CN106011422B - High-strength steel and its low cost preparation method with bimodal yardstick ferritic structure - Google Patents
High-strength steel and its low cost preparation method with bimodal yardstick ferritic structure Download PDFInfo
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- CN106011422B CN106011422B CN201610628277.8A CN201610628277A CN106011422B CN 106011422 B CN106011422 B CN 106011422B CN 201610628277 A CN201610628277 A CN 201610628277A CN 106011422 B CN106011422 B CN 106011422B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of high-strength steel and its low cost preparation method with bimodal yardstick ferritic structure, ordinary low-carbon steel is used as raw material plate, pass through cold deformation+two-phase section Quenching Treatment, obtain bimodal yardstick tissue of the tiny quasi-polygonal ferrite crystal grain distribution around thick polygonal ferrite crystal grain, tiny quasi-polygonal ferrite crystal grain serves the effect of hardening constituent, and thick polygonal ferrite crystal grain then ensure that the plasticity of steel.There is excellent comprehensive mechanical property using high-strength steel made from the preparation method of the present invention, yield strength >=650MPa, tensile strength >=800MPa, uniform elongation >=10.0%, work hardening index >=0.20, yield tensile ratio is less than 0.90.Technical process is simple simultaneously, and production cost is relatively low.
Description
Technical field
This patent disclosure relates generally to a kind of high-strength steel and preparation method thereof, more particularly to one kind to have bimodal yardstick ferrite brilliant
The high-strength steel and its low cost preparation method of grain distribution.
Background technology
Advanced steel product is mainly characterized by Ultra-fine Grained, high-cleanness, high and high uniformity, and its core theory and technology are
Realize the Ultra-fine Grained or super fine organization of steel.At present, by controlled rolling and the application of controlled cooling technique, have been able to use
Q235 ordinary low-carbon steels produce the high-strength steel with super fine organization, and its yield strength can be realized and doubled.But there are some researches show,
Ultra-fine grain or tissue also result in the work hardening capacity of steel and uniform elongation and reduced, and crack sensitivity increase, limit
The extension of its application.
Research for Cu alloys shows, relatively large sized by being introduced in the fine grain matrix of face-centered cubic alloy
Crystal grain, bimodal grain size distribution is obtained, tiny crystal grain ensures that material has high intensity, and larger crystal grain then ensures its modeling
Shape, so as to obtain more preferable intensity and plastic equilibrium.For ferrous materials, pass through the bimodal yardstick point of single-phase crystal grain
Cloth realizes the optimization of performance, is also beneficial to improve its corrosion resistance.
At present, by cold rolling or warm-rolling and the use being repeatedly heat-treated, bimodal size ultra-fine grained ferrite+more can be obtained
Dissipate the tissue of carbide or micro- fine grained texture of " nano-carbide of bimodal ferrite crystal grain+uneven distribution ", but its plasticity
Poor, uniform elongation is less than 6%, and process route is longer, and production process control difficulty is larger, limits and further pushes away
Wide application.
The content of the invention
It is an object of the invention to provide a kind of with high intensity, high-ductility, high work hardening index and low yield tensile ratio
The 700MPa level high-strength steel of bimodal crystal particle scale distribution；The technical problem to be solved in the present invention is that above-mentioned have bimodal crystal particle scale
The low cost preparation method of the high-strength steel of distribution.
In order to solve the above technical problems, the technical solution used in the present invention is：At plate cold rolling and two-phase section heat
Reason, the recrystallization process and phase transition process of cold deformation crystal grain are controlled, obtain the ferrite crystal grain of different scale.
The raw materials used plate of preparation method of the present invention is common low carbon steel plate；The quality percentage of the chemical composition of the raw material plate
Content is：C 0.10%~0.20%, Si 0.10%~0.20%, Mn 0.60%~0.70%, P≤0.015%, S≤
0.01%, surplus is Fe and inevitable impurity, and organizational composition is ferrite and a small amount of pearlite.
