Preparation method of TWIP (Twinning Induced Plasticity) steel with high strength and high plasticity

A high-strength and high-plasticity technology, applied in the field of ultra-fine-grained metal materials, can solve the problems of unsatisfactory performance of TWIP steel and complicated preparation method, and achieve the effect of easy realization, simple preparation method and excellent performance.

Active Publication Date: 2016-12-07
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Bulk nanometals have attracted the attention of many researchers at home and abroad because of their ultra-high strength. However, most nanometals usually have a structural application bottleneck where the uniform tensile elongation at room temperature is less than 5%. How to improve the plasticity of nanometals has become an international issue. Major scientific issues in the field of materials
[0004] The performance of TWIP steel in the prior art is not ideal, and the preparation method is relatively complicated

Method used

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  • Preparation method of TWIP (Twinning Induced Plasticity) steel with high strength and high plasticity
  • Preparation method of TWIP (Twinning Induced Plasticity) steel with high strength and high plasticity
  • Preparation method of TWIP (Twinning Induced Plasticity) steel with high strength and high plasticity

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Experimental program
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Effect test

Embodiment 1

[0027] 1. Preparation of TWIP steel by melting and rolling

[0028] (1) Vacuum induction furnace melting and casting to make TWIP steel ingots, forging and molding at a temperature of 950°C-1050°C to obtain billets; the composition is shown in the following table:

[0029]

[0030] (2) Hot rolling: heat preservation at 1250°C for 2 hours, start rolling temperature at 1200°C, intermediate rolling temperature at 900°C, final rolling thickness at 20mm; (3) high temperature annealing for homogenization treatment: heat preservation at 1000°C for 2 hours; Rolling: cut the sample into small pieces, and carry out warm rolling at 400°C with a rolling thickness of 10mm; asynchronous rolling: the rolling thickness is 1mm, and the speed ratio is 1.5; the final synchronous rolling mill cold rolling thickness is 0.5mm.

[0031] After step (3), the microstructure is composed of uniform but relatively coarse austenite grains, and most of the austenite grains contain annealing twins, with a...

Embodiment 2

[0037] 1. Preparation of TWIP steel by melting and rolling

[0038](1) Vacuum induction furnace smelting and casting to make TWIP steel ingots, forging at 950°C-1050°C to obtain billets; (2) Hot rolling: 1250°C for 2 hours, start rolling temperature is 1200°C, intermediate rolling temperature is 900℃, the final rolling thickness is 20mm; (3) high temperature annealing for homogenization treatment: 1000℃ for 2h; (4) warm rolling: cut the sample into small pieces, and warm rolling at 500℃, the rolling thickness is 10mm; asynchronous rolling: the rolling thickness is 1mm, and the different speed ratio is 1.5; the final synchronous rolling mill cold rolling thickness is 0.5mm.

[0039] After step (3), the microstructure is composed of uniform but relatively coarse austenite grains, and most of the austenite grains contain annealing twins, with an average grain size of 80 μm.

[0040] After step (4), the microstructure is a submicron-scale lamellar structure; the lamellar interfac...

Embodiment 3

[0044] 1. Preparation of TWIP steel by melting and rolling

[0045] (1) Vacuum induction furnace melting and casting to make TWIP steel ingots, forging at 950°C-1050°C to obtain billets; (2) Hot rolling: 1300°C for 2 hours, start rolling temperature is 1250°C, intermediate rolling temperature is 950°C, the final rolling thickness is 20mm; (3) Homogenization treatment by high temperature annealing: 1100°C heat preservation for 2h; (4) Warm rolling: cut the sample into small pieces, and warm rolling at 600°C, the rolling thickness is 10mm; asynchronous rolling: the rolling thickness is 1mm, and the different speed ratio is 1.5; the final synchronous rolling mill cold rolling thickness is 0.5mm.

[0046] After step (3), the microstructure is composed of uniform but relatively coarse austenite grains, and most of the austenite grains contain annealing twins, with an average grain size of 80 μm.

[0047] After step (4), the microstructure is a submicron-scale lamellar structure; t...

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Abstract

The invention relates to an ultra-fine grain metal material, and particularly provides a preparation method of TWIP (Twinning Induced Plasticity) steel with high strength and high plasticity. The TWIP steel is formed by nearly equiaxed-shaped perfect recrystallization grains and large annealing twins in recrystallized layer sheets. The invention further discloses the preparation method. The TWIP steel with high strength and high plasticity provided by the invention has excellent performances, and the preparation method is simple.

Description

technical field [0001] The invention relates to ultra-fine-grain metal materials, and in particular provides a preparation method of high-strength and high-plasticity TWIP steel. Background technique [0002] Bulk nanometals have attracted the attention of many researchers at home and abroad because of their ultra-high strength. However, most nanometals usually have a structural application bottleneck where the uniform tensile elongation at room temperature is less than 5%. How to improve the plasticity of nanometals has become an international issue. Major scientific questions in the field of materials. Studies have confirmed that the essence of the low plasticity of nanometer metals is that the strain hardening rate decreases too quickly, which leads to premature instability of the necking. Recently, the use of spatially non-uniform construction of the density of microstructure interfaces (such as grain boundaries, twin boundaries, etc.) has provided a new idea for enhanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
CPCC21D8/005C21D2211/001
Inventor 武晓雷杨沐鑫袁福平姜萍
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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