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CN115890061A - TiC and VC reinforced laser surfacing layer and preparation method thereof - Google Patents

TiC and VC reinforced laser surfacing layer and preparation method thereof Download PDF

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Publication number
CN115890061A
CN115890061A CN202211690051.2A CN202211690051A CN115890061A CN 115890061 A CN115890061 A CN 115890061A CN 202211690051 A CN202211690051 A CN 202211690051A CN 115890061 A CN115890061 A CN 115890061A
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percent
tic
flux
weld overlay
surfacing layer
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李洁
王昕�
苏成明
曹鹏
刘文博
张飘飘
王彦涛
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Xi'an Intelligent Remanufacturing Research Institute Co ltd
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Xi'an Intelligent Remanufacturing Research Institute Co ltd
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Abstract

The invention discloses a TiC and VC reinforced laser surfacing layer and a preparation method thereof, wherein the component design is based on the dependency relationship of material-structure-performance, the final purpose is to form a martensite structure as a target structure, and the final purpose is to achieve the high-hardness corrosion-resistant target of the surfacing layer on an upright post by means of solid solution reinforcement and carbide reinforcement by means of a Fe-Cr-C-Mo-V-Ti alloy system. The characteristics of uniform texture of the wire laser surfacing layer, high bonding degree of the reinforcing phase and the surfacing layer matrix in an interface, more stable interface thermodynamics and the like are achieved.

Description

TiC and VC reinforced laser surfacing layer and preparation method thereof
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a TiC and VC reinforced laser surfacing layer and a preparation method thereof.
Background
The primary modes of failure of ferrous materials can be summarized as fracture, wear and corrosion. With the rapid improvement of the industrialization level and the rapid development of the scientific technology, the working condition environment of the service of the mechanical parts is increasingly complex and harsh, so that the situations of repairing and even scrapping the materials due to abrasion and corrosion are greatly increased, and the method is particularly serious in the industries of metallurgy, building materials, coal, electric power, mines and the like. According to statistics, the structure consumed by industrialized countries for corrosion failure accounts for 60%, so that the development of research on wear resistance and corrosion resistance has important theoretical significance and engineering practical value.
For the prepared structure, an effective way for improving the wear resistance and the corrosion resistance of the structure is to carry out surface modification treatment on the structure. In the aspect of material surface modification, the economy and the rapid development of a surfacing process are important branches in the technical field of welding. This process is increasingly used in the repair of industrial parts. The service life of the part or equipment is prolonged by surfacing a layer of metal alloy with special performance and meeting the use condition of the part on the surface of the equipment part.
The coal mine hydraulic support upright post is in an underground environment for a long time, the service working condition is severe, and the service environment has H 2 S corrosion and other multi-corrosion media exist, and various high-hardness particles exist, so that the performance of a surfacing layer on the surface of the part needs to be corrosion-resistant and high-hardness, but in the surface repair process of the part by the existing laser cladding, the prepared coating is difficult to meet the performance requirement of the stand column of the hydraulic support in the coal mine due to single components of the welding wire. Meanwhile, in the laser cladding process, due to the absence of the electric arc stirring effect, the formed molten pool cannot be fully stirred, and elements of the molten pool are distributedThe welding method has the advantages that the welding method is not uniform, the composition segregation is easily caused in the solidification process, the phenomena of nonuniform microstructure and the like are shown, and the performance of the overlaying layer is further influenced. Therefore, for wire laser cladding, the problems of promoting uniform mixing of elements in a molten pool, homogenizing a solidified wire laser surfacing layer and exerting the potential of wire laser cladding to the maximum extent need to be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a TiC and VC reinforced laser surfacing layer and a preparation method thereof, so as to solve the problems that the surfacing layer in the prior art is easy to have composition segregation, uneven microstructure and the like in the preparation process.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a TiC and VC enhanced laser weld overlay, the composition of which comprises, in mass fraction: c:0.14-0.17%; si:0.42 to 0.58 percent; mn:0.78-1.39%; cr:18.50-19.80%; ni:0.65-1.58%; mo:0.43 to 1.32 percent; v:0.11 to 0.28 percent; ti:0.10-0.32%; the balance being iron; the surfacing layer contains hard phases of TiC and VC.