Preparation method of the present invention includes plate cold rolling and a heat treatment step：The cold-rolling process：Total deformation is not small
In 50%；The heat treatment uses tow-phase region heat treatment：Holding temperature is located at two-phase section lower limit, is 720- for ordinary low-carbon steel
760 DEG C, soaking time 5-60min, water cooling.
There are the grain size distribution of bimodal yardstick, distribution peaks point using high-strength steel made from the preparation method of the present invention
Not in 2-6 μm and 10-15 μm.Institutional framework is that thick polygonal ferrite crystal grain and tiny quasi-polygonal ferrite crystal grain are fitted together to
Coexist, small grains are uniformly distributed in around coarse grain, and the area ratio shared in visual field compared with little crystal grain (being less than 10 μm)
Example is 45%-70%.
There is excellent comprehensive mechanical property using high-strength steel made from the preparation method of the present invention, yield strength >=
650MPa, tensile strength >=800MPa, uniform elongation >=10.0%, work hardening index >=0.20, yield tensile ratio are less than 0.90.
Inventor has further been found that heat treatment temperature takes 730- when cold deformation cumulative deformation is controlled in 50-60%
750 DEG C, soaking time 10-30min, the steel plate obtained after water cooling has comprehensive mechanical property the most excellent, wherein average
Yield strength >=700MPa, tensile strength >=850MPa, while also can guarantee that higher uniform elongation.This be probably due to
Fine ferrite crystal grain has reached optimal combination with thick ferrite crystal grain in structure of steel obtained by above-mentioned technique section.
The present invention has just obtained single with bimodal size distribution only with a cold deformation and a Technology for Heating Processing
The high-strength steel of ferritic structure, raw materials used plate cost is cheap, simple production process.
Brief description of the drawings
Fig. 1 is using the macrograph for the steel for quenching to obtain after two-phase section insulation 5min after cold rolling in the present invention.
Fig. 2 is using the crystal particle scale distribution for the steel for quenching to obtain after two-phase section insulation 5min after cold rolling in the present invention.
Fig. 3 is using the tissue for the steel for quenching to obtain after 650 DEG C of insulation 15min after cold rolling in the present invention.
Fig. 4 is using the tissue for the steel for quenching to obtain after 800 DEG C of insulation 30min after cold rolling in the present invention.
Fig. 5 is that 800 DEG C of crystal particle scales for being incubated the steel for quenching to obtain after 30min are distributed after cold rolling is used in the present invention.
Fig. 6 is using the tissue for the steel for quenching to obtain after 850 DEG C of insulation 5min after cold rolling in the present invention.
Embodiment
Below by specific embodiment and with reference to accompanying drawing come be described in detail the present invention there is bimodal yardstick ferritic structure
High-strength steel low cost preparation method.It should be appreciated by those skilled in the art that following embodiments are only the examples to the present invention
Property explanation, not be used for the present invention carry out any restrictions.
Embodiment 1
Raw material plate steel grade chemical composition is according to mass percentage：C 0.10%~0.20%, Si 0.10%~
0.20%th, Mn 0.60%~0.70%, P≤0.015%, S≤0.01%, surplus are Fe and inevitable impurity, and plate is thick
5.5mm is spent, organizational composition is ferrite and a small amount of pearlite.
Cold-rolling deformation is carried out using cold-rolling mill, cumulative deformation 55%, then carries out a two-phase section quenching, concrete technology
For：750 DEG C are incubated after 5min water cooling at once, you can obtain the high strength steel plate of the present invention.
Fig. 1 is the macrograph for the high strength steel plate that the present embodiment obtains；As seen from Figure 1, this high strength steel plate be organized as it is thick
Big polygonal ferrite crystal grain and tiny quasi-polygonal ferrite crystal grain it is mutually embedding and, wherein the little crystal grain less than 10 μm exists
Shared area ratio is about 68% in visual field.
Fig. 2 is the crystal particle scale distribution for the high strength steel plate that the present embodiment obtains, and double-scale crystal grain distribution peaks are respectively in 3-6
μm and 10-13 μm.
