20CrMnMo齿轮坯超声波探伤裂纹缺陷分析  

Analysis of crack defects of 20CrMnMo gear blank by ultrasonic flaw detection

作　　者：时飞扬 陈昌华 豆毅恒 陈继平 钱健清 SHI Feiyang;CHEN Changhua;DOU Yiheng;CHEN Jiping;QIAN Jianqing(School of Metallurgy Engineering,Anhui University of Technology,Ma′anshan 243002,China;Technology Center,Nanjing Develop Advanced Manufacturing Co.,Ltd.,Nanjing 210048,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002 [2]南京迪威尔高端制造股份有限公司技术中心,江苏南京210048

出　　处：《物理测试》2023年第2期53-58,共6页Physics Examination and Testing

摘　　要：锻造厂锻造的20CrMnMo齿轮毛坯经超声波探伤检验发现部分齿轮坯内部存在裂纹。对含有缺陷的齿轮坯进行解剖取样,通过低倍检验、金相检验、断口分析以及扫描电镜检验等方法对齿轮坯内部裂纹的产生原因进行分析。结果表明:齿轮坯内部未完全焊合的气泡和聚集成簇分布的夹杂在组织应力和热应力的作用下导致裂纹的产生。During the ultrasonic flaw detection of gear blanks of 20CrMnMo forged by one forging plant,it was found that there were some cracks inside.The gear blanks with defects were dissected and sampled.The causes of internal cracks in⁃side of gear blanks were analyzed by macroscopic examination,metallographic examination,fracture analysis,scanning electron microscope examination.The results showed that the incomplete welded bubbles and clustered inclusions in the gear blank led to formation of cracks under the action of structural stress and thermal stress.

关 键 词：齿轮坯 低倍检验 金相检验 断口分析 裂纹缺陷 

分 类 号：TG115.285[金属学及工艺—物理冶金]