The invention is further improved in that:
preferably, the hardness of the overlaying layer is HRC50-53.
Preferably, the time of resisting neutral salt spray corrosion of the overlaying layer is more than or equal to 500 hours.
According to the preparation method of the TiC and VC reinforced laser surfacing layer, the surfacing layer is prepared by a flux-cored wire through laser cladding; the flux-cored wire comprises a flux core and a welding skin, wherein the flux core is wrapped by the welding skin, and the flux core is arranged along the length direction of the welding skin;
the flux core is metal mixed powder, and the composition of the flux core changes along with the change of the composition of the welding skin.
Preferably, the mass ratio of the flux core in the flux-cored wire is 30wt.% to 32wt.%.
Preferably, the diameter of the flux-cored wire is 1.0mm-1.2mm.
Preferably, the flux-cored wire is manufactured by drawing.
Preferably, when the welding skin is a 430 stainless steel strip, the composition of the flux core is as follows: si:1.00 to 1.50 percent; mn:2.00-4.00%; cr:26.00-30.00%; ni:2.00-5.00%; mo:2.00-5.00%; VC:0.50-1.50%; tiC:0.50-1.50%; the balance being Fe.
Preferably, when the weld skin is a 410 stainless steel band, the composition of the flux core is as follows: si:0.86-1.36%; mn:2.00-4.00%;
cr:36.20 to 40.20 percent; ni:2.25 to 5.25 percent; mo:2.00-5.00%; VC:0.50-1.50%; tiC:0.50-1.50%; the balance being Fe.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a TiC and VC reinforced laser surfacing layer, wherein the composition design of the surfacing layer is based on the material-structure-performance dependency relationship, the final purpose is to form a martensite structure as a target structure, and the final purpose is to achieve the high-hardness and corrosion-resistant target of the surfacing layer on an upright post by means of a Fe-Cr-C-Mo-V-Ti alloy system through solid solution reinforcement and carbide reinforcement. The characteristics of uniform texture of the wire laser surfacing layer, high bonding degree of the reinforcing phase and the surfacing layer matrix in an interface, more stable interface thermodynamics and the like are achieved.
Furthermore, a welding wire is melted through laser cladding to form a martensitic stainless steel overlaying layer on a coal mine hydraulic support column, the surface hardness of a functional coating prepared by the wire through laser cladding can reach 50-53HRC, the material has excellent neutral environment corrosion resistance, and the corrosion rating of the surface of the material after 500-hour corrosion can reach the highest grade of above 9 according to the rating of a sample and a test piece after the corrosion test of metal and other inorganic covering layers on a GBT6461 metal matrix under the condition of GBT10125 artificial atmosphere corrosion test salt mist test.
The invention discloses a preparation method of a TiC and VC reinforced laser overlaying layer. This build-up layer realizes preparing through silk material laser equipment, is used for the laser cladding of silk material promptly specially, realizes realizing the high rigidity of build-up layer: the TiC and VC hard phases have high hardness, after the TiC and VC hard phases are added into the powder, a part of the TiC and VC hard phases are decomposed into V, C and Ti elements in the laser cladding process, solid solution strengthening of a matrix is realized, a part of TiC and VC hard phases exist in the matrix in situ to form a heterogeneous nucleation core, and the prior austenite grains are refined. The hard phase has the function of pinning dislocation in the subsequent deformation process, and the excellent corrosion resistance of the surfacing layer is realized by adding Cr element and matching Mo and Ni element in the components. The performance of the overlaying layer can be adjusted by different proportions of the powder.
