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A kind of high-performance medium manganese trip steel and the method for low-temperature processing thereof

A processing and high-performance technology, applied in the field of ultra-high-strength steel, can solve the problems of low austenite content and stability, C/Mn can not be distributed, and reduce the surface quality of stamping parts, etc., to achieve excellent mechanical properties, Effect of low molding temperature and short molding cycle

Active Publication Date: 2019-11-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems: (1) hot-rolled sheet has low yield strength (400-700MPa) and thick oxide layer, resulting in poor surface quality of stamping parts; (2) cold-rolled medium manganese steel has large The elastic modulus, although it has excellent surface quality compared with hot rolling, but due to the large rebound of medium manganese steel in the cold rolling process, the rolling efficiency is reduced; (3) In order to consider the continuity of production, the current hot stamping The austenitizing annealing time of manganese steel is often less than 10min, but the optimum heat treatment time of medium manganese steel is longer (≥30min), because the short annealing time will lead to insufficient distribution of C / Mn, austenite The content and stability are relatively low, which will reduce the surface quality of stamping parts

Method used

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  • A kind of high-performance medium manganese trip steel and the method for low-temperature processing thereof
  • A kind of high-performance medium manganese trip steel and the method for low-temperature processing thereof
  • A kind of high-performance medium manganese trip steel and the method for low-temperature processing thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A low-temperature forming method of high-performance medium-manganese TRIP steel adopts low-temperature forming process (two-phase zone rolling+warm punching) and Q&P treatment process for medium-manganese steel, and its implementation steps are as follows:

[0046] S1: rolling in two-phase area

[0047] After heating the ingot of medium manganese steel to 700°C and keeping it warm for 1 hour, roll it 9 times on a two-roller hot rolling mill. The rolling temperature is controlled at 600-700°C. Return to the furnace at 800°C and reheat for 5 minutes to obtain a rolled plate with a thickness of 1.5-2.5mm, with a total deformation of 95-97%, and then air-cool to room temperature to obtain a nano / ultra-fine two-phase region-rolled medium manganese TRIP steel plate.

[0048] The composition of the medium manganese steel is: C is 0.2wt.%, Si is 0.50wt.%, Mn is 7.00wt.%, Al is 1.50wt.%, N is 0.014wt.%, Nb is 0.06wt.%. , Mo is 0.25wt.%, and the balance is Fe and unavoidable im...

Embodiment 2

[0056] A high-performance medium manganese TRIP steel, its chemical composition and content are: C is 0.20wt.%, Si is 0.05wt.%, Mn is 5.59wt.%, Al is 1.22wt.%, N is 0.014wt. %, Nb is 0.06wt.%, Mo is 0.22wt.%, and the balance is Fe and unavoidable impurities.

[0057] The above-mentioned low-temperature processing and forming method of high-performance medium manganese TRIP steel comprises the following steps:

[0058] S1: rolling in two-phase area

[0059] After heating the cut medium-manganese steel square ingot to 800°C and keeping it warm for 1 hour, it is quickly transferred to a two-roll hot rolling mill for 8 passes of hot rolling. The rolling temperature is controlled between 600 and 700°C. After the first pass of rolling, return to the furnace at 800°C and reheat for 5 minutes, the total deformation is 97%, rolling to obtain a 1.5mm thick rolled plate, and then air-cooled to room temperature to obtain nano / ultra-fine two-phase rolled medium manganese TRIP steel plate...

Embodiment 3

[0069] A kind of high-performance medium manganese TRIP steel, its composition is the same as embodiment 2.

[0070] A low-temperature forming method of high-performance medium manganese TRIP steel, the same as embodiment 2, the difference is:

[0071] In S2 in Example 1, cut the medium-manganese TRIP steel plate rolled in the nano / ultra-fine two-phase region into a set size, put it in a heating furnace, heat it to 800 ° C, keep it for 8 minutes, and heat up the heat treatment furnace The speed is 8°C / s, and then it is quickly transferred to the stamping platform, which takes 5s, and the temperature drops to 700°C, then it is quickly stamped and formed, and the pressure is maintained for 20s, then the stamped part is removed, cooled to 200°C with the mold, and then quickly transferred to In the heating furnace, the temperature is 450°C, the temperature is kept for 10 minutes, and the air is cooled to room temperature to obtain a U-shaped high-performance medium manganese TRIP ...

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Abstract

A high-performance medium-manganese TRIP steel and its low-temperature processing and forming method belong to the technical field of ultra-high-strength steel. The method is as follows: heat the cut medium manganese steel ingot to 600-800°C and keep it for 0.5-1.5 hours, perform two-phase zone rolling, air-cooling, and then heat it to 600-800°C and keep it for 5-10 minutes to obtain austenite. The medium manganese TRIP steel plate after chemical treatment is transferred to the stamping mold, ensuring that the temperature is cooled to 50-100°C, and stamping is carried out. After holding the pressure for 10-30 seconds, it is cooled to 180-250°C with the mold, heated to 250-450°C and kept for 10 ~30 minutes, air cooling, and high-performance medium manganese TRIP steel formed parts are obtained. This method allows C / Mn to be partitioned in advance through two-phase zone rolling, and then through subsequent Q&P processing, C / Mn is partitioned again. This forming method improves the rolling efficiency and the surface quality of the stamping parts, making the prepared stamping parts high in strength and excellent in comprehensive performance, meeting the target requirements of the automotive industry.

Description

technical field [0001] The invention belongs to the technical field of ultra-high-strength steel, and in particular relates to a high-performance medium-manganese TRIP steel and a low-temperature processing and forming method thereof. Background technique [0002] Since the beginning of the 21st century, with the intensification of energy crisis and environmental problems, energy saving and safety have become the development trend of the automobile manufacturing industry. In order to achieve energy saving and emission reduction while meeting safety requirements, the application of advanced high-strength steel stamping parts for automobiles has been greatly promoted. At present, the more mature stamping material for automobiles is boron steel, such as 22MnB5. In the hot stamping process, 22MnB5 is heated to 950 ° C to obtain a full austenite structure, and then transferred to the stamping die for rapid quenching. Austenite will completely transform into martensite structure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 蔡明晖刘姗李文霞王昀鹏罗政
Owner NORTHEASTERN UNIV LIAONING
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