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Ultrahigh-strength-toughness medium-manganese phase-change induced plasticity steel and preparation method thereof

A technology that induces plasticity and ultra-high strength, which is applied in the field of high-strength steel preparation, can solve the problems of long time consumption and low production efficiency, and achieve the effects of reducing production costs, high feasibility, and reducing costs

Active Publication Date: 2018-12-14
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the heat preservation in the two-phase area generally takes a long time, it takes hours or even days, the production efficiency is low

Method used

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  • Ultrahigh-strength-toughness medium-manganese phase-change induced plasticity steel and preparation method thereof
  • Ultrahigh-strength-toughness medium-manganese phase-change induced plasticity steel and preparation method thereof
  • Ultrahigh-strength-toughness medium-manganese phase-change induced plasticity steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. According to the ingredients in Table 1, the alloy ingredients are carried out, and the intermediate frequency vacuum induction melting furnace is used for smelting. After refining and vacuum degassing, it is poured into columnar steel ingots under the protection of argon.

[0028] 2. The as-cast steel ingot is homogenized and annealed at 1200℃~1250℃ for 1.5h-2h and then forged. The starting forging temperature is 1200±5℃, the final forging temperature is 850±5℃, then cooled to room temperature, and the final shape is 100mm (width)×30mm (thickness) slab sample.

[0029] 3. Heat the forged slab at 1150°C-1200°C for 1.5h-2h, then start rolling at 1150±5°C, finish rolling at 880±5°C, the thickness of the hot-rolled plate is 4-6mm, and finally air-cool to room temperature.

[0030] Table 1 The preferred alloy composition 1 of medium manganese steel in the present invention

[0031]

[0032] The hot-rolled material is subjected to heat treatment structure control, mai...

Embodiment 2

[0038] According to the composition of Table 4, the alloy ingredients are carried out, and the intermediate frequency vacuum induction melting furnace is used for smelting. After refining and vacuum degassing, it is poured into columnar steel ingots under the protection of argon.

[0039] 2. The as-cast steel ingot is homogenized and annealed at 1200℃~1250℃ for 1.5h-2h and then forged. The starting forging temperature is 1200±5℃, the final forging temperature is 850±5℃, then cooled to room temperature, and the final shape is 100mm (width)×30mm (thickness) slab sample.

[0040] 3. Heat the forged slab at 1150°C-1200°C for 1.5h-2h, then start rolling at 1150±5°C, finish rolling at 880±5°C, the thickness of the hot-rolled plate is 4-6mm, and air-cool to room temperature.

[0041] 4. Heat the hot-rolled sample at 770-800°C for 1 hour, then quench it, and then temper it at 200°C for 20 minutes. Pickle the tempered sample in 1:3 hydrochloric acid solution for 20 minutes to remove th...

Embodiment 3

[0048] 1. According to the ingredients in Table 6, the alloy ingredients are carried out, and the intermediate frequency vacuum induction melting furnace is used for smelting. After refining and vacuum degassing, it is poured into columnar steel ingots under the protection of argon.

[0049] 2. The as-cast steel ingot is homogenized and annealed at 1200℃~1250℃ for 1.5h-2h and then forged. The starting forging temperature is 1200±5℃, the final forging temperature is 850±5℃, then cooled to room temperature, and the final shape is 100mm (width)×30mm (thickness) slab sample.

[0050] 3. Heat the forged slab at 1150°C-1200°C for 1.5h-2h, then start rolling at 1150±5°C, finish rolling at 880±5°C, the thickness of the hot-rolled plate is 4-6mm, and finally air-cool to room temperature.

[0051] Table 6 Preferred alloy composition 3 of medium manganese steel in the present invention

[0052]

[0053] The hot-rolled material is subjected to heat treatment structure control, mainly ...

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Abstract

The invention discloses an ultrahigh-strength-toughness medium-manganese phase-change induced plasticity steel and a preparation method thereof. The ultrahigh-strength-toughness medium-manganese phase-change induced plasticity steel comprises, by weight, 0.35%-0.36% of C, 4.5%-7.5% of Mn, 3.2% of Al, 0.07% of P, 0.03% of S and the balance Fe. The first preparation process comprises the following steps of smelting, forging and hot rolling, and a two-phase region annealing and low-temperature tempering process; and the second preparation process comprises the following steps of smelting and forging, hot rolling and cold rolling, and a two-phase region annealing and low-temperature tempering process, the stress can be eliminated by the low-temperature tempering process, and the austenite stability is improved. The heating treatment process which is simple and high in feasibility is utilized to obtain the high-toughness advanced steel type, product of strength and elongation can reach 75 GPa%, and the performance requirements of third-generation advanced high-strength steel are met; and meanwhile, according to the preparation method, the content of C (close to 0.4wt.%) is properly increased, and the purposes aim at improving the austenite content at room temperature and ensuring full proceeding of the TRIP effect through element distribution ; and a small amount of Mn and Al elements are added into the components, and other precious alloy elements are not added, so that the production cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of advanced high-strength steel, belonging to the technical field of high-strength steel preparation. Background technique [0002] Transformation Induced Plasticity (TRIP) steel utilizes metastable austenite deformation process to induce martensitic phase transformation, which improves the strength and effectively improves the toughness of the material. The medium manganese TRIP steel has a certain strength and good plasticity. , which is an advanced steel type that is currently researched more hotly. It mainly uses a large number of metastable austenite structures with different stability levels in the structure to induce martensitic transformation during the deformation process and improve material strength; at the same time, martensite The phase transformation releases and redistributes the stress concentration during the deformation process, effectively improving the toughness of the material. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C21D2211/005C22C38/04C22C38/06
Inventor 黄兴民王彦华张雷郭远博
Owner SOUTHWEST JIAOTONG UNIV
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