Furthermore, the powder with the designed components is placed in the welding skin made of metal materials, and a solid welding wire in the traditional laser cladding using process is replaced, so that less slag and less spraying are generated in the laser cladding process, and the powder flux core under the laser action is easier to melt, the fluidity of a molten pool is good, less smoke is generated, and finally formed coating components are easy to reach target components and generate target metallographic components. The metal flux-cored wire formula is mainly used for modifying the surface of a part, SO that the generated coating has excellent corrosion resistance (SO resistance) 2 、H 2 S, etc.) and high hardness (HRC 50-53 HRC). The final components of the flux-cored wire are realized by the steel belt and the powder, and the powder formula is easy to obtain, so that compared with the traditional solid wire for producing steel products needing to be smelted, the period is short, the effect is fast, and the cost is low. The method solves the problems that after a surfacing layer on the surface of a coal mine hydraulic support stand column is prepared by laser cladding in the prior art, in order to achieve the combination of hardness and corrosion resistance, the high content of high-melting-point elements causes poor fluidity of a molten pool, the surfacing layer is easy to generate segregation, the performance of the whole surfacing layer is reduced, the industrialized requirements of wire laser cladding are difficult to meet, and the like.
Furthermore, the powder formula provided by the invention can be matched with conventional steel belts such as 430 stainless steel belts, 410 steel belts and the like, solid solution strengthening is realized by adding Cr, ni and Mo elements, and second phase strengthening is realized by adding TiC and VC hard phases on the basis. The second phase reinforcement adopted by the invention is carried out by combining TiC and VC, the reinforcement effect is obvious, and the agglomeration problem caused by a single reinforcement phase is avoided.
Furthermore, the designed welding wire has the wire diameter of 1.0-1.2mm, such as 1.0mm, 1.1mm or 1.2mm, and the like, can also be used for MIG and TIG welding processes, and has wide application range.
Drawings
Fig. 1 shows the microstructure of a weld overlay after laser cladding of the flux-cored wire prepared in example 2 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
The invention discloses a TiC and VC reinforced laser surfacing layer, which is a laser surfacing layer on the surface of a hydraulic support oil cylinder. After the surfacing layers are arranged on the surfaces of related parts in the hydraulic support, the surface hardness reaches HRC50-53, and the neutral salt spray corrosion (NSS) resistance of the surface laser surfacing layer reaches more than 500 hours. The surfacing layer is prepared by TIG welding multilayer cladding, and comprises the following components in percentage by mass: c:0.14-0.17%; si:0.42 to 0.58 percent; mn:0.78-1.39%; cr:18.50-19.80%; ni:0.65-1.58%; mo:0.43 to 1.32 percent; v:0.11 to 0.28 percent; ti:0.10 to 0.32 percent; the balance being Fe.
The reasonable blending of elements ensures that the surfacing layer has high hardness and corrosion resistance, and the main alloy elements in the formula of the metal wire material have the following functions:
chromium (Cr): cr is the preferred element for stainless steel with corrosion resistance requirements, and has lower cost than Ni and Cl resistance - The corrosion performance is excellent. In addition, cr facilitates the acquisition of the martensite structure of the target structure of the weld overlay of the present invention. In the invention, 430 stainless steel band and 30-32wt.% of filling rate are matched, and 26.00-30.0 wt.% of medicinal powder is added0% of Cr element. The powder is mixed with 410 stainless steel band and 30-32wt.% of filling rate, and 36.20-40.20% of Cr element is added in the powder.
Molybdenum (Mo): mo can be dissolved in an alpha-Fe matrix in a solid manner, and the atomic radius of Mo is much larger than that of Fe, so that the lattice distortion caused by the solid solution is obvious, and the strengthening effect is obvious. However, mo is expensive and the cold crack sensitivity of the weld overlay increases with increased Mo content. In comprehensive consideration, the invention is matched with 430 or 410 stainless steel strips and 30 to 32 weight percent of filling rate, and 2.00 to 5.00 percent of Mo element is added into the powder.
TiC: tiC belongs to a ceramic reinforcing phase and is typically a transition metal carbide, the crystals of which have metallic, ionic and covalent bonds present therein. TiC has the advantages of high melting point, high hardness and good corrosion resistance. After TiC is added into the powder, in the laser cladding process, a part of TiC can be decomposed to form Ti and C, and both can be dissolved in an alpha-Fe matrix in a solid mode to strengthen the matrix; the rest TiC can be retained in the surfacing layer and used as a second phase of the surfacing layer for strengthening, and the TiC is dispersed and distributed, so that the hardness and the wear resistance of the surfacing layer can be greatly improved. Because of high hardness and high melting point of TiC, when the addition amount of TiC is higher, the overlaying layer is easy to crack and part of TiC is easy to agglomerate. In comprehensive consideration, the powder is mixed with 430 or 410 stainless steel strips and 30 to 32wt.% of filling rate, and 0.5 to 1.5 percent of TiC powder is added into the powder.
