effect and hardness can be further ensured.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The embodiment of the invention provides a TiC precipitation reinforced high manganese steel base composite material and a preparation process thereof.

Under the action of strong impact or large pressure stress in the prior art, the high manganese steel has good wear resistance, but under the service condition of low impact, the wear resistance is poor, and although the process and the components of the high manganese steel are improved in the prior art, the inventor researches show that after the high manganese steel is improved in the prior art, the high manganese steel is still a single-phase material, the wear resistance and the hardness of the high manganese steel are improved, but the wear resistance is not obviously improved.

In view of this, an embodiment of the present invention provides a TiC precipitation-reinforced high manganese steel-based composite material, which includes TiC reinforcement particles, and the high manganese steel composite material using the TiC reinforcement particles has a two-phase structure, so that the wear resistance of the high manganese steel composite material can be improved.

The volume fraction of the TiC reinforcement particles is 3.3-14.3%, preferably 3.3-6.3%, and the volume fraction of the TiC reinforcement particles is limited to ensure that the TiC reinforcement particles are uniformly dispersed in the high manganese steel matrix, so that a multi-phase structure is formed in the composite material, the TiC reinforcement particles are further ensured to be well combined with the high manganese steel matrix, the abrasion of the high manganese steel composite material under the service condition of low impact is reduced, and the abrasion resistance of the high manganese steel composite material is improved.

Further, the TiC reinforcement particles have a particle size of 5.1-10.8 microns, more preferably 5.8 microns. The grain size of the TiC reinforcement particles is further limited, the grain size of the TiC reinforcement particles can be further improved, and the effect of improving the wear resistance of the high manganese steel matrix is guaranteed.

Further, the TiC precipitation reinforced high manganese steel-based composite material comprises the following chemical components in percentage by weight: c: 1.6-2.7%, Mn: 10-14%, Ti: 2.1-6%, Si: 0.3-1.0%, Ni: 0-2%, Cr: 0-2%, S is less than or equal to 0.03%, P is less than or equal to 0.03%, and the balance is Fe and some inevitable impurity elements; preferably, C: 1.6-2.2%, Mn: 11-13%, Ti: 2.1-4.2%, Si: 0.4-0.6%, Ni: 0.4-2%, Cr: 0.4-2%, S is less than or equal to 0.03%, P is less than or equal to 0.03%, and the balance is Fe and some inevitable impurity elements.

The proportion of the chemical compositions can ensure that the volume fraction of TiC reinforcement particles is in a required range, and can also ensure that the TiC precipitation reinforced high manganese steel-based composite material has good wear resistance under the working condition of low stamping, and the high manganese steel material has good hardness.

In the chemical composition, carbon not only can form TiC reinforcement particles to improve the wear resistance of the manganese steel composite material, but also can improve the stability of austenite and strengthen a matrix, and the carbon is the key of surface hardening of the manganese steel. The carbon content is high, the hardness of the high manganese steel is improved, the wear resistance is improved, but the brittleness of the high manganese steel composite material is increased due to the excessively high carbon content, and the use performance is further influenced, so that when the content of C is 1.6-2.7%, preferably 1.6-2.2%, the volume fraction of TiC reinforcement particles is ensured to be in a limited range, the formation of a multiphase structure is ensured, the high manganese steel composite material is ensured to have good low impact wear resistance, and meanwhile, other properties can also meet the application requirements.

Manganese stabilizes austenite. Most of manganese in the high manganese steel is dissolved in austenite in solid solution to form substitutional solid solution, so that the matrix is strengthened. The manganese content is improved, and the plasticity and the toughness of the high manganese steel are improved. However, the manganese content is too high, so that the growth of austenite dendrite in molten steel is promoted, the fluidity of the molten steel is reduced, and the defect of hot cracking casting is generated. The manganese content is low, and the work hardening performance can be improved. Therefore, the use amount of manganese is 10-14%, preferably 11-13%, which can ensure the formation of a multi-phase structure, and then ensure that the high manganese steel composite material has good shaping, thermal, fluidity and hardening properties.

The titanium can refine the cast structure and prevent the brittle fracture of the heat treatment. The dosage of the titanium is Ti: 2.1-6%, preferably Ti: 2.1-4.2%, the volume fraction of TiC reinforcement particles is ensured to be in a limited range, and not only titanium carbide can be formed to improve the work hardening capacity, but also the harm of phosphorus is counteracted.

The silicon has the function of assisting deoxidation, and in the process of casting condensation, the silicon has the function of expelling solid solution of P and S to promote segregation. When the silicon content is too high, the amount of as-cast grain boundary carbides is increased and coarsened, and after the carbides are dissolved, the grain boundaries are loosened, so that microcracks are easily formed. Therefore, the silicon content is controlled to be 0.3-1.0%, preferably 0.4-0.6%, so as to ensure the formation of a multiphase structure and further ensure the performance of the composite material.

