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材料导报  2024, Vol. 38 Issue (2): 22100180-7    https://doi.org/10.11896/cldb.22100180
  金属与金属基复合材料 |
渗碳工艺对18CrNiMo7-6合金钢缺口件疲劳性能的影响
秦盛伟*, 邸黎寅, 王连翔, 张承昊
郑州大学机械与动力工程学院,郑州 450001
Effect of Carburizing on Fatigue Properties of Notched 18CrNiMo7-6 Alloy Steel
QIN Shengwei*, DI Liyin, WANG Lianxiang, ZHANG Chenghao
School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China
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摘要 为分析渗碳工艺对18CrNiMo7-6缺口构件疲劳性能的影响,对应力集中系数Kt=1.86的缺口试样进行渗碳热处理并测定其旋转弯曲疲劳性能,同时对试样表层组织、硬度以及应力场进行了表征。结果表明,渗碳热处理可以明显提升试样表面硬度并引入残余压应力,并且可以显著提升缺口试样的疲劳性能,相较于未渗碳试样疲劳极限提升超过100%;随着有效硬化层深度的增加,缺口试样的疲劳极限均呈现先增后减的趋势。未渗碳试样和渗碳试样的疲劳源均在缺口根部表面处,且均为多源断裂。疲劳过程中渗碳试样表面残余奥氏体在循环应力作用下诱导马氏体相变,其转变量存在一个临界值。
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秦盛伟
邸黎寅
王连翔
张承昊
关键词:  18CrNiMo7-6合金钢  应力集中  渗碳热处理工艺  高周疲劳性能    
Abstract: In order to analyze the effect of carburizing process on the fatigue properties of the 18CrNiMo7-6 notched specimens, the notched specimens with stress concentration factor Kt=1.86 were carburized and then these rotating bending fatigue properties were measured. The microstructure, hardness and stress field of the specimens were characterized. The results show that carburizing heat treatment can significantly promote the surface hardness of the sample and introduce residual compressive stress. The fatigue limit of the notched samples is increased more than 100% compared with the uncarburized samples. With the increase of the depth of effective hardening layer, the fatigue limit of notched specimens increases first and then decreases. The fatigue sources of the uncarburized and carburized specimens are at the surface of notch root, and both of them are multi-source fracture. During fatigue, martensitic transformation of the retained austenite takes place on the surface of carburized specimen, and there is a critical value for its transformation.
Key words:  18CrNiMo7-6 alloy steel    stress concentration    carburizing heat treatment process    high cycle fatigue performance
出版日期:  2024-01-25      发布日期:  2024-01-26
ZTFLH:  TG156  
基金资助: 国家自然科学基金(52001281;U1804254);河南省科技攻关项目(192102210012)
通讯作者:  *秦盛伟,郑州大学机械与动力工程学院讲师、硕士研究生导师。2011年于东北大学材料冶金学院本科毕业,2017年于上海交通大学材料科学与工程专业博士毕业后到郑州大学工作至今。目前主要从事高强钢以及热处理等方面的研究工作。发表论文10余篇,包括Journal of Materials Research and Technology、Metallurgical and Materials Transactions A、Materials Science and Engineering A等。qinsw@zzu.edu.cn   
引用本文:    
秦盛伟, 邸黎寅, 王连翔, 张承昊. 渗碳工艺对18CrNiMo7-6合金钢缺口件疲劳性能的影响[J]. 材料导报, 2024, 38(2): 22100180-7.
QIN Shengwei, DI Liyin, WANG Lianxiang, ZHANG Chenghao. Effect of Carburizing on Fatigue Properties of Notched 18CrNiMo7-6 Alloy Steel. Materials Reports, 2024, 38(2): 22100180-7.
链接本文:  
https://www.mater-rep.com/CN/10.11896/cldb.22100180  或          https://www.mater-rep.com/CN/Y2024/V38/I2/22100180
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