水射流喷丸预处理对42CrMo钢氮化后接触疲劳性能的影响
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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。
The effects of water jet shot peening pretreatment on rolling contact fatigue properties of 42 CrMo 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 42 CrMo steel after nitriding is enhanced.
The effects of water jet shot peening pretreatment on rolling contact fatigue properties of 42 CrMo 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 42 CrMo steel after nitriding is enhanced.
引文
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21 Dou P,Suo S F,Bai B Z,et al.Journal of Iron and Steel Research International,2008,15(3),37.
22 Richardson A D,Evans M H,Wang L,et al.Tribology Letters,2018,66(1),6.
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