| 亚温淬火-回火组织对18CrNiMo7-6齿轮钢疲劳性能的影响 |
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| 引用本文： | 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. DOI: 10.13251/j.issn.0254-6051.2020.11.005 |
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| 作者姓名： | 李云昆 周芸 时捷 尉文超 何肖飞 胡芳忠 王毛球 |
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| 作者单位： | 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 |
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| 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。
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| 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 |
| 收稿时间： | 2020-04-17 |
Effect of intercritical quenched and tempered microstructure on fatigue properties of 18CrNiMo7-6 gear steel |
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| 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. DOI: 10.13251/j.issn.0254-6051.2020.11.005 |
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| Authors: | Li Yunkun Zhou Yun Shi Jie Yu Wenchao He Xiaofei Hu Fangzhong Wang Maoqiu |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | intercritical quenching microstructure rotating bending fatigue crack propagation crack closure effect |
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