Nickel is solid-dissolved in high manganese steel and plays an important role in the stability of austenite. The addition of nickel can inhibit the precipitation of acicular carbide and reduce the sensitivity to the cutting, electric welding and working temperature of high manganese steel. The increase of nickel content has little influence on yield strength, so that the tensile strength is reduced, the plastic forming is improved, and the work hardening speed is slowed down. Therefore, the amount of nickel used is Ni: 0-2%, preferably Ni: 0.4-2%, the effect of nickel can be ensured, and the formation of a multi-phase structure can be ensured, so that the high manganese steel composite material has good wear resistance under a low-impact working condition and excellent other properties.

Chromium and iron may form a continuous solid solution, and chromium, when dissolved in austenite, increases the yield strength of the steel, but decreases the elongation. When the chromium content is high, the tensile strength is reduced. Therefore, the use of chromium in the above range ensures the yield strength, tensile strength, and the like of the steel.

Further, the compressive yield strength of the TiC precipitation enhanced high manganese steel-based composite material is 400-;

the V-notch impact energy is 13-49J, preferably 23-43J.

Further, the high manganese steel base material comprises the following chemical components in percentage by weight: c: 1.0-1.2%, Si: 0.3-1.0%, Mn: 10-14%, Ni: 0-2%, Cr: 0-2%, S is less than or equal to 0.03%, P is less than or equal to 0.03%, and the balance is Fe and some inevitable impurity elements;

more preferably, the chemical composition of the high manganese steel base material comprises the following components in percentage by weight: c: 1.0-1.2%, Si: 0.4-0.6%, Mn: 11-13%, Ni: 0.4-2%, Cr: 0.4-2%, and the balance of Fe and some inevitable impurity elements. The content of each chemical composition in the high manganese steel matrix material is limited, the volume fraction of TiC reinforced particles is ensured, the formation of a multiphase structure is facilitated, the TiC reinforced particles are ensured to modify the matrix material, the performance of the matrix material is improved, and the high manganese steel composite material prepared by the method still has good wear resistance under the low stamping working condition.

Further, the raw materials of the reinforcement body comprise titanium-containing alloy and carbon powder;

preferably, the titanium-containing alloy is ferrotitanium, more preferably, the ferrotitanium has a purity of 65 to 75%;

preferably, the carbon powder is carbon powder with the purity of 99%. By adopting the raw materials as the raw materials of the reinforcement, the formation of TiC reinforcement particles can be ensured, and then the improvement of the wear resistance of the high manganese steel matrix material under the low stamping working condition is ensured.

Compared with the common high manganese steel, the TiC precipitation reinforced high manganese steel-based composite material provided by the embodiment of the invention has the advantages that the dry friction performance (the abrasion material is 45# steel without lubrication) is improved by 1-3 times, and the three-body abrasive abrasion performance is improved by 10-20% compared with the common high manganese steel. Meanwhile, the impact energy of the V-shaped notch of part of the composite material is more than 30J, and the composite material still has good toughness and can be used under the working condition of strong impact wear. Meanwhile, the composite material also has good hot working performance, and can be made into plates or bars through forging, hot rolling, extrusion and drawing, so that different application requirements are met.

The embodiment of the invention also provides a preparation process of the TiC precipitation reinforced high manganese steel-based composite material, which comprises the following steps:

and mixing and melting the high manganese steel base material and the reinforcement raw material, and then casting and molding to form the TiC precipitation reinforced high manganese steel base composite material. Specifically, the operation is as follows:

s1, preparing a high manganese steel base material;

mixing and melting steel, ferrosilicon, pig iron, ferromanganese, ferronickel and ferrochrome, adding a carburant, and removing slag to form the base material.

Specifically, steel, ferrosilicon and pig iron are melted to be clarified, then primary deoxidation treatment is carried out, and then the molten iron, ferromanganese and ferronickel are melted to be clarified, and then recarburization agent is added and deep deoxidation treatment is carried out. Wherein, the preliminary deoxidation treatment and the deep deoxidation treatment both comprise deoxidation by using pure aluminum, and the pure aluminum is an aluminum strip. The conditions of the primary deoxidation treatment are as follows: the mass ratio of the aluminum material to the mixed molten liquid of steel, ferrosilicon and pig iron is 1: 300-1: 500 at 1450-1520 deg.c for 8-10 min; more preferably, the conditions of the deep deoxidation treatment are: the mass ratio of the mass of the aluminum material to the mixed molten liquid of ferromanganese and ferronickel is 1: 500-1: 800 at 1460 and 1520 deg.c for 15-20 min. By adopting the conditions, the deoxidation effect can be ensured, the high manganese steel composite material can be successfully prepared, the high manganese steel composite material has good wear resistance and hardness under the low stamping working condition, and other properties of the high manganese steel composite material also meet the use requirements.

Further, the mass ratio of the steel, the ferrosilicon, the pig iron, the ferromanganese, the ferronickel and the ferrochrome is calculated according to the design components.

The steel is selected from scrap steel, the ferrosilicon selects FeSi90Al1.5, the pig iron selects 3-4% carbon, the ferromanganese selects ferromanganese with the manganese content of 70-85%, the ferronickel selects FeNi20(15% -25% Ni), the ferrochrome selects ferrochrome with the chromium content of 55-75%, the purity of the recarburizing agent is greater than 97%, and the aluminum material adopts pure aluminum. The dosage, purity and the like of the raw materials for preparing the high manganese steel matrix material are limited, the good effect of the prepared high manganese steel matrix material and TiC reinforcement particles can be ensured, and the performance of the high manganese steel composite material is further ensured.

