20CrMnMo钢齿轮开裂原因分析  

Analysis on Cause of 20CrMnMo Steel Gear Cracking

作　　者：朱晓红 唐三兵 胡长春 漆凌 ZHU Xiaohong;TANG Sanbin;HU Changchun;QI Ling(Wuxi Business Testing Technology Co.,Ltd.,Wuxi 214104,Jiangsu China;Wuxi Institute of Inspection,Testing and Certification,Wuxi 214101,JiangsuChina)

机构地区：[1]无锡商测检测技术有限公司,江苏无锡214104 [2]无锡市检验检测认证研究院,江苏无锡214101

出　　处：《热处理》2022年第4期43-45,共3页Heat Treatment

摘　　要：经过渗碳、淬火、回火及再次高频感应淬火和回火的20CrMnMo钢齿轮,在磨削后发现齿面有纵向裂纹。对开裂的齿轮进行了化学成分分析、金相检验和硬度测定,以揭示其开裂的原因。结果表明:齿轮高频感应淬火后的回火不充分因而残余应力较大,且磨削工艺不当,导致齿面磨削烧伤。正是这两个因素导致齿轮表面产生磨削裂纹。The 20 CrMnMo steel gear, subjected to carburizing, hardening, tempering and then high-frequency induction hardening and tempering again, exhibited longitudinal cracks on its tooth surface after grinding. The chemical composition analysis, metallographic examination and hardness measurements were performed for the cracked gear to discover the cause of its cracking. The results showed that the gear did not be sufficiently tempered after high-frequency induction hardening and therefore had larger residual stress, and the tooth surface displayed grinding burn due to fault in grinding practice. It was these two factors that resulted in formation of grinding cracks on the surface of the gear.

关 键 词：20CRMNMO钢 纵向裂纹 回火 磨削烧伤 

分 类 号：TG115[金属学及工艺—物理冶金]