亚温淬火-回火组织对18CrNiMo7-6齿轮钢疲劳性能的影响

doi:10.13251/j.issn.0254-6051.2020.11.005

金属热处理 ›› 2020, Vol. 45 ›› Issue (11): 19-25.DOI: 10.13251/j.issn.0254-6051.2020.11.005

亚温淬火-回火组织对18CrNiMo7-6齿轮钢疲劳性能的影响

李云昆^1,2, 周芸¹, 时捷², 尉文超², 何肖飞², 胡芳忠³, 王毛球²

1.昆明理工大学材料科学与工程学院, 云南昆明 650093;
2.钢铁研究总院特殊钢研究所, 北京 100081;
3.马鞍山钢铁股份有限公司技术中心, 安徽马鞍山 243000

收稿日期:2020-04-17 出版日期:2020-11-25 发布日期:2020-12-29
通讯作者: 王毛球,教授级高工,博士,E-mail: wangmaoqiu@nercast.com
作者简介:李云昆(1993—),男,硕士研究生,主要研究方向为结构钢的疲劳性能,E-mail: liyunkun0401@163.com。
基金资助:
国家重点研发计划(2016YFB0300102)

Effect of intercritical quenched and tempered microstructure on fatigue properties of 18CrNiMo7-6 gear steel

Li Yunkun^1,2, Zhou Yun¹, Shi Jie², Yu Wenchao², He Xiaofei², Hu Fangzhong³, Wang Maoqiu²

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China;
3. Technical Center, Maanshan Iron and Steel Company Limited, Maanshan Anhui 243000, China

Received:2020-04-17 Online:2020-11-25 Published:2020-12-29

摘要/Abstract

摘要： 以不同厂家生产的两炉18CrNiMo7-6齿轮钢(标记为IQ-T-1、IQ-T-2)为研究对象,分析了试验钢经亚温淬火-回火(Intercritical quenching and tempering,IQ-T)处理后的显微组织对其力学性能、旋转弯曲疲劳性能和疲劳裂纹扩展行为的影响。结果表明:IQ-T-1试验钢的强度和疲劳强度较IQ-T-2试验钢分别提高了97 MPa和96 MPa,具有更好的力学性能和疲劳性能。IQ-T-1试验钢组织为细小铁素体+小块马氏体+回火马氏体,而IQ-T-2试验钢组织为粗大铁素体+回火马氏体。IQ-T-1试验钢中细小铁素体+小块马氏体使裂纹分枝、裂纹闭合和应力屏蔽现象均更为显著,对裂纹萌生和扩展的阻碍作用更大。

关键词: 亚温淬火, 显微组织, 旋转弯曲疲劳, 裂纹扩展, 闭合效应

Abstract: Taking 18CrNiMo7-6 gear steels (marked as IQ-T-1, IQ-T-2) produced by two different manufacturers as the research object, the effect of microstructure after intercritical quenching and tempering (IQ-T) on the mechanical properties, rotating bending properties and fatigue crack propagation behavior was analyzed. The results show that the IQ-T-1 tested steel has better strength and fatigue properties than that of the IQ-T-2 tested steel, with the strength and fatigue strength increased by about 97 MPa and 96 MPa respectively. The microstructure of the IQ-T-1 tested steel is composed of fine ferrite+small martensite+tempered martensite, while that of the IQ-T-2 tested steel is composed of coarse ferrite+tempered martensite. Fine ferrite+small martensite in the IQ-T-1 tested steel make the crack branching, crack closure and stress shielding phenomena more significant, giving rise to more inhibition of crack initiation and propagation.

Key words: intercritical quenching, microstructure, rotating bending fatigue, crack propagation, crack closure effect

中图分类号:

TG142.1

李云昆, 周芸, 时捷, 尉文超, 何肖飞, 胡芳忠, 王毛球. 亚温淬火-回火组织对18CrNiMo7-6齿轮钢疲劳性能的影响[J]. 金属热处理, 2020, 45(11): 19-25.

Li Yunkun, Zhou Yun, Shi Jie, Yu Wenchao, He Xiaofei, Hu Fangzhong, Wang Maoqiu. Effect of intercritical quenched and tempered microstructure on fatigue properties of 18CrNiMo7-6 gear steel[J]. Heat Treatment of Metals, 2020, 45(11): 19-25.

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亚温淬火-回火组织对18CrNiMo7-6齿轮钢疲劳性能的影响

Effect of intercritical quenched and tempered microstructure on fatigue properties of 18CrNiMo7-6 gear steel

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