It should be noted that, because the steel material is selected from the waste steel material, the internal chemical components or impurities may not meet the requirements, so the waste steel material is firstly treated, heated and melted, the impurities are removed, or the chemical component ratio is adjusted. This operation is conventional in the art and the inventors do not go to any further detail.

Further, the temperature of the whole melting process for preparing the high manganese steel base material is 1390-.

S2, preparing a TiC precipitation reinforced high manganese steel base composite material;

adding the reinforcement raw material containing titanium alloy and carbon powder into the high manganese steel base material formed by mixing and melting in S1 for mixing and melting, wherein the temperature of mixing and melting is 1390-. By adopting the conditions, the formation of TiC reinforcement particles can be ensured, and the improvement of the wear resistance of the high manganese steel matrix material under low stamping is further ensured.

Further, after the reinforcement raw material and the high manganese steel base material are fully mixed and stirred, the molten liquid obtained after melting is rapidly taken out of the furnace and poured into a casting ladle, and the molten liquid is poured into a casting mold for casting forming after standing, so that an as-cast steel piece is obtained; and after the pouring is finished, boxing and taking out the casting, cooling, cleaning sand, polishing and the like, and performing water toughening treatment to obtain the novel high manganese steel base wear-resistant composite material. Wherein the casting temperature is 1390-. By adopting the operating conditions, the formation of the TiC precipitation reinforced high manganese steel-based composite material can be ensured, and the performance of the composite material is ensured.

The TiC precipitation-enhanced high manganese steel-based composite material and the preparation process thereof provided by the invention are specifically described below with reference to specific embodiments.

Example 1

This example provides a TiC precipitation-reinforced high manganese steel-based composite material, which includes TiC reinforcement particles, the volume fraction of the TiC particles is about 3.5%, and the average particle size is 7.8 μm.

The chemical composition of the TiC precipitation reinforced high manganese steel base composite material is as follows: c: 1.9%, Ti: 2.1%, Si: 0.6%, Mn: 12%, Ni: 1%, Cr: 1 percent of S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and the balance is Fe and inevitable impurity elements.

The raw materials of the TiC precipitation reinforced high manganese steel base composite material comprise a high manganese steel base material and a reinforcement raw material, wherein the mass ratio of the high manganese steel base material to the reinforcement raw material is 100: 2.1; the high manganese steel base material comprises the following chemical components in percentage by weight: c: 1.2%, Si: 0.6%, Mn: 12%, Ni: 1%, Cr: 1 percent, in addition, the S is less than or equal to 0.03 percent, the P is less than or equal to 0.03 percent, and the balance is Fe and some inevitable impurity elements; the raw materials of the reinforcement body comprise ferrotitanium and carbon powder, the mass ratio of the ferrotitanium to the carbon powder is 4:1, the purity of the ferrotitanium is 99 percent, and the purity of the carbon powder is 99 percent.

The embodiment provides a preparation process of the TiC precipitation-reinforced high manganese steel-based composite material, which comprises the following steps:

s1, preparing a high manganese steel base material;

calculating and weighing the raw materials required by the smelting: steel, ferrosilicon, pig iron, ferromanganese, ferrochromium, ferronickel and carburant.

The steel is selected from scrap steel, the ferrosilicon is selected from FeSi90Al1.5, the pig iron is selected from 3-4% of carbon, the ferromanganese is selected from ferromanganese with the manganese content of 70-85%, the ferronickel is selected from FeNi20(15% -25% Ni), the ferrochrome is selected from ferrochrome with the chromium content of 55-75%, the purity of the recarburizing agent is greater than 97%, and the mass ratio of the ferrosilicon, the pig iron, the ferromanganese, the ferronickel, the ferrochrome and the recarburizing agent is calculated according to design components.

Heating steel in an electric furnace to 1410 ℃ for melting, pretreating, then melting the steel, ferrosilicon and pig iron to be clarified, carrying out primary deoxidation treatment, then melting the molten steel, the ferrosilicon and the ferromanganese to be clarified, then adding a carburant, and carrying out deep deoxidation treatment. Wherein, the preliminary deoxidation treatment and the deep deoxidation treatment both comprise deoxidation by using pure aluminum, and the aluminum material is an aluminum strip. And the conditions of the primary deoxidation treatment are as follows: the addition amount of the aluminum material is 1: 500 at 1500 deg.c for 10 min. The conditions of the deep deoxidation treatment are as follows: the mass ratio of the mass of the aluminum material to the mixed molten liquid of ferromanganese and ferronickel is 1: 800 at 1500 deg.C for 20 min.

ferrotitanium powder and carbon powder are mixed and then made into blocks, wherein the mass ratio of the ferrotitanium powder to the carbon powder is 2:1, the purity of the ferrotitanium is 99 percent, and the carbon powder is 99 percent.

