冷轧对M50钢马氏体/贝氏体复相组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2020.11.023

金属热处理 ›› 2020, Vol. 45 ›› Issue (11): 126-131.DOI: 10.13251/j.issn.0254-6051.2020.11.023

冷轧对M50钢马氏体/贝氏体复相组织与力学性能的影响

贺元庚^1,2,3, 刘雨健⁴, 夏云志⁴, 钱东升^1,2,3, 王丰^1,2,3

1.武汉理工大学材料科学与工程学院, 湖北武汉 430070;
2.湖北省材料绿色精密成形工程技术研究中心, 湖北武汉 430070;
3.湖北省汽车零部件重点实验室, 湖北武汉 430070;
4.中国航发哈尔滨轴承有限公司, 黑龙江哈尔滨 150500

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: 钱东升,教授,博士,E-mail:qiands@whut.edu.cn
作者简介:贺元庚(1994—),男,硕士研究生,主要研究方向为高性能轴承精密成形制造工艺,E-mail:hyg199507@163.com。
基金资助:
国家自然科学基金(51875426,51805390);教育部创新团队发展计划(IRT_17R83);高等学校学科创新引智计划(B17034)

Effect of cold rolling on M/B duplex microstructure and mechanical properties of M50 steel

He Yuangeng^1,2,3, Liu Yujian⁴, Xia Yunzhi⁴, Qian Dongsheng^1,2,3, Wang Feng^1,2,3

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan Hubei 430070, China;
2. Hubei Engineering Research Center for Green & Precision Material Forming, Wuhan Hubei 430070, China;
3. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan Hubei 430070, China;
4. Harbin Bearing Company of AECC Group, Harbin Heilongjiang 150500, China

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

摘要/Abstract

摘要： 利用X射线衍射仪(XRD) 、扫描电镜(SEM) 、透射电镜(TEM)、室温拉伸和冲击性能测试研究了冷轧对M50钢马氏体/贝氏体(M/B)复相组织和性能的影响。结果表明:20%冷轧变形量的试样经等温淬火后具有最佳的抗拉强度(2535.7 MPa)和冲击性能(96.93 J),相比变形量为0%的试样,冲击吸收能量提高了约21%,抗拉强度提高了约5%。当变形量小于20%时,随着变形量的增加,M/B复相组织逐渐细化且在20%的冷轧变形量下组织最细;当变形量大于20%时,随着变形量的增加,贝氏体束减少,其对马氏体板条的分割作用减弱,导致组织呈现一定的粗化。

关键词: M50钢, 冷轧, 等温淬火, 马氏体/贝氏体复相组织, 力学性能

Abstract: Effect of cold rolling on the M/B duplex microstructure and mechanical properties of M50 steel was investigated by means of X-ray diffraction, scanning and transmission electron microscopy, uniaxial tensile and Charpy impact tests. The results show that an excellent combination of ultimate tensile strength (2535.7 MPa) and impact property (96.93 J) is achieved by combining 20% cold rolling with austempering, of which the ultimate tensile strength increases by about 5% whereas the impact absorbed energy increases by about 21% compared with the specimen which is not cold rolled. The microstructure observation indicates that with the increase of cold rolling deformation (<20%), the microstructure becomes finer and the specimen with 20% cold rolling deformation shows the finest microstructure. However, when a higher cold rolling deformation (>20%) is applied, the amount of bainite sheaves decreases, which weakens the refinement of martensite and leads to some coarsening of microstructure.

Key words: M50 steel, cold rolling, austempering, M/B duplex microstructure, mechanical properties

中图分类号:

TG162.6

贺元庚, 刘雨健, 夏云志, 钱东升, 王丰. 冷轧对M50钢马氏体/贝氏体复相组织与力学性能的影响[J]. 金属热处理, 2020, 45(11): 126-131.

He Yuangeng, Liu Yujian, Xia Yunzhi, Qian Dongsheng, Wang Feng. Effect of cold rolling on M/B duplex microstructure and mechanical properties of M50 steel[J]. Heat Treatment of Metals, 2020, 45(11): 126-131.

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冷轧对M50钢马氏体/贝氏体复相组织与力学性能的影响

Effect of cold rolling on M/B duplex microstructure and mechanical properties of M50 steel

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