GCr15SiMn轴承钢表面超声滚压处理改性分析  

Analysis on Surface Modification of GCr15SiMn Bearing Steel by Ultrasonic Rolling Treatment

作　　者：宫崟翔 潘金芝[1,2] 陈春焕[1,2] 赵秀娟[1,2] 任瑞铭[1,2] GONG Yinxiang;PAN Jinzhi;CHEN Chunhuan;ZHAO Xiujuan;REN Ruiming(School of Material Science and Engineering;Key Laboratory of Key Material of Rail Transit in Liaoning Province,Dalian JiaoTong University,Dalian 116028,China)

机构地区：[1]大连交通大学材料科学与工程学院 [2]大连交通大学辽宁省轨道交通关键材料重点实验室,辽宁大连116028

出　　处：《轴承》2021年第6期21-25,共5页Bearing

基　　金：大连市科技创新基金项目(2019J11CY016)。

摘　　要：使用HK30数控车床对GCr15SiMn轴承钢进行表面超声滚压处理,利用金相显微镜和扫描电镜观察试样超声滚压前后表面形貌和截面组织,并对比分析了超声滚压处理前后试样的硬度、表面粗糙度和残余应力。研究结果表明:超声滚压处理后,试样表面显微组织发生明显的塑性变形,形成约1μm的塑性变形层;试样平均表面粗糙度Ra值降低,表面更加平整,表面硬度和表面残余压应力升高;超声滚压处理改变了表面压应力的分布规律,即试样的残余压应力最大值都不在表面,而在次表面,残余压应力作用层由100μm增加至700μm。The surface of GCr15SiMn bearing steel is subjected to ultrasonic rolling treatment using HK30 CNC lathe.Metallographic microscope and scanning electron microscope are used to observe the surface morphology and cross-sectional structure of sample before and after ultrasonic rolling,and the hardness,surface roughness and residual stress of sample before and after ultrasonic rolling are comparatively analyzed.The research results show that:after ultrasonic rolling treatment,the surface layer microstructure of sample undergoes significant plastic deformation,forming a plastic deformation layer of about 1μm;the average surface roughness value Ra of sample decreases,the surface is smoother,the surface hardness and surface residual compressive stress increase;the ultrasonic rolling treatment changes the distribution law of surface compressive stress,and the maximum value of residual compressive stress of sample is not on outermost surface,but on subsurface,the residual compressive stress layer increases from 100μm to 700μm.

关 键 词：滚动轴承 高碳铬轴承钢 超声波滚压 硬度 表面粗糙度 残余应力 

分 类 号：TH133.33[机械工程—机械制造及自动化] TG142.1[一般工业技术—材料科学与工程]