22MnB5钢淬火晶粒控制与拉伸性能研究

doi:10.13251/j.issn.0254-6051.2020.11.025

金属热处理 ›› 2020, Vol. 45 ›› Issue (11): 138-143.DOI: 10.13251/j.issn.0254-6051.2020.11.025

22MnB5钢淬火晶粒控制与拉伸性能研究

李素云¹, 裴一丁¹, 李琦¹, 徐沛瑶², 宫秀勉², 闵永安¹

1.上海大学材料科学与工程学院省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200444;
2.上海汇众汽车制造有限公司, 上海 201206

收稿日期:2020-04-19 出版日期:2020-11-25 发布日期:2020-12-29
通讯作者: 闵永安,副教授,博士,E-mail:mya@staff.shu.edu.cn
作者简介:李素云(1994—),女,硕士研究生,主要研究方向为金属材料及热处理等,E-mail:suyunlee@163.com。
基金资助:
国家自然科学基金(51075307,51375346)

Research on quenching grain control and tensile properties of 22MnB5 steel

Li Suyun¹, Pei Yiding ¹, Li Qi¹, Xu Peiyao², Gong Xiumian², Min Yong'an¹

1. State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
2. Shanghai Huizhong Automobile Manufacturing Co., Ltd., Shanghai 201206, China

Received:2020-04-19 Online:2020-11-25 Published:2020-12-29

摘要/Abstract

摘要： 为改善热成形钢的强塑性,利用DIL805A热膨胀仪将22MnB5钢加热至830~920 ℃、保温2~20 min奥氏体化后淬火,在光学显微镜下观察了原奥氏体晶粒。根据晶粒长大特点,对22MnB5钢板进行淬火、回火处理后,通过单轴拉伸试验检测了其拉伸性能。结果表明,该22MnB5钢在830~890 ℃、有效保温10 min以内,可以获得均匀细小的奥氏体晶粒;有效保温时间延长至20 min时,860 ℃奥氏体化便开始出现混晶。与传统热成形相比,通过控制淬火晶粒显著改善了22MnB5钢的强塑性,强塑积由9.0~11.0 GPa·%提高至13.0~14.5 GPa·%。

关键词: 22MnB5钢, 淬火-回火, 晶粒度, 强塑积

Abstract: To improve the strength and plasticity of the hot stamping steel, the 22MnB5 steel was heated at 830-920 ℃ by a DIL805A thermal dilatometer and held for 2-20 min, and then quenched after austenitizing. The prior austenite grains were observed by optical microscope. According to the characteristics of grain growth, the tensile properties of the 22MnB5 steel plate were tested by uniaxial tensile test after quenching and tempering. The results show that uniformly fine austenite grains can be obtained by austenitizing at 830-890 ℃ and within 10 min of effective holding for the 22MnB5 steel. While when the effective holding time is extended to 20 min, the mixed grain microstructure begins to appear when austenitized at 860 ℃. Compared with the traditional hot stamping process, the strength and plasticity of 22MnB5 steel is significantly improved by controlling the quenching grains, and the product of strength and elongation increases from 9.0-11.0 GPa·% to 13.0-14.5 GPa·%.

Key words: 22MnB5 steel, quenching and tempering, grain size, product of strength and elongation

中图分类号:

TG142.1

李素云, 裴一丁, 李琦, 徐沛瑶, 宫秀勉, 闵永安. 22MnB5钢淬火晶粒控制与拉伸性能研究[J]. 金属热处理, 2020, 45(11): 138-143.

Li Suyun, Pei Yiding, Li Qi, Xu Peiyao, Gong Xiumian, Min Yong'an. Research on quenching grain control and tensile properties of 22MnB5 steel[J]. Heat Treatment of Metals, 2020, 45(11): 138-143.

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22MnB5钢淬火晶粒控制与拉伸性能研究

Research on quenching grain control and tensile properties of 22MnB5 steel

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