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TWIP steel and preparation method thereof

A technology of induced plasticity and twinning, which is applied in the field of alloy preparation, can solve problems such as difficulty in obtaining higher strength and higher plasticity, and achieve the effect of promoting the TWIP effect, broad application prospects, and increasing stacking fault energy

Active Publication Date: 2019-07-30
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the defect that it is difficult to obtain higher strength and higher plasticity in single strengthening of twinning strengthening and nano-precipitation strengthening in steel, and is based on the comparative study of problems such as smelting, homogenization and delayed cracking caused by high Mn content in TWIP steel In addition, it is proposed to use different alloying elements to replace part of the Mn content to increase SFE, promote the TWIP effect, stabilize the austenite phase, inhibit the martensitic transformation, and refine the twin structure

Method used

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  • TWIP steel and preparation method thereof

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Experimental program
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Effect test

Embodiment approach

[0035] A preferred embodiment of the present invention is:

[0036] (1) Preparation of master alloy: use Fe, Mn, Cu, Al, Ni and C high-purity metals or powders with a purity of ≥99.9wt%, and use suction casting after high-vacuum arc melting or melting metal molds in vacuum induction furnaces Prepare TWIP steel by casting or similar smelting methods;

[0037] (2) Hot rolling, cold rolling and solution treatment: the TWIP steel obtained in step (1) is hot-rolled at 1100-1200°C, and then cold-rolled at 65-75% of the pass reduction, and then rolled at 1000 Solution treatment is carried out at ~1200°C for 1.5~3h.

[0038](3) Strong magnetic field aging treatment: place the sample obtained in step (2) in a strong magnetic field of 1-10T, adjust the position of the sample, keep it warm for 2-4 hours at a temperature of 525-575° C., and then quench to obtain TWIP steel.

Embodiment 1

[0040] (1) Master alloy preparation: use high-purity metals or powders such as Fe, Mn, Cu, Al, Ni and C with a purity ≥ 99.9 wt%, and smelt the metals in a vacuum induction furnace. During the smelting process, 1.5Hz low-frequency electromagnetic stirring is applied, and the alloy ingot is prepared by casting in a copper mold under the protection of 0.1 standard atmospheric pressure argon;

[0041] (2) Hot rolling, cold rolling and solution treatment: the TWIP steel obtained in step (1) is subjected to hot rolling treatment at 1100°C, and then after the cold rolling treatment with a pass reduction of 65%, it is solidified at 1000°C. Dissolve for 1.5h.

[0042] (3) Strong magnetic field aging treatment: place the sample obtained in step (2) in a 0.1T strong magnetic field, adjust the position of the sample, keep it at 525° C. for 2 hours and then quench to obtain TWIP steel.

[0043] The tensile strength of the prepared 15Mn-0.6C-1Cu-2Ni-1AlTWIP steel is 1100MPa, the elongatio...

Embodiment 2

[0048] (1) Master alloy preparation: use high-purity metals or powders such as Fe, Mn, Cu, Al, Ni and C with a purity ≥ 99.9 wt%, and smelt the metals in a vacuum induction furnace. During the smelting process, 1.5Hz low-frequency electromagnetic stirring is applied, and the alloy ingot is prepared by casting in a copper mold under the protection of 0.1 standard atmospheric pressure argon;

[0049] (2) Hot rolling, cold rolling and solution treatment: the TWIP steel obtained in step (1) is subjected to hot rolling treatment at 1150° C., and then after cold rolling treatment with a pass reduction of 70%, it is solidified at 1100° C. Dissolving treatment for 2h.

[0050] (3) Strong magnetic field aging treatment: place the sample obtained in step (2) in a 20T strong magnetic field, adjust the position of the sample, and heat it at 550°C for 2.5 hours before quenching to obtain TWIP steel.

[0051] The tensile strength of the prepared 15Mn-0.6C-1Cu-2Ni-1AlTWIP steel is 1150MPa, ...

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Abstract

The invention provides high-strength high-plasticity TWIP steel and a preparation method thereof. The technical scheme is that: aimed at the defects that higher strength and higher plasticity are notliable to achieve through single of twinning strengthening and nano precipitation strengthening in steel, the invention provides the preparation method of utilizing alloy elements like Cu, Ni and Al to replace a part of Mn to improve stacking fault energy, promote the TWIP effect, stabilize austenite, inhibit martensite phase transformation and refine twining structure on the basis that smelting,homogenization and delayed cracking problems due to high Mn content in TWIP steel are comparatively studied; and size, density and distribution of nano rich Cu particles and NiAl particles generated in steel are controlled through a strong magnetic field, and strength of TWIP steel is improved under the precondition that plasticity and toughness are not reduced.

Description

technical field [0001] The invention relates to a high-strength and high-plasticity twin-induced plasticity steel and a preparation method thereof, belonging to the technical field of alloy preparation. Background technique [0002] Twin-induced plasticity (TWIP) steel not only has excellent strength and ductility, but also has higher impact resistance and energy absorption capacity than traditional alloy steel. Widely used in automotive steel. However, due to the problems related to melting, homogenization and delayed cracking of TWIP steel with high Mn content, it has important theoretical and application value to explore and solve the problems in the preparation process of TWIP steel and further improve the mechanical properties of the alloy. [0003] The deformation of TWIP steel is mainly in the twinning mode, which is closely related to the stacking fault energy (SFE). By adding Cu, Al, Ni and other alloy elements to replace part of Mn, the SFE can be improved, the T...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21D1/04C21D1/18C21D6/00C21D8/00C22C38/04C22C38/06C22C38/08C22C38/16
CPCC21D1/04C21D1/18C21D6/005C21D8/005C22C33/04C22C38/001C22C38/002C22C38/04C22C38/06C22C38/08C22C38/16
Inventor 左小伟申壮仇念双闫冬超
Owner NORTHEASTERN UNIV
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