VC: VC has high hardness, high thermodynamic stability and good intermiscibility with iron-based alloy, and is a good additive of the iron-based alloy. In the cladding process, a part of VC is decomposed by a laser heat source, and is replaced and solid-dissolved with elements such as Cr, mo and V in an alloy solution during solidification to finally form a ferrous solid solution, so that mutual strengthening among various metals is facilitated, the aim of solid solution strengthening is achieved, the V element can promote two stable carbides of related VC and V2C to be separated out, dislocation motion can be hindered through pinning and dragging, the effect of precipitation strengthening is achieved, and the strengthening of a matrix is realized; the VC in the rest part is used as heterogeneous nucleation core to refine the prior austenite grains and become a second phase for strengthening and strengthening the matrix. However, VC has high hardness and high melting point, and when the amount of VC is added, cracking of the weld overlay and partial VC agglomeration are easily caused. In comprehensive consideration, the invention is matched with 430 or 410 stainless steel bands and 30 to 32wt.% of filling rate, and 0.5 to 1.5 percent of VC powder is added into the medicinal powder.
Nickel (Ni): while Ni element can also improve corrosion resistance, when Ni is added in a small amount, it mainly acts to improve ductility and toughness of the overlay welding layer, and particularly in the present invention, the hardness is improved by adding TiC and VC hard phases, and a substrate having excellent deformability is more required. In the invention, a 430 stainless steel strip and a 30-32wt.% filling rate are matched, and 2.00-5.00% of Ni element is added into the medicinal powder. The powder is mixed with 410 stainless steel band and 30-32wt.% of filling rate, and 2.25-5.25% of Ni element is added into the powder.
Silicon (Si) and manganese (Mn): si and Mn have combined deoxidation effect, and can reduce the oxygen content in the overlaying layer and prevent the generation of pores. The oxides of Mn generally have a higher melting point and float more easily. The Si content is usually not less than 0.4%, and when it is too low, it is liable to generate oxidation pores and increase the amount of burnout of the alloy elements, and it does not perform deoxidation. Mn is dissolved into austenite to enlarge a gamma phase region, has a strong function of promoting the austenite to be stable, further promotes the generation of residual austenite, and indirectly improves the strength of the surfacing metal. According to the invention, a 430 stainless steel strip and a 30-32wt.% filling rate are matched, and 1.00-1.50% of Si element and 2.00-4.00% of Mn element are added into the powder. The powder is added with 0.86-1.36% of Si element and 2.00-4.00% of Mn element by matching with 410 stainless steel bands and 30-32wt.% of filling rate.
Carbon (C): c is an indispensable element for forming the martensite structure. In the invention, the C element is mainly provided by the 430 stainless steel strip and the added TiC and VC, the elemental C element is not additionally added, the phenomenon of uneven element distribution caused by the simple addition of the C element is avoided, and meanwhile, the carbon in the TiC and VC can avoid the phenomenon of chromium depletion caused by the excessive combination of the carbon and the Cr element to form chromium carbide, so that the corrosion resistance is reduced. By combining the transition coefficients of VC and TiC, the final C content in the invention belongs to the low-carbon range, and the range can ensure the excellent cold crack resistance of the surfacing layer.
The embodiment of the invention discloses a preparation method of a surfacing layer, wherein the surfacing layer is prepared on the surface of a hydraulic support after a flux-cored wire is processed by laser cladding. The flux-cored welding wire comprises a flux core and a welding skin, wherein the outer surface of the flux core is coated by the welding skin along the length direction of the welding wire; the welding skin is stainless steel band, and the flux core is metal mixed powder.
