层流等离子体淬火对GCr15轴承钢的滚动接触疲劳及损伤性能的影响  

Effect of Laminar Plasma Quenching on Rolling Contact Fatigue and Damage Performance of GCr15 Bearing Steel

作　　者：闵军雄 张敏男 戴光泽[1] 赵君文[1] MIN Junxiong;ZHANG Minnan;DAI Guangze;ZHAO Junwen(School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学材料科学与工程学院,成都610031

出　　处：《材料导报》2023年第2期169-175,共7页Materials Reports

基　　金：国家重点研发计划(2018YFB1201702-04)。

摘　　要：为了提高GCr15轴承钢的滚动接触疲劳(RCF)性能,使用层流等离子体淬火(LPQ)技术对GCr15轴承钢表面进行了四种不同扫描速度(350 mm/min、550 mm/min、750 mm/min、950 mm/min)的等离子体淬火实验。用MJP-30滚动接触疲劳实验机对处理前后的试样进行RCF试验。采用激光共聚焦显微镜(VK-9710)、超景深显微镜(UDM,VHX-1000C,Japan)、扫描电子显微镜分析试样组织结构、成分、微观损伤形貌,对试样进行硬度测试,分析疲劳扩展机理。结果表明:由于LPQ的冷却速率及加热速率较快,试样表面产生淬火硬化区,形成细小的隐晶马氏体组织,表层硬度增大。硬化层厚度影响RCF扩展机理,硬化层厚度越深,疲劳寿命越长,LPQ使RCF寿命延长64%。In order to improve the rolling contact fatigue(RCF)performance of GCr15 bearing steel,four plasma quenching experiments with different scanning speeds(350 mm/min,550 mm/min,750 mm/min,950 mm/min)were carried out on the surface of GCr15 bearing steel by laminar plasma quenching(LPQ).The MJP-30 rolling contact fatigue testing machine was used to conduct RCF tests on the samples before and after the treatment.The laser confocal microscope(VK-9710),super depth of field microscope(UDM,VHX-1000C,Japan)and scanning electron microscope were used to analyze the microstructure,composition and microscopic damage morphology of the samples.The hardness of the samples was tested,and the fatigue propagation mechanism was analyzed.The results show that due to the rapid cooling rate and heating rate of LPQ,hardening zone was formed on the surface of the sample,and thus fine cryptocrystalline martensite structure was formed,which increased the surface hardness.The hardening layer thickness affects the RCF propagation mechanism.The deeper the hardening layer thickness is,the longer the fatigue life is.LPQ can increase the RCF life by 64%.

关 键 词：层流等离子体淬火(LPQ) GCR15轴承钢 滚动接触疲劳(RCF) 裂纹扩展 

分 类 号：TH117.1[机械工程—机械设计及理论]