Adding the block materials into the melt obtained by melting, adding the block materials into the melt, melting to be clear, wherein the temperature of mixed melting is 1550 ℃, then rapidly discharging the block materials out of the furnace and pouring the block materials into a casting ladle, controlling the temperature of the melt in the ladle at 1550 ℃, standing for a period of time to reduce the temperature of the melt to 1440 ℃, pouring the melt into a casting mold for casting and forming to obtain an as-cast steel part; and (5) after the pouring is finished for 10 hours, boxing and taking out the casting.

And then cooling, sand removing, polishing and the like are carried out, and water toughening treatment is carried out to obtain the novel high manganese steel base wear-resistant composite material. The temperature of the water toughening treatment is 1050 ℃.

Example 2

This example provides a TiC precipitation-reinforced high manganese steel-based composite material, which includes TiC reinforcement particles, the volume fraction of the TiC particles is about 6.3%, and the average particle size is 10.8 μm.

The chemical composition of the TiC precipitation reinforced high manganese steel base composite material is as follows: c: 2.2%, Ti: 4.2%, Si: 0.4%, Mn: 12%, Ni: 1.9%, Cr: 1.9 percent of S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and the balance of Fe and inevitable impurity elements.

The raw materials of the TiC precipitation reinforced high manganese steel base composite material comprise a high manganese steel base material and a reinforcement raw material, wherein the mass ratio of the high manganese steel base material to the reinforcement raw material is 100: 3.8; the high manganese steel base material comprises the following chemical components in percentage by weight: c: 1.0%, Si: 0.4%, Mn: 12%, Ni: 1.9%, Cr: 1.9 percent, in addition, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, and the balance of Fe and some inevitable impurity elements; the raw materials of the reinforcement body comprise ferrotitanium and carbon powder, the mass ratio of the ferrotitanium to the carbon powder is 4:1, the purity of the ferrotitanium is 99 percent, and the purity of the carbon powder is 99 percent.

s1, preparing a high manganese steel base material;

Heating steel in an electric furnace to 1450 ℃ for melting, carrying out pretreatment, then melting the steel, ferrosilicon and pig iron to clarify, carrying out primary deoxidation treatment, then melting the steel, ferrosilicon and ferromanganese to clarify, then adding a carburant and carrying out deep deoxidation treatment. Wherein, the preliminary deoxidation treatment and the deep deoxidation treatment both comprise deoxidation by using pure aluminum, and the aluminum material is an aluminum strip. The conditions of the primary deoxidation treatment are as follows: the mass ratio of the aluminum material to the mixed molten liquid of steel, ferrosilicon and pig iron is 1: 450 at 1490 ℃ for 8 minutes; the conditions of the deep deoxidation treatment are as follows: the mass ratio of the mass of the aluminum material to the mixed molten liquid of ferromanganese and ferronickel is 1: 500 at 1520 ℃ for 20 minutes.

Adding the block materials into the molten liquid obtained by melting, melting until the mixture is clear, wherein the temperature of the mixed melting is 1530 ℃, then rapidly discharging the molten liquid from the furnace and pouring the molten liquid into a casting ladle, controlling the temperature of the molten liquid in the ladle at 1530 ℃, standing for a period of time to reduce the temperature of the molten liquid to 1490 ℃, pouring the molten liquid into a casting mold for casting and forming, and obtaining an as-cast steel; and (5) after the pouring is finished for 10 hours, boxing and taking out the casting.

And then cooling, sand removing, polishing and the like are carried out, and water toughening treatment is carried out to obtain the novel high manganese steel base wear-resistant composite material. The temperature of the water toughening treatment is 950 ℃.

Example 3

This example provides a TiC precipitation-reinforced high manganese steel-based composite material, which includes TiC reinforcement particles, the volume fraction of the TiC particles is about 3.3%, and the average particle size is 5.8 μm.

The chemical composition of the TiC precipitation reinforced high manganese steel base composite material is as follows: c: 1.6%, Ti: 2.0%, Si: 0.6%, Mn: 14%, Ni: 2.0%, Cr: 2.0 percent of S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and the balance is Fe and inevitable impurity elements.

The raw materials of the TiC precipitation reinforced high manganese steel base composite material comprise a high manganese steel base material and a reinforcement raw material, wherein the mass ratio of the high manganese steel base material to the reinforcement raw material is 100: 2.0; the high manganese steel base material comprises the following chemical components in percentage by weight: c: 1.1%, Si: 0.6%, Mn: 14%, Ni: 2.0%, Cr: 2.0 percent of the total weight of the alloy, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, and the balance of Fe and some inevitable impurity elements; the raw materials of the reinforcement body comprise ferrotitanium and carbon powder, the mass ratio of the ferrotitanium to the carbon powder is 4:1, the purity of the ferrotitanium is 99 percent, and the purity of the carbon powder is 99 percent.

s1, preparing a high manganese steel base material;

Heating steel in an electric furnace to 1480 ℃ for melting and pretreatment, then melting the steel, ferrosilicon and pig iron to be clarified, then carrying out primary deoxidation treatment, then melting the steel, ferrosilicon and ferronickel to be clarified, and then adding a carburant and carrying out deep deoxidation treatment. Wherein, the preliminary deoxidation treatment and the deep deoxidation treatment both comprise deoxidation by using pure aluminum, and the aluminum material is an aluminum strip. The conditions of the primary deoxidation treatment are as follows: the mass ratio of the aluminum material to the mixed molten liquid of steel, ferrosilicon and pig iron is 1: 500 at 1500 ℃ for 9 minutes; the conditions of the deep deoxidation treatment are as follows: the mass ratio of the mass of the aluminum material to the mixed molten liquid of ferromanganese and ferronickel is 1: 500 at 1480 ℃ for 15 minutes.