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The preferred embodiment of the present invention does not limit the technical solution of the present invention, and those skilled in the art can change the composition of the powder only by changing the composition of the steel strip (for example, the 430 stainless steel strip is replaced by the 410 stainless steel strip, etc.) based on the main technical concept of the present invention, but it still falls within the protection scope of the present invention when the chemical composition is the same after performing the multi-layer cladding by the test method specified in the present invention. Meanwhile, based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present invention.
When the welding skin adopts a 430 stainless steel strip, the metal mixed powder comprises the following raw material components in percentage by mass: si:1.00-1.50%; mn:2.00 to 4.00 percent; cr:26.00-30.00%; ni:2.00-5.00%; mo:2.00-5.00%; VC:0.50-1.50%; tiC:0.50-1.50%; the balance being Fe. The flux-cored wire has a flux powder filling rate of 30-32 wt.%.
When the welding skin adopts a 410 stainless steel strip, the metal mixed powder comprises the following raw material components in percentage by mass: si:0.86-1.36%; mn:2.00-4.00%; cr:36.20 to 40.20 percent; ni:2.25 to 5.25 percent; mo:2.00-5.00%; VC:0.50-1.50%; tiC:0.50-1.50%; the balance being Fe; the flux-cored wire has a flux powder filling rate of 30-32 wt.%.
The metal flux-cored wire is a martensitic stainless steel metal wire material with the diameter of phi 1.0mm to phi 1.2mm, such as 1.0mm, 1.1mm or 1.2mm.
The invention also discloses a preparation method of the TiC + VC reinforced martensite laser cladding flux-cored wire, which comprises the following steps of:
step 1: mixing metal powder according to the target flux core components;
step 2: putting the powder weighed in the step 1 into a vacuum heating furnace for drying and removing moisture; placing the dried medicinal powder in a powder mixer for fully mixing;
and step 3: the welding skin is a 430 or 410 stainless steel strip, oil on the surface of the 430 or 410 stainless steel strip is removed by adopting alcohol, the powder prepared in the step 2 is wrapped in the 430 or 410 stainless steel strip by flux-cored wire drawing equipment and is rolled and formed, and the aperture of a first drawing die is 2.6mm;
and 4, step 4: after the first process is finished, the die is replaced, the first process is carried out drawing again, the aperture of the die is reduced in sequence, finally the flux-cored wire with the diameter of 1.0-1.2mm is obtained, for example, the diameter can be 1.0mm, 1.1mm or 1.2mm, and the workpiece with the size meeting the requirement is wound in layers, so that the formed stainless steel flux-cored wire is obtained;
the metal wire for laser cladding is a flux-cored wire, belongs to a martensitic stainless steel type material, and has high hardness and plasticity and toughness while having good corrosion resistance by adding alloy elements for improving toughness.
Specific examples of the present invention are given below, and the effects of the present invention will be described by way of examples.
Example 1
Step 1, weighing and mixing metal powder by mass fraction, wherein the mixed metal powder comprises the following components: si:1.00 percent; mn:3.00 percent; cr:30.00 percent; ni:2.00 percent; mo:5.00 percent; tiC:0.7 percent; VC:0.50 percent; the balance being Fe.
And 2, drying the mixed metal powder, wrapping the metal powder by a 430 stainless steel strip, controlling the filling rate of the powder at 30wt.%, and drawing to prepare the flux-cored wire.
Step 3, adopting the flux-cored wire, performing TIG welding multilayer cladding (not less than 5 layers) on the surface of the hydraulic support, and obtaining a surfacing layer comprising the following components: c:0.15 percent; si:0.42 percent; mn:0.97 percent; cr:19.80 percent; ni:0.65 percent; mo:1.32 percent; ti:0.21 percent; v:0.11 percent; the balance being Fe. The surface hardness of the weld overlay is shown in table 1 below:
TABLE 1 surface hardness of the material of example 1
Figure BDA0004020881300000081
Example 2
Step 1, weighing and mixing metal powder by mass fraction, wherein the mixed metal powder comprises the following components: si:1.5 percent; mn:2.00 percent; cr:28.00 percent; ni:5.00 percent; mo:2.00 percent; tiC:0.5 percent; VC:1.50 percent; the balance being Fe.