Embodiment 2
The raw material plate of use is with embodiment 1, the cumulative deformation 50% of cold-rolling process, Technology for Heating Processing：750 DEG C of insulations
At once water cooling after 15min.
Obtained high strength steel plate with crystal particle scale it is observed that analyze, structure and crystal grain distribution are similar to Example 1, and its is medium and small
In 10 μm of little crystal grains area ratio shared in visual field be about 59%.Double-scale crystal grain distribution peaks respectively at 3-5 μm and
11-15μm。
Embodiment 3
The raw material plate of use is with embodiment 1, the cumulative deformation 55% of cold-rolling process, Technology for Heating Processing：730 DEG C of insulations
At once water cooling after 30min.
Obtained high strength steel plate with crystal particle scale it is observed that analyze, structure and crystal grain distribution are similar to Example 1, and its is medium and small
In 10 μm of little crystal grains area ratio shared in visual field be about 45.5%.Double-scale crystal grain distribution peaks are respectively at 2-4 μm
With 12-16 μm.
Embodiment 4
The raw material plate of use is with embodiment 1, the cumulative deformation 60% of cold-rolling process, Technology for Heating Processing：740 DEG C of insulations
At once water cooling after 10min.
Obtained high strength steel plate with crystal particle scale it is observed that analyze, structure and crystal grain distribution are similar to Example 1, and its is medium and small
In 10 μm of little crystal grains area ratio shared in visual field be about 55.7%.Double-scale crystal grain distribution peaks are respectively at 3-5 μm
With 12-15 μm.
Embodiment 5
The raw material plate of use is with embodiment 1, the cumulative deformation 50% of cold-rolling process, Technology for Heating Processing：730 DEG C of insulations
At once water cooling after 20min.
Obtained high strength steel plate with crystal particle scale it is observed that analyze, structure and crystal grain distribution are similar to Example 1, and its is medium and small
In 10 μm of little crystal grains area ratio shared in visual field be about 47.2%.Double-scale crystal grain distribution peaks are respectively at 2-5 μm
With 11-15 μm.
Embodiment 6
The raw material plate of use is with embodiment 1, the cumulative deformation 55% of cold-rolling process, Technology for Heating Processing：750 DEG C of insulations
At once water cooling after 50min.
Obtained high strength steel plate with crystal particle scale it is observed that analyze, structure and crystal grain distribution are similar to Example 1, and its is medium and small
In 10 μm of little crystal grains area ratio shared in visual field be about 45%.Double-scale crystal grain distribution peaks respectively at 3-6 μm and
10-15μm。
Embodiment 7
The raw material plate of use is with embodiment 1, the cumulative deformation 55% of cold-rolling process, Technology for Heating Processing：760 DEG C of insulations
At once water cooling after 10min.
Obtained high strength steel plate with crystal particle scale it is observed that analyze, structure and crystal grain distribution are similar to Example 1, and its is medium and small
In 10 μm of little crystal grains area ratio shared in visual field be about 57.6%.Double-scale crystal grain distribution peaks are respectively at 3-6 μm
With 11-15 μm.
Comparative example 1
The raw material plate of use is with embodiment 1, the cumulative deformation 55% of cold-rolling process, Technology for Heating Processing：650 DEG C of insulations
At once water cooling after 15min.
Fig. 3 is the macrograph of high strength steel plate that this comparative example obtains, obtained steel plate it is observed that analyzed with crystal particle scale,
Organizational composition is uniform ferrite and the pearlite of nodularization, the bimodal yardstick point of single ferrite and its crystal grain does not occur
Cloth.
Comparative example 2
The raw material plate of use is with embodiment 1, the cumulative deformation 55% of cold-rolling process, Technology for Heating Processing：800 DEG C of insulations
At once water cooling after 30min.
Fig. 4 is the macrograph for the high strength steel plate that this comparative example obtains, and Fig. 5 is the crystalline substance for the high strength steel plate that the present embodiment obtains
Grain size distribution, obtained steel plate with crystal particle scale it is observed that analyze, organizational composition is ferrite and martensite, does not obtain list
One ferritic structure, do not occur the bimodal distribution of crystal particle scale.