Adding the block materials into the melt obtained by melting, adding the block materials into the melt until the mixture is clear, wherein the temperature of the mixture and the melt is 1550 ℃, then quickly discharging the block materials out of the furnace and pouring the block materials into a casting ladle, controlling the temperature of the melt in the ladle at 1550 ℃, standing the block materials for a period of time to reduce the temperature of the melt to 1400 ℃, pouring the melt into a casting mold for casting and forming, and obtaining an as-cast heat-resistant steel piece; and (5) after the pouring is finished for 10 hours, boxing and taking out the casting.

And then cooling, sand removing, polishing and the like are carried out, and water toughening treatment is carried out to obtain the novel high manganese steel base wear-resistant composite material. The temperature of the water toughening treatment is 1000 ℃.

Example 4

This example provides a TiC precipitation-reinforced high manganese steel-based composite material comprising TiC reinforcement particles, the volume fraction of the TiC particles being about 14.3%, and the average particle size being 9.8 μm.

The chemical composition of the TiC precipitation reinforced high manganese steel base composite material is C: 2.7%, Ti: 6.0%, Si: 0.3%, Mn: 10%, Ni: 0%, Cr: 0 percent of S, less than or equal to 0.03 percent of P, and the balance of Fe and inevitable impurity elements.

The raw materials of the TiC precipitation reinforced high manganese steel base composite material comprise a high manganese steel base material and a reinforcement raw material, wherein the mass ratio of the high manganese steel base material to the reinforcement raw material is 100: 8.5. the high manganese steel base material comprises the following chemical components in percentage by weight: c: 1.2%, Si: 0.3%, Mn: 10%, Ni: 0%, Cr: 0 percent, in addition, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, and the balance of Fe and some inevitable impurity elements.

The embodiment provides a preparation process of the TiC precipitation reinforced high manganese steel-based composite material, which comprises the following steps:

s1, preparing a high manganese steel base material;

Melting steel, ferrosilicon and pig iron to be clarified, then carrying out primary deoxidation treatment, then melting the molten steel, the ferrosilicon and the pig iron to be clarified, then adding a carburant and carrying out deep deoxidation treatment. Wherein, the preliminary deoxidation treatment and the deep deoxidation treatment both comprise deoxidation by using pure aluminum, and the aluminum material is an aluminum strip. The conditions of the primary deoxidation treatment are as follows: the mass ratio of the aluminum material to the mixed molten liquid of steel, ferrosilicon and pig iron is 1: 300 at 1450 ℃ for 9 minutes; the conditions of the deep deoxidation treatment are as follows: the mass ratio of the mass of the aluminum material to the mixed molten liquid of ferromanganese and ferronickel is 1: 500 at 1480 ℃ for 18 minutes.

ferrotitanium powder and carbon powder are mixed and then made into blocks, wherein the mass ratio of the ferrotitanium powder to the carbon powder is 4:1, the purity of the ferrotitanium is 99 percent, and the carbon powder is 99 percent.

Adding the block materials into the molten liquid obtained by melting, melting to be clarified, wherein the temperature of mixed melting is 1550 ℃, then rapidly discharging the molten liquid from a furnace and pouring the molten liquid into a casting ladle, controlling the temperature of the molten liquid in the ladle at 1550 ℃, standing for a period of time to reduce the temperature of the molten liquid to 1540 ℃, pouring the molten liquid into a casting mold and casting to form, thus obtaining the as-cast heat-resistant steel piece; and (5) after the pouring is finished for 10 hours, boxing and taking out the casting.

And then cooling, sand removing, polishing and the like are carried out, and water toughening treatment is carried out to obtain the novel high manganese steel base wear-resistant composite material. The temperature of the water toughening treatment is 1020 ℃.

Example 5

The embodiment provides a TiC precipitation reinforced high manganese steel-based composite material, which comprises TiC reinforcement particles, wherein the volume fraction of the TiC particles is about 4.1%, and the average particle size is 5.1 mu m.

The chemical composition of the TiC precipitation reinforced high manganese steel base composite material is C: 1.6%, Ti: 2.2%, Si: 0.5%, Mn: 11%, Ni: 1.6%, Cr: 1.6 percent of S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and the balance of Fe and inevitable impurity elements.

