Effect of Deep Cryogenic Treatment on Mechanical Property and Microstructure of a Low Carbon High Alloy Martensitic Bearing Steel during Tempering

被引：5

作者：

Li D. ^{[1
]}

Li Z. ^{[2
]}

Xiao M. ^{[1
]}

Li S. ^{[1
]}

Zhao K. ^{[1
]}

Yang M. ^{[3
]}

机构：

[1] School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming

[2] Yunnan College of Business Management, Kunming

[3] Institute for Special Steels, Central Iron and Steel Research Institute, Beijing

来源：

Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2019年 / 33卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Carbide; Deep cryogenic treatment; High alloy steel; Metallic materials; Retained austenite;

D O I：

10.11901/1005.3093.2019.095

中图分类号：

学科分类号：

摘要：

The hardness and microstructure evolution of a low carbon and high alloy martensite bearing steel after deep cryogenic treatment were studied by means of Rockwell hardness tester, X-ray diffractometer, and scanning electron microscope and transmission electron microscope. The results show that the deep cryogenic treatment promotes the transformation of retained austenite to martensite, which leads to an increase in the hardness after quenching. In addition, the hardness of the steel subjected to deep cryogenic treatment was higher than that of the non-cryogenically treated one during tempering. The deep cryogenic treatment causes the carbon atoms in the steel to segregate and precipitate as carbides during the tempering process. Compared with the steel without deep cryogenic treatment, the carbon content in the martensite matrix of the steel subjected to deep cryogenic treatment was lower after tempering, which indicated that more carbides were precipitated in the deep cryogenic treated steel during the tempering process. According to the results of transmission electron microscope images, a large number of nanosized M2C and M6C carbides precipitated from the martensite matrix during tempering, which may be the main reason for the maintenance of high hardness of the steel after longtime tempering. © All right reserved.

引用

页码：561 / 571

页数：10

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