Comparative example 3
The raw material plate of use is with embodiment 1, the cumulative deformation 55% of cold-rolling process, Technology for Heating Processing：850 DEG C of insulations
At once water cooling after 5min.
Fig. 6 is the macrograph of high strength steel plate that this comparative example obtains, obtained steel plate it is observed that analyzed with crystal particle scale,
Organizational composition is martensite and minimal amount of ferrite, does not obtain the bimodal size distribution of single ferritic structure and crystal grain.
The steel plate sample that the various embodiments described above and comparative example obtain is detected according to concerned countries standard, and testing result is shown in
Table 1.
Table 1：Properties of sample
Claims (5)
- A kind of 1. low cost preparation method of the high-strength steel with bimodal yardstick ferritic structure, using ordinary low-carbon steel as raw material Plate, the high-strength steel is made through cold deformation and a heat treatment step；WhereinThe chemical composition weight/mass percentage composition of the raw material plate used for：C 0.10%~0.20%, Si 0.10%~0.20%, Mn 0.60%~0.70%, P≤0.015%, S≤0.01%, surplus are Fe and inevitable impurity, and its organizational composition is Ferrite+a small amount of pearlite；The cold deformation is cold-rolling deformation, total deformation 50%-60%；The once heat treatment is two-phase section Quenching Treatment, in 730~750 DEG C of insulations of two-phase section lower limit temperature of ordinary low-carbon steel Water cooling after 10~30min.
- 2. a kind of high-strength steel with bimodal yardstick ferritic structure, is made as the low cost preparation method described in claim 1, The high-strength steel is organized as that thick polygonal ferrite crystal grain and tiny quasi-polygonal ferrite crystal grain are chimeric to be coexisted, tiny crystalline substance Grain is uniformly distributed in around coarse grain, and crystallite dimension has bimodal size distribution.
- 3. the high-strength steel according to claim 2 with bimodal yardstick ferritic structure, the high-strength steel crystallite dimension point Cloth peak value is respectively in 2-6 μm and 10-15 μm.
- 4. the high-strength steel according to claim 2 with bimodal yardstick ferritic structure, 10 μm are less than in the high-strength steel Little crystal grain area ratio shared in visual field be 45%-70%.
- 5. the high-strength steel according to claim 2 with bimodal yardstick ferritic structure, the mechanical property of the high-strength steel Index is：Yield strength >=650MPa, tensile strength >=800MPa, uniform elongation >=10%, work hardening index are more than 0.2, yield tensile ratio is less than 0.9.
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| CN110863084B (en) * | 2018-08-28 | 2021-08-03 | 南京理工大学 | Processing method for regulating ductility and toughness of dual-phase steel material through surface strong plastic deformation |
| CN110055379A (en) * | 2019-06-03 | 2019-07-26 | 郑州航空工业管理学院 | A kind of preparation method of micro- multi-layer sheet structure steel plate |
| CN114622074B (en) * | 2022-05-12 | 2022-08-05 | 中北大学 | Austenitic stainless steel, heat treatment process thereof and application of heat treatment process |
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| CN100537791C (en) * | 2007-11-16 | 2009-09-09 | 燕山大学 | The manufacture method of high-plastic ultra-fine grain micro-alloy low-carbon steel |
| CN102080192B (en) * | 2011-01-07 | 2012-07-25 | 南京钢铁股份有限公司 | Low-yield ratio, high-plasticity, ultrafine-grain and high-strength steel and manufacturing method thereof |
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Effective date of registration: 20200811 Address after: 225300 Sanshe Village, Zhangguo Town, Xinghua City, Taizhou City, Jiangsu Province Patentee after: XINGHUA YINLONG STAINLESS STEEL PRODUCTS Co.,Ltd. Address before: 063000 No. 38 Hua Yan Road, North Tangshan City Road, Hebei Patentee before: TANGSHAN College |
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