电脉冲对9SiCr钢超声滚压表面性能的影响  

Effect of Electropulsing on Surface Mechanical Behavior of 9SiCr Steel During Ultrasonic Rolling Process

作　　者：徐梓真 赵天永 彭绍坤 王猛 赵洪甲 宁腾飞 马浩阳 吴鹤 XU Zizhen;ZHAO Tianyong;PENG Shaokun;WANG Meng;ZHAO Hongjia;NING Tengfei;MA Haoyang;WU He(Shijiazhuang Haishan Industrial Development Corporation,Shijiazhuang 050200,China)

机构地区：[1]石家庄海山实业发展总公司,石家庄050200

出　　处：《表面技术》2024年第19期186-192,共7页Surface Technology

摘　　要：目的提高9SiCr钢表面硬度、光洁度,获得更好的表面质量。方法对9SiCr钢棒状试样进行车削加工,然后分别进行不同参数下的超声滚压(USRP)和高能电脉冲辅助超声滚压(EP-USRP)加工。通过表面粗糙度测试、微观形貌分析、表层显微维氏硬度测试,分别评价不同加工状态试样的表面粗糙度、表面形貌、表层一定深度内的硬度梯度分布,并通过光学显微镜和扫描电子显微镜对试样表层形貌进行分析。结果车削后试样的表面粗糙度为0.45μm,经施加压力为1000 N的USRP加工后,试样表面粗糙度为0.043μm,对试样进行EP-USRP加工,当均方根电流密度为0.71 A/mm^(2)时,表面粗糙度降至0.032μm,比单纯USRP加工后试样的表面粗糙度降低了25.6%。经车削后,试样的显微维氏硬度约为550HV,经施加压力为800 N的USRP加工后,试样表层硬度为590HV。当对试样施加均方根电流密度为0.71 A/mm^(2)的EP-USRP处理后,其硬度为612HV,比USRP加工后的硬度增加了3.8%。从硬化层深度来看,经USRP加工后试样径向表层到心部大概有300μm得到硬化,而经EP-USRP加工后硬化层的深度可以增至400μm。从微观形貌分析可以看出,试样表层具有一定深度的细晶层,随着加工状态的不同,晶粒大小和细晶层深度也不同。结论采用USRP、EP-USRP加工都可以在一定程度上提高9SiCr钢的表面质量,电脉冲可以提高USRP加工的效果,进一步提高表面质量。In order to improve the surface hardness and finish of 9SiCr steel and obtain better surface quality,the rod-shaped samples of 9SiCr steel were turned,and then processed by ultrasonic rolling process(USRP)and high-energy electrical pulse-assisted ultrasonic rolling process(EP-USRP)with different parameters.Through surface roughness test,micro-topography test,surface Vickers microhardness test,the surface roughness,surface topography,and surface hardness gradient distribution in a certain depth of the surface of the samples in different processing conditions were evaluated respectively.The surface topography of the samples was analyzed by optical microscope and scanning electron microscope.The results showed that the surface topography of the turned samples was poor.The surface undulation was more obvious and the surface roughness was 0.45μm.When USRP was applied,the surface quality of the samples was greatly improved,and the surface roughness was 0.043μm when the pressure was 1000 N.When the pressure continued to increase,the improvement of surface quality was no longer obvious.When the samples were processed by EP-USRP,it could be seen that the surface quality of the samples was be further improved.When the root mean square current density was 0.71 A/mm^(2),the surface roughness decreased to the minimum of 0.032μm,which was 25.6%lower than that after USRP processing alone.The micro-hardness value of the turned samples was around 550HV.When USRP was applied,the surface hardness value of the samples was significantly increased,and the maximum value of 590HV was found when the processing pressure was 800 N,which was 7.3%higher than that of the turned samples.When the sample was processed by EP-USRP,the hardening effect of the surface layer of the sample was more obvious,which was embodied in the increase of the hardness value and the depth of the effect layer.When the root mean square current density was 0.71 A/mm^(2),the maximum value of the Vickers microhardness was 612HV,which was 3.8%higher than the maximum

关 键 词：电脉冲 超声滚压 9SICR钢 粗糙度 显微硬度 表面质量 

分 类 号：TG668[金属学及工艺—金属切削加工及机床]