And 2, drying the mixed metal powder, wrapping the metal powder by a 430 stainless steel strip, controlling the filling rate of the powder at 32wt.%, and drawing to prepare the flux-cored wire.
Step 3, adopting the flux-cored wire, performing TIG welding multilayer cladding (not less than 5 layers) on the surface of the hydraulic support, and obtaining a surfacing layer comprising the following components: c:0.17 percent; si:0.58 percent; mn:0.78%; cr:19.20 percent; ni:1.58 percent; mo:0.43 percent; ti:0.10 percent; v:0.27 percent; the balance being Fe. The surface hardness of the weld overlay is shown in table 2 below:
TABLE 2 surface hardness of the material of example 2
Figure BDA0004020881300000091
The laser weld overlay prepared in example 2 was structured as shown in FIG. 1: the structure of the surfacing layer is mainly a martensite structure, contains dendritic crystal segregation Cr-rich phase and compound carbides (V2C, VC, tiC and the like), and is uniformly distributed without defects of cracks, pores and the like.
Example 3
Step 1, weighing and mixing metal powder by mass fraction, wherein the mixed metal powder comprises the following components: si:1.30 percent; mn:4.00 percent; cr:26.00 percent; ni:3.5 percent; mo:3.5 percent; tiC:1.5 percent; VC:0.70 percent; the balance being Fe.
And 2, drying the mixed metal powder, wrapping the metal powder by a 430 stainless steel strip, controlling the filling rate of the powder at 31wt.%, and drawing to prepare the flux-cored wire.
Step 3, adopting the flux-cored wire, and carrying out TIG welding multilayer cladding (not less than 5 layers) on the surface of the hydraulic support, wherein the obtained surfacing layer comprises the following components: c:0.14 percent; si:0.56 percent; mn:1.39 percent; cr:18.50 percent; ni:1.14 percent; mo:0.84 percent; ti:0.32 percent; v:0.2 percent; the balance being Fe. The surface hardness of the weld overlay is shown in table 3 below:
TABLE 3 surface hardness of the material of example 3
Figure BDA0004020881300000101
Example 4
Step 1, weighing and mixing metal powder by mass fraction, wherein the mixed metal powder comprises the following components: si:0.86 percent; mn:3.00 percent; cr:40.2 percent; ni:5.25 percent; mo:5 percent; tiC:0.5 percent; VC:1.50 percent; the balance being Fe.
And 2, drying the mixed metal powder, wrapping the metal powder by a 410 stainless steel band, controlling the filling rate of the powder at 30wt.%, and drawing to prepare the flux-cored wire.
Step 3, adopting the flux-cored wire, and carrying out TIG welding multilayer cladding (not less than 5 layers) on the surface of the hydraulic support, wherein the obtained surfacing layer comprises the following components: c:0.16 percent; si:0.45 percent; mn:0.98 percent; cr:19.80 percent; ni:1.58 percent; mo:0.44%; ti:0.12 percent; v:0.28 percent; the balance being Fe. The surface hardness of the weld overlay is shown in table 4 below:
TABLE 4 surface hardness of the material of example 4
Figure BDA0004020881300000102
Example 5:
step 1, weighing and mixing metal powder by mass fraction, wherein the mixed metal powder comprises the following components: si:1.12 percent; mn:2.00 percent; cr:36.20 percent; ni:3.80 percent; mo:2.00 percent; tiC:1.5 percent; VC:0.50 percent; the balance being Fe.
And 2, drying the mixed metal powder, wrapping the metal powder by a 410 stainless steel band, controlling the filling rate of the powder at 32wt.%, and drawing to prepare the flux-cored wire.
Step 3, adopting the flux-cored wire, and carrying out TIG welding multilayer cladding (not less than 5 layers) on the surface of the hydraulic support, wherein the obtained surfacing layer comprises the following components: c:0.15 percent; si:0.5 percent; mn:0.8 percent; cr:18.6 percent; ni:1.04 percent; mo:1.30 percent; ti:0.32 percent; v:0.12 percent; the balance being Fe. The surface hardness of the weld overlay is shown in table 5 below:
TABLE 5 surface hardness of the material of example 5
Figure BDA0004020881300000111
Example 6:
step 1, weighing and mixing metal powder by mass fraction, wherein the mixed metal powder comprises the following components: si:1.36 percent; mn:4.00 percent; cr:38.00 percent; ni:2.25 percent; mo:3.5 percent; tiC:1 percent; VC:0.75 percent; the balance being Fe.