The raw materials of the TiC precipitation reinforced high manganese steel base composite material comprise a high manganese steel base material and a reinforcement raw material, wherein the mass ratio of the high manganese steel base material to the reinforcement raw material is 100: 2.5; the high manganese steel base material comprises the following chemical components in percentage by weight: c: 1.0%, Si: 0.5%, Mn: 11%, Ni: 1.6%, Cr: 1.6 percent, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, and the balance of Fe and some inevitable impurity elements; the raw materials of the reinforcement body comprise ferrotitanium and carbon powder, the mass ratio of the ferrotitanium to the carbon powder is 2:1, the purity of the ferrotitanium is 99 percent, and the purity of the carbon powder is 99 percent.

s1, preparing a high manganese steel base material;

Heating steel in an electric furnace to 1480 ℃ for melting pretreatment, then melting the steel, ferrosilicon and pig iron to be clarified, then carrying out primary deoxidation treatment, then melting the steel, ferrosilicon and ferronickel to be clarified, then adding a carburant and carrying out deep deoxidation treatment. Wherein, the preliminary deoxidation treatment and the deep deoxidation treatment both comprise deoxidation by using pure aluminum, and the aluminum material is an aluminum strip. The conditions of the primary deoxidation treatment are as follows: the mass ratio of the aluminum material to the mixed molten liquid of steel, ferrosilicon and pig iron is 1: 390 at 1500 deg.C for 10 min; the conditions of the deep deoxidation treatment are as follows: the mass ratio of the mass of the aluminum material to the mixed molten liquid of ferromanganese and ferronickel is 1: 600 at 1480 ℃ for 15 minutes.

Adding the block materials into the molten liquid obtained by melting, melting until the molten liquid is clear, wherein the mixed melting temperature is 1490 ℃, then rapidly discharging the molten liquid from a furnace and pouring the molten liquid into a casting ladle, controlling the temperature of the molten liquid in the ladle at 1500 ℃, standing for a period of time to reduce the temperature of the molten liquid to 1450 ℃, pouring the molten liquid into a casting mold for casting and forming, and obtaining an as-cast heat-resistant steel piece; and (5) after the pouring is finished for 10 hours, boxing and taking out the casting.

And then cooling, sand removing, polishing and the like are carried out, and water toughening treatment is carried out to obtain the novel high manganese steel base wear-resistant composite material. The temperature of the water toughening treatment is 1030 ℃.

Example 6

The embodiment provides a TiC precipitation reinforced high manganese steel-based composite material, which comprises TiC reinforcement particles, wherein the volume fraction of the TiC particles is about 12%, and the average particle size is 8.8 mu m.

The chemical composition of the TiC precipitation reinforced high manganese steel base composite material is C: 2.3%, Ti: 4.8%, Si: 0.5%, Mn: 14%, Ni: 2.0%, Cr: 2.0 percent of S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and the balance is Fe and inevitable impurity elements.

The raw materials of the TiC precipitation reinforced high manganese steel base composite material comprise a high manganese steel base material and a reinforcement raw material, wherein the mass ratio of the high manganese steel base material to the reinforcement raw material is 100: 7.2; the high manganese steel base material comprises the following chemical components in percentage by weight: c: 1.1%, Si: 0.5%, Mn: 14%, Ni: 2.0%, Cr: 2.0 percent of the total weight of the alloy, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, and the balance of Fe and some inevitable impurity elements; the raw materials of the reinforcement body comprise ferrotitanium and carbon powder, the mass ratio of the ferrotitanium to the carbon powder is 2:1, the purity of the ferrotitanium is 99 percent, and the purity of the carbon powder is 99 percent.

Heating steel in an electric furnace to 1410 ℃ for melting pretreatment, then melting the steel, ferrosilicon and pig iron to be clarified, carrying out primary deoxidation treatment, then melting the steel, ferrosilicon and ferromanganese to be clarified, then adding a carburant and carrying out deep deoxidation treatment. Wherein, the preliminary deoxidation treatment and the deep deoxidation treatment both comprise deoxidation by using pure aluminum, and the aluminum material is an aluminum strip. The conditions of the primary deoxidation treatment are as follows: the mass ratio of the aluminum material to the mixed molten liquid of steel, ferrosilicon and pig iron is 1: 500 at 1510 ℃ for 8 minutes; the conditions of the deep deoxidation treatment are as follows: the mass ratio of the mass of the aluminum material to the mixed molten liquid of ferromanganese and ferronickel is 1: 700 at 1480 ℃ for 15 minutes.

Adding the block materials into the melt obtained by melting, melting to be clear, wherein the temperature of mixed melting is 1520 ℃, then rapidly discharging from a furnace and pouring into a casting ladle, controlling the temperature of the melt in the ladle at 1550 ℃, standing for a period of time to reduce the temperature of the melt to 1460 ℃, pouring the melt into a casting mold for casting and forming, and obtaining an as-cast heat-resistant steel piece; and (5) after the pouring is finished for 10 hours, boxing and taking out the casting.

Example 7

The embodiment provides a TiC precipitation reinforced high manganese steel-based composite material, which comprises TiC reinforcement particles, wherein the volume fraction of the TiC particles is about 10%, and the average particle size is 6.9 mu m.

