深冷处理对渗碳齿轮钢微观组织和硬度的影响

doi:10.13251/j.issn.0254-6051.2023.11.022

金属热处理 ›› 2023, Vol. 48 ›› Issue (11): 143-148.DOI: 10.13251/j.issn.0254-6051.2023.11.022

深冷处理对渗碳齿轮钢微观组织和硬度的影响

宋少威^1,2, 尉文超², 时捷², 王毛球², 何肖飞², 周芸¹

1.昆明理工大学材料科学与工程学院, 云南昆明 650093;
2.钢铁研究总院有限公司特殊钢研究院, 北京 100081

收稿日期:2023-06-08 修回日期:2023-10-09 出版日期:2023-11-25 发布日期:2023-12-27
通讯作者: 周芸,教授,博士,E-mail:zyuncrystal@qq.com
作者简介:宋少威(1995—),男,硕士研究生,主要研究方向为渗碳齿轮钢,E-mail:ssw_kungong@163.com。

Effect of cryogenic treatment on microstructure and hardness of carburized gear steel

Song Shaowei^1,2, Yu Wenchao², Shi Jie², Wang Maoqiu², He Xiaofei², Zhou Yun¹

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
2. Research Institute of Special Steels, Central Iron and Steel Research Institute Company Limited, Beijing 100081, China

Received:2023-06-08 Revised:2023-10-09 Online:2023-11-25 Published:2023-12-27

摘要/Abstract

摘要： 通过金相显微镜、X射线衍射仪、EBSD、维氏硬度计等手段,对20Cr2Ni4A及17Cr2Ni2MoVNb两种渗碳齿轮钢渗碳层组织及硬度进行表征,研究了深冷处理对试验钢微观组织及硬度分布的影响。结果表明,-75 ℃冷处理后两种试验钢的渗碳层最高硬度增加较明显,经-196 ℃深冷处理后试验钢的渗碳层硬度进一步增加不明显。20Cr2Ni4A钢及17Cr2Ni2MoVNb钢渗碳层残留奥氏体含量经-75 ℃冷处理后从34%和25%分别下降至19%和20%,-196 ℃深冷处理后进一步分别下降至11%和13%。20Cr2Ni4A钢中大尺寸残留奥氏体更多,冷处理后残留奥氏体含量下降趋势更明显,大尺寸残留奥氏体对渗碳层硬度有显著影响。

关键词: 渗碳齿轮钢, 深冷处理, 微观组织, 残留奥氏体, 硬度

Abstract: Microstructure and hardness of 20Cr2Ni4A and 17Cr2Ni2MoVNb carburized gear steels were characterized by means of metallographic microscope, X-ray diffractometer, EBSD and Vickers hardness tester, and the effect of cryogenic treatment on microstructure and hardness distribution of the tested steels was studied. The results show that the maximum hardness in the carburized layer of the two tested steels increases obviously after cold treatment at -75 ℃, and it increases a little further after cryogenic treatment at -196 ℃. After cold treatment at -75 ℃, the contents of retained austenite in the carburized layers of the 20Cr2Ni4A and 17Cr2Ni2MoVNb steels are decreased from 34% to 19% and 25% to 20%, respectively, and they are further decreased to 11% and 13% after cryogenic treatment at -196 ℃. There is a more amount of large-sized retained austenite in the 20Cr2Ni4A steel, which is decreased more easily after cryogenic treatment. Large-sized retained austenite has a significant effect on hardness of the carburized layer.

Key words: carburized gear steel, cryogenic treatment, microstructure, retained austenite, hardness

中图分类号:

TG156.91

宋少威, 尉文超, 时捷, 王毛球, 何肖飞, 周芸. 深冷处理对渗碳齿轮钢微观组织和硬度的影响[J]. 金属热处理, 2023, 48(11): 143-148.

Song Shaowei, Yu Wenchao, Shi Jie, Wang Maoqiu, He Xiaofei, Zhou Yun. Effect of cryogenic treatment on microstructure and hardness of carburized gear steel[J]. Heat Treatment of Metals, 2023, 48(11): 143-148.

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深冷处理对渗碳齿轮钢微观组织和硬度的影响

Effect of cryogenic treatment on microstructure and hardness of carburized gear steel

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