两相区退火温度对汽车用0.2C-8Mn-2Al钢组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.09.040

金属热处理 ›› 2024, Vol. 49 ›› Issue (9): 247-250.DOI: 10.13251/j.issn.0254-6051.2024.09.040

两相区退火温度对汽车用0.2C-8Mn-2Al钢组织与力学性能的影响

曹中玉¹, 贾华坡^1,2, 赵保伟¹

1.郑州科技学院机械工程学院, 河南郑州 450000;
2.河南工业大学机电工程学院, 河南郑州 450001

收稿日期:2024-03-06 修回日期:2024-07-22 出版日期:2024-09-25 发布日期:2024-10-29
作者简介:曹中玉(1985—),女,高级工程师,硕士,主要研究方向为材料力学,E-mail: zzkjxyxiaoyu888@163.com
基金资助:
河南省高等学校重点科研项目(24B460030)

Effect of intercritical annealing temperature on microstructure and mechanical properties of 0.2C-8Mn-2Al steel for auto

Cao Zhongyu¹, Jia Huapo^1,2, Zhao Baowei¹

1. School of Mechanical Engineering, Zhengzhou University of Science and Technology, Zhengzhou Henan 450000, China;
2. School of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou Henan 450001, China

Received:2024-03-06 Revised:2024-07-22 Online:2024-09-25 Published:2024-10-29

摘要/Abstract

摘要： 采用扫描电镜(SEM)、拉伸试验等手段研究了两相区退火温度对热轧态0.2C-8Mn-2Al钢微观组织与力学性能的影响。结果表明,退火态0.2C-8Mn-2Al钢组织主要为奥氏体和铁素体。在780~900 ℃区间内,随着退火温度的升高,拉伸前后0.2C-8Mn-2Al钢的奥氏体转变体积分数逐渐提高,0.2C-8Mn-2Al钢的抗拉强度、伸长率和强塑积先升高后降低。900 ℃退火的0.2C-8Mn-2Al钢的奥氏体转变体积分数最高,达到43.4%,840 ℃退火的0.2C-8Mn-2Al钢的抗拉强度、伸长率和强塑积均达到最大值,分别为1208.6 MPa、31.2%和37.71 GPa·%,840 ℃为热轧态0.2C-8Mn-2Al钢的最佳退火温度。

关键词: 0.2C-8Mn-2Al钢, 两相区退火, 微观组织, 力学性能

Abstract: Effects of intercritical annealing temperature on the microstructure and mechanical properties of hot rolled 0.2C-8Mn-2Al steel were studied by using scanning electron microscope (SEM) and tensile testing. The results show that microstructure of the annealed 0.2C-8Mn-2Al steel is mainly composed of austenite and ferrite. In the range of 780 ℃ to 900 ℃, with the increase of annealing temperature, the volume fraction of austenite transformation in the 0.2C-8Mn-2Al steel before and after stretching gradually increases. Meanwhile, the tensile strength, elongation and product of strength and elongation of the 0.2C-8Mn-2Al steel first increase and then decrease. The austenite transformation volume fraction of the 0.2C-8Mn-2Al steel annealed at 900 ℃ is the highest, reaching 43.4%. The tensile strength, elongation and product of strength and elongation of the 0.2C-8Mn-2Al steel annealed at 840 ℃ reach maximum values, which are 1208.6 MPa, 31.2% and 37.71 GPa·%, respectively. 840 ℃ is the optimal annealing temperature for the hot rolled 0.2C-8Mn-2Al steel.

Key words: 0.2C-8Mn-2Al steel, intercritical annealing, microstructure, mechanical properties

中图分类号:

TG161

曹中玉, 贾华坡, 赵保伟. 两相区退火温度对汽车用0.2C-8Mn-2Al钢组织与力学性能的影响[J]. 金属热处理, 2024, 49(9): 247-250.

Cao Zhongyu, Jia Huapo, Zhao Baowei. Effect of intercritical annealing temperature on microstructure and mechanical properties of 0.2C-8Mn-2Al steel for auto[J]. Heat Treatment of Metals, 2024, 49(9): 247-250.

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两相区退火温度对汽车用0.2C-8Mn-2Al钢组织与力学性能的影响

Effect of intercritical annealing temperature on microstructure and mechanical properties of 0.2C-8Mn-2Al steel for auto

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