And 2, drying the mixed metal powder, wrapping the metal powder by a 410 stainless steel band, controlling the filling rate of the powder at 30wt.%, and drawing to prepare the flux-cored wire.
Step 3, adopting the flux-cored wire, performing TIG welding multilayer cladding (not less than 5 layers) on the surface of the hydraulic support, and obtaining a surfacing layer comprising the following components: c:0.17 percent; si:0.51 percent; mn:1.39 percent; cr:19.10 percent; ni:0.68 percent; mo:0.86 percent; ti:0.21 percent; v:0.18 percent; the balance being Fe. The surface hardness of the weld overlay is shown in table 6 below:
TABLE 6 surface hardness of the material of example 6
Figure BDA0004020881300000112
Figure BDA0004020881300000121
The invention further provides a preparation method of the metal flux-cored wire for laser cladding, which is a drawing preparation method of coating powder by adopting 430 or 410 stainless steel strips, and can prepare stainless steel metal wire materials with the diameter of phi 1.0 mm-phi 1.2mm, such as 1.0mm, 1.1mm or 1.2mm, and the like, and the stainless steel metal wire materials are used for carrying out laser cladding treatment on the surface of the hydraulic support oil cylinder. According to the invention, the stainless steel metal wire has the characteristics of high hardness while ensuring excellent corrosion resistance through the optimization of the formula and the ratio.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. A TiC and VC strengthened laser weld overlay is characterized in that the weld overlay comprises the following components in percentage by mass: c:0.14 to 0.17 percent; si:0.42 to 0.58 percent; mn:0.78-1.39%; cr:18.50-19.80%; ni:0.65-1.58%; mo:0.43-1.32%; v:0.11 to 0.28 percent; ti:0.10 to 0.32 percent; the balance being iron; the surfacing layer contains hard phases of TiC and VC.
2. A TiC and VC strengthened laser weld overlay according to claim 1 wherein the hardness of the weld overlay is HRC50-53.
3. A TiC and VC strengthened laser weld overlay according to claim 1, wherein the neutral salt spray corrosion resistance time of the weld overlay is not less than 500 hours.
4. The method for preparing a TiC and VC strengthened laser overlay of claim 1 wherein the overlay is prepared from a flux cored wire by laser cladding; the flux-cored wire comprises a flux core and a welding skin, wherein the flux core is wrapped by the welding skin, and the flux core is arranged along the length direction of the welding skin;
the flux core is metal mixed powder, and the composition of the flux core is changed along with the change of the welding skin composition.
5. The method of preparing a TiC and VC strengthened laser weld overlay of claim 4 wherein the flux core is present in the flux cored wire in an amount from about 30wt.% to about 32wt.%.
6. The TiC and VC reinforced laser weld overlay preparation method of claim 4, wherein the flux-cored wire has a diameter of 1.0mm-1.2mm.
7. The method of preparing a TiC and VC strengthened laser weld overlay of claim 4 wherein the flux cored wire is prepared by drawing.
8. The method of preparing a TiC and VC strengthened laser weld overlay of claim 4 wherein, when the weld skin is a 430 stainless steel band, the composition of the flux core is: si:1.00 to 1.50 percent; mn:2.00-4.00%; cr:26.00-30.00%; ni:2.00-5.00%; mo:2.00-5.00%; VC:0.50-1.50%; tiC:0.50-1.50%; the balance being Fe.
9. The method of preparing a TiC and VC strengthened laser weld overlay of claim 4 wherein, when the weld skin is a 410 stainless steel band, the composition of the flux core is: si:0.86-1.36%; mn:2.00 to 4.00 percent; cr:36.20 to 40.20 percent; ni:2.25 to 5.25 percent; mo:2.00-5.00%; VC:0.50 to 1.50 percent; tiC:0.50-1.50%; the balance being Fe.
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