水射流喷丸预处理对42CrMo钢氮化后接触疲劳性能的影响

doi:10.11896/cldb.18080059

材料导报

2019, Vol. 33

Issue (18): 3107-3112 https://doi.org/10.11896/cldb.18080059

金属与金属基复合材料

水射流喷丸预处理对42CrMo钢氮化后接触疲劳性能的影响

黎国猛^{1, 2, 3}, 梁益龙^{1, 2, 3,}, 范航京^{1, 2, 3}, 张雄菲^{1, 2, 3}, 朱勇^{1, 2, 3}

1 贵州大学材料与冶金学院,贵阳 550025
2 贵州省材料结构与强度重点实验室,贵阳 550025
3 贵州大学高性能金属结构材料与制造技术国家地方联合工程实验室,贵阳 550025

Effects of Water Jet Shot Peening Pretreatment on Contact Fatigue Properties of 42CrMo Steel After Plasma Nitriding

LI Guomeng^1,2,3, LIANG Yilong^1,2,3, FAN Hangjing^1,2,3, ZHANG Xiongfei^1,2,3, ZHU Yong^1,2,3

1 College of Materials and Metallurgy, Guizhou University, Guiyang 550025
2 Key Laboratory for Material Structure and Strength of Guizhou Province, Guiyang 550025
3 National local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacturing Technology, Guizhou University, Guiyang 550025

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摘要利用高压水射流喷丸技术(WSP)和真空脉冲等离子氮化技术,研究了水射流喷丸预处理对42CrMo钢等离子氮化后的滚动接触疲劳性能的影响。采用OM、SEM、TEM、XRD应力测定仪、表面粗糙度仪、显微硬度仪对等离子氮化和复合处理后试样的渗层显微组织、结构以及表面完整性进行了表征,并对疲劳断口形貌进行了分析。结果表明:经过WSP预处理后,42CrMo钢获得了更好的氮化效果,疲劳性能得到大幅提升。原因是经WSP预处理后,试样表面细小弥散的氮化物和表层晶粒的细化有利于抑制表面裂纹的萌生与扩展,改变了疲劳裂纹的萌生机制,次表层硬度的提高以及更深的残余压应力影响层推迟了次表层裂纹的萌生,更高的次表层残余压应力抑制了次表层二次裂纹的萌生以及主裂纹的扩展,延长了42CrMo钢渗氮后的接触疲劳寿命,使得失效机理更接近于赫兹理论。

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	黎国猛
	梁益龙
	范航京
	张雄菲
	朱勇

关键词: 金属材料 42CrMo钢接触疲劳性能表面完整性水射流喷丸渗氮

Abstract: The effects of water jet shot peening pretreatment on rolling contact fatigue properties of 42CrMo steel after plasma nitriding were studied. The WSP+plasma nitriding was explored by using water jet shot peening at high pressure technology and vacuum pulse plasma nitriding technology. The microstructure, surface integrity and fatigue fracture morphologies of surface-treated specimens were characterized using optical microscope, scanning electron microscope, transmission electron microscope, XRD residual stress tester, surface roughness tester and microhardness tester. The results show that the rolling contact fatigue properties of the pre-WSPed samples were obviously enhanced, which can be mainly attributed to a much better nitriding results it got after WSP pretreatment. The fine well-distributed nitrides and the grain refinement of surface are favorable for suppressing the initiation and propagation of vertical short cracks, which changes the mechanism of crack initiation. The deeper hardness and residual stress gradient delay the initiation of subsurface cracks. The higher residual compress stress suppresses the initiation of branched cracks and the propagation of subsurface main cracks. Therefore, the failure mechanism is closer to Hertz theory, and the fatigue life of 42CrMo steel after nitriding is enhanced.

Key words: metallic materials 42CrMo steel contact fatigue properties surface integrity water jet shot peening nitriding

出版日期: 2019-09-25 发布日期: 2019-07-31

ZTFLH:

TG668

基金资助: 国家自然科学基金(51671060);贵州省科技计划项目(黔科合JZ字[2014]2003; 黔科合重大专项字(2014)6012)

通讯作者: liangyilong@126.com

作者简介: 黎国猛,贵州大学材料科学与工程专业在读硕士,主要研究方向为化学热处理。
梁益龙,贵州大学教授,博士生导师,享受国务院政府特殊津贴。主持完成了国家自然科学基金、科技部创新基金项目等多个项目。团队主要从事方向为先进材料、化学热处理、表面功能化涂层以及摩擦磨损。

引用本文:

黎国猛, 梁益龙, 范航京, 张雄菲, 朱勇. 水射流喷丸预处理对42CrMo钢氮化后接触疲劳性能的影响[J]. 材料导报, 2019, 33(18): 3107-3112.
LI Guomeng, LIANG Yilong, FAN Hangjing, ZHANG Xiongfei, ZHU Yong. Effects of Water Jet Shot Peening Pretreatment on Contact Fatigue Properties of 42CrMo Steel After Plasma Nitriding. Materials Reports, 2019, 33(18): 3107-3112.

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http://www.mater-rep.com/CN/10.11896/cldb.18080059 或 http://www.mater-rep.com/CN/Y2019/V33/I18/3107

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