The chemical composition of the TiC precipitation reinforced high manganese steel base composite material is C: 2.2%, Ti: 4.0%, Si: 0.7%, Mn: 12%, Ni: 1.5%, Cr: 1.5 percent of S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and the balance of Fe and inevitable impurity elements.

The raw materials of the TiC precipitation reinforced high manganese steel base composite material comprise a high manganese steel base material and a reinforcement raw material, wherein the mass ratio of the high manganese steel base material to the reinforcement raw material is 100: 6; the high manganese steel base material comprises the following chemical components in percentage by weight: c: 1.2%, Si: 0.7%, Mn: 12%, Ni: 1.5%, Cr: 1.5 percent, in addition, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, and the balance of Fe and some inevitable impurity elements; the raw materials of the reinforcement body comprise ferrotitanium and carbon powder, the mass ratio of the ferrotitanium to the carbon powder is 2:1, the purity of the ferrotitanium is 99 percent, and the purity of the carbon powder is 99 percent.

s1, preparing a high manganese steel base material;

Heating steel in an electric furnace to 1450 ℃ for melting pretreatment, then melting the steel, ferrosilicon and pig iron to clarify, then adding a carburant and performing deep deoxidation treatment. Wherein, the preliminary deoxidation treatment and the deep deoxidation treatment both comprise deoxidation by using pure aluminum, and the aluminum material is an aluminum strip. The conditions of the primary deoxidation treatment are as follows: the mass ratio of the aluminum material to the mixed molten liquid of steel, ferrosilicon and pig iron is 1: 450 at 1500 ℃ for 9 minutes; the conditions of the deep deoxidation treatment are as follows: the mass ratio of the mass of the aluminum material to the mixed molten liquid of ferromanganese and ferronickel is 1: 800 at 1500 deg.C for 15 min.

Adding the block materials into the melt obtained by melting, adding the block materials into the melt until the mixture is clear, wherein the temperature of the mixture and the melt is 1500 ℃, then quickly discharging the mixture out of the furnace and pouring the mixture into a casting ladle, controlling the temperature of the melt in the ladle at 1550 ℃, standing the mixture for a period of time to reduce the temperature of the melt to 1490 ℃, pouring the melt into a casting mold for casting and forming, and obtaining an as-cast heat-resistant steel piece; and (5) after the pouring is finished for 10 hours, boxing and taking out the casting.

And then cooling, sand removing, polishing and the like are carried out, and water toughening treatment is carried out to obtain the novel high manganese steel base wear-resistant composite material. The temperature of the water toughening treatment is 1040 ℃.

Comparative example 1: example 1 the resulting high manganese steel base material was prepared.

Comparative example 2: referring to the preparation process of the TiC precipitation-reinforced high manganese steel-based composite material provided in example 1, the TiC precipitation-reinforced high manganese steel-based composite material is prepared, and the raw material selection is the same, except that the volume fraction of TiC reinforcement particles in the TiC precipitation-reinforced high manganese steel-based composite material is 0.4%, and the chemical composition of the TiC precipitation-reinforced high manganese steel-based composite material is C: 1.3%, Ti: 0.8%, Si: 0.3%, Mn: 13%, Ni: 1%, Cr: 1 percent of S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and the balance is Fe and inevitable impurity elements.

Comparative example 3: the TiC precipitation-reinforced high manganese steel-based composite material is prepared by referring to the preparation process of the TiC precipitation-reinforced high manganese steel-based composite material provided in the embodiment 1, the raw material selection is the same, and the difference is that the volume fraction of TiC reinforcement particles in the TiC precipitation-reinforced high manganese steel-based composite material is 25%; the chemical composition of the TiC precipitation reinforced high manganese steel base composite material is C: 3.7%, Ti: 10%, Si: 0.8%, Mn: 13%, Ni: 1%, Cr: 1 percent of S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and the balance is Fe and inevitable impurity elements.

The TiC precipitation enhanced high manganese steel-based composite materials prepared in examples 1-7 and comparative examples 1-3 are tested, wherein the compression yield strength is tested by using GB/T7314-2017, the V-notch impact energy is tested by using GB/T229-1994, the wear rate is tested by using three-body wear test, no-lubrication and 100N force-applied opposite grinding and no-lubrication and 300N force-applied opposite grinding, and the test results are shown in Table 1.

TABLE 1 test results

According to table 1, the TiC precipitation reinforced high manganese steel-based composite material provided by the embodiment of the invention has the advantages that the wear performance of the three-body abrasive is improved by 10-20% compared with that of common high manganese steel, the dry friction performance (45 # steel as a grinding material without lubrication) is obviously improved, and the wear resistance under the low-impact working condition is obviously improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The TiC precipitation reinforced high manganese steel base composite material is characterized by comprising TiC reinforcement particles, wherein the volume fraction of the TiC reinforcement particles is 3.3-14.3%, and the TiC precipitation reinforced high manganese steel base composite material comprises the following chemical components in percentage by weight: c: 1.6-2.2%, Mn: 11-13%, Ti: 2.1-4.2%, Si: 0.4-0.6%, Ni: 0.4-2%, Cr: 0.4-2%, S is less than or equal to 0.03%, P is less than or equal to 0.03%, and the balance is Fe and some inevitable impurity elements, wherein the TiC precipitation reinforced high manganese steel base composite material has a two-phase structure.

