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TWIP steel plate with different crystal grain sizes and crystal twin contents as well as preparation method thereof

A technology of grain size and steel plate, which is applied in the field of TWIP steel plate and its preparation, can solve the problems of high elongation and tensile strength not reaching 1000MPa, and achieve the effect of simple preparation method

Inactive Publication Date: 2021-01-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Korean scientist Hwang (Hwang J.K.,Effecut of grain size on tensile and wiredrawing behaviors in twinning-induced plasticity steel,Materials Science and Engineering:A,Vol.772,138709,2020) studied Fe-17Mn-2Al-0.6C steel, through Vacuum smelting-hot rolling to obtain hot-rolled steel plates with a thickness of 20 mm, heat treatment at 950, 1100, and 1250 °C for 30 minutes, respectively, to obtain fully recrystallized austenite grain microstructures with average grain sizes of 12, 65, and 202 μm, elongation Between 60-80%, the tensile strength is 700-900MPa, and the yield strength is between 300-500MPa. As the grain size increases, the elongation increases, and the tensile strength and yield strength decrease, but the tensile strength remains unchanged. Reach above 1000MPa

Method used

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  • TWIP steel plate with different crystal grain sizes and crystal twin contents as well as preparation method thereof
  • TWIP steel plate with different crystal grain sizes and crystal twin contents as well as preparation method thereof
  • TWIP steel plate with different crystal grain sizes and crystal twin contents as well as preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Alloy raw materials Fe, Mn, Si, Nb, C powders are placed in an electromagnetic induction furnace, vacuum smelted under the protection of argon, and then the smelted molten steel is cast into ingots, and the weight percentages of the raw materials are C: 0.62%, Mn : 20.21%, Si: 0.18%, Nb: 0.06%, S: 0.02%, the balance is Fe and unavoidable impurities;

[0031] The ingot was heated to 1200°C for 6 hours for homogenization, the initial rolling temperature was 1150°C, and the rolling was continued for 7 passes with a total deformation of 77.5% and a reduction rate of 20%;

[0032] After rolling, the temperature is lowered to room temperature at a rate of 60°C / s, and then placed in a resistance furnace for annealing treatment, kept at 700°C for 2 hours, taken out and air-cooled to room temperature, and finally a steel plate with ultra-high elongation is obtained, and the thickness of the steel plate is 18mm; The tensile strength is 967MPa, the elongation is 115%, and the yiel...

Embodiment 2

[0034] Alloy raw materials Fe, Mn, Si, Nb, C powders are placed in an electromagnetic induction furnace, vacuum smelted under the protection of argon, and then the smelted molten steel is cast into ingots, and the weight percentages of the raw materials are C: 0.62%, Mn : 20.21%, Si: 0.18%, Nb: 0.06%, S: 0.02%, the balance is Fe and unavoidable impurities;

[0035] Heating the ingot to 1200°C for 6 hours for homogenization treatment, the initial rolling temperature is 1050°C, continuous rolling for 7 passes, the total deformation is 77.5%, and the reduction ratio is kept at 20%;

[0036] After rolling, the temperature is lowered to room temperature at a rate of 60°C / s, and then placed in a resistance furnace for annealing treatment, kept at 700°C for 2 hours, taken out and air-cooled to room temperature, and finally a steel plate with ultra-high elongation is obtained, and the thickness of the steel plate is 18mm; The tensile strength is 1008MPa, the elongation is 112%, and th...

Embodiment 3

[0038] Alloy raw materials Fe, Mn, Si, Nb, C powders are placed in an electromagnetic induction furnace, vacuum smelted under the protection of argon, and then the smelted molten steel is cast into ingots, and the weight percentages of the raw materials are C: 0.62%, Mn : 20.21%, Si: 0.18%, Nb: 0.06%, S: 0.02%, the balance is Fe and unavoidable impurities;

[0039] Heating the ingot to 1200°C for 6 hours for homogenization treatment, the initial rolling temperature is 950°C, continuous rolling for 7 passes, the total deformation is 77.5%, and the reduction ratio is kept at 20%;

[0040] After rolling, the temperature is lowered to room temperature at a rate of 60°C / s, and then placed in a resistance furnace for annealing treatment, kept at 700°C for 2 hours, taken out and air-cooled to room temperature, and finally a steel plate with ultra-high elongation is obtained, and the thickness of the steel plate is 18mm; The tensile strength is 1035MPa, the elongation is 107%, and the...

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Abstract

The invention discloses a TWIP steel plate with different crystal grain sizes and crystal twin contents as well as a preparation method thereof. The steel plate consists of the following chemical components in percentage by weight: 0.62-0.64% of C, 20.21-20.24% of Mn, 0.18-0.20% of Si, 0.06-0.08% of Nb, 0.02-0.04% of S and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: (1) performing vacuum smelting on alloy raw materials such as Fe, Mn and C under protection of argon gas, and casting the alloy raw materials into cast ingots; (2) heating thecast ingots to a temperature of 1200 + / - 10 DEG C and performing uniform treatment after preserving heat for 6 hours, and continuously rolling for seven times, wherein primary rolling temperatures areseparately 1150 + / -10 DEG C and 1050 + / -10 DEG C or 950 + / -10 DEG C, total deformation amount is 77.5-77.9%, and a compression rate is kept at 20 + / -5%; (3) cooling to the room temperature at a rateof 60-80 DEG C / s, performing annealing treatment, preserving the heat for 2 hours at 700 + / - 10 DEG C, and taking out and cooling in air to the room temperature. The steel plate with a super-high elongation rate is finally obtained, and the tensile strength of the TWIP steel plate is higher than that of similar steel plate materials. The preparation method is economic, effective, simple and high in operability.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a TWIP steel plate with different grain sizes and twin content and a preparation method thereof. Background technique [0002] Steel is the material basis for the development of society and industry. Its composition is mainly iron, and the mass percentage of carbon content is between 0.0218 and 2.11%. It is not only cheap, but also has good physical, chemical and mechanical properties. Therefore, steel is widely used in Construction, automobile, aerospace, machinery, petroleum and other industrial fields. At present, high-strength steel plates have undergone several generations of development in the automotive industry. The first generation of high-strength automotive steels mainly represent interstitial-free steels, dual-phase steels, and phase-change-induced plasticity steels. Reaching 15GPa%, it is difficult to have high strength and high plasticity at the same time. The se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C33/04C21D8/02C21D1/26
CPCC21D1/26C21D8/0205C21D8/0226C22C33/04C22C38/02C22C38/04C22C38/12
Inventor 申勇峰罗玉洁尹婷玮薛文颖
Owner NORTHEASTERN UNIV LIAONING