2. The TiC precipitation-reinforced high manganese steel-based composite material according to claim 1, wherein the volume fraction of TiC reinforcement particles is 3.3-6.3%.

3. The TiC precipitation-reinforced high manganese steel-based composite material according to claim 1, wherein the grain size of said TiC reinforcement particles is 5.1-10.8 μm.

4. The TiC precipitation-reinforced high manganese steel-based composite material according to claim 1, wherein the grain size of said TiC reinforcement particles is 5.8 μm.

5. The TiC precipitation-reinforced high manganese steel-based composite material as claimed in claim 1, wherein the compressive yield strength of the TiC precipitation-reinforced high manganese steel-based composite material is 400-530MPa;

the impact energy of the V-shaped notch is 13-49J.

6. The TiC precipitation-reinforced high-manganese steel-based composite material as claimed in claim 5, wherein the compressive yield strength of the TiC precipitation-reinforced high-manganese steel-based composite material is 400-453MPa, and the impact energy of a V-shaped notch is 23-49J.

7. The TiC precipitation-reinforced high manganese steel-based composite material of claim 1, wherein the raw materials of the TiC precipitation-reinforced high manganese steel-based composite material comprise a high manganese steel base material and a reinforcement raw material.

8. The TiC precipitation-reinforced high manganese steel-based composite material of claim 7, wherein the chemical composition of the high manganese steel matrix material comprises, in weight percent: c: 1.0-1.2%, Si: 0.3-1.0%, Mn: 10-14%, Ni: 0-2%, Cr: 0-2%, S is less than or equal to 0.03%, P is less than or equal to 0.03%, and the balance is Fe and some inevitable impurity elements.

9. The precipitation-strengthened high-manganese steel-based composite material as claimed in claim 7, wherein the high-manganese steel base material comprises the following chemical components in percentage by weight: c: 1.0-1.2%, Si: 0.4-0.6%, Mn: 11-13%, Ni: 0.4-2%, Cr: 0.4-2%, S is less than or equal to 0.03%, P is less than or equal to 0.03%, and the balance is Fe and some inevitable impurity elements.

10. The TiC precipitation-reinforced high manganese steel-based composite material of claim 7, wherein the mass ratio of the high manganese steel matrix material to the reinforcement raw material is 100: 2.0-8.5.

11. A TiC precipitation-reinforced high manganese steel-based composite material according to claim 7, wherein said reinforcement raw material comprises titanium-containing alloy and carbon powder.

12. A TiC precipitation reinforced high manganese steel-based composite material according to claim 11, wherein the titanium containing alloy is ferrotitanium, the purity of which is 65-75%.

13. The TiC precipitation reinforced high manganese steel-based composite material according to claim 11, wherein said carbon powder is carbon powder with a purity of 99%.

14. The TiC precipitation reinforced high manganese steel-based composite material according to claim 11, wherein the mass ratio of titanium-containing alloy to carbon powder is 2-4: 1.

15. A process for the preparation of a TiC precipitation reinforced high manganese steel based composite material according to any of claims 1 to 14, comprising the steps of: mixing and melting a high manganese steel base material and a reinforcement raw material, and then casting and molding to form the TiC precipitation reinforced high manganese steel base composite material;

wherein, the preparation of the high manganese steel base material comprises the following steps: mixing and melting steel, ferrosilicon, pig iron, ferromanganese, ferronickel and ferrochrome, adding a carburant, and removing slag to form the base material;

the mixed melting for preparing the high manganese steel base material comprises the following steps: melting steel, ferrosilicon and pig iron to be clarified, then carrying out primary deoxidation treatment, then melting the molten steel, ferromanganese and ferronickel to be clarified, then adding a carburant, carrying out deep deoxidation, then adding the carburant, and removing slag to form the base material;

the preliminary deoxidation treatment and the deep deoxidation treatment both comprise deoxidation by using pure aluminum, wherein the pure aluminum is an aluminum strip;

the conditions of the primary deoxidation treatment are as follows: the mass ratio of the aluminum material to the mixed molten liquid of steel, ferrosilicon and pig iron is 1: 300-1: 500 at 1450-1520 deg.c for 8-10 min;

the conditions of the deep deoxidation treatment are as follows: the mass ratio of the mass of the aluminum material to the mixed molten liquid of ferromanganese and ferronickel is 1: 500-1: 800 at 1460 and 1520 deg.c for 15-20 min;

the steel is selected from scrap steel, the ferrosilicon is FeSi90Al1.5, the pig iron is selected from 3-4% of carbon, the ferromanganese is ferromanganese with the manganese content of 70-85%, the ferronickel is FeNi20 (15-25% Ni), the ferrochrome is ferrochrome with the chromium content of 55-75%, and the purity of the recarburizing agent is more than 97%;

the mixing and melting temperature for preparing the high manganese steel base material and the mixing and melting temperature of the high manganese steel base material and the reinforcement raw material are 1390-;

casting and molding, and then carrying out water toughening treatment at 950-1150 ℃.