铁路棘轮补偿用不锈钢销轴开裂失效分析  

Analysis on Crack Failure of Stainless Steel Pin Shaft for Railway Ratchet Compensation

作　　者：徐钦华 彭志贤 李明扬 袁泽喜[2] 宗永 李超群 刘静[2] XU Qin-hua;PENG Zhi-xian;LI Ming-yang;YUAN Ze-xi;ZONG Yong;LI Chao-qun;LIU Jing(Stainless Steel Products of Fasten Group Co.,Ltd.,Jiangyin 214429,China;The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]江阴法尔胜泓昇不锈钢制品有限公司,江苏江阴214429 [2]武汉科技大学耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《材料保护》2020年第11期154-159,共6页Materials Protection

基　　金：江苏省科技成果转化专项重大产业创新专题(BA2018047);国家自然科学基金资助项目(51871171)。

摘　　要：为了解铁路电气工程用棘轮补偿下锚销轴服役工件开裂失效的原因,采用金相显微观察、化学成分分析、扫描电镜和能谱分析及有限元模拟等手段,对开裂销轴金相组织、夹杂物以及内部裂纹进行了观察与表征。结合分析测试结果及其服役环境判断,其主要失效形式为腐蚀疲劳开裂,失效工件内部存在的冶金夹渣和非金属夹杂物是疲劳裂纹的萌生源。In order to solve the problem of actual cracking effect of ratchet wheel to compensate service workpiece of anchor pin shaft in railway electrical engineering,the metallographic microstructure,inclusions and internal cracks of cracked pin shaft were observed and characterized by means of metallographic microscopic observation,chemical composition analysis,scanning electron microscope,energy spectrum analysis and finite element simulation.Results showed that the main failure mode was corrosion fatigue cracking according to the service environment,and metallurgical slag inclusions in the failure workpiece and non-metallic inclusions in the steel could result into the cracking of the material.

关 键 词：失效分析 304不锈钢 销轴 夹杂物 腐蚀疲劳开裂 

分 类 号：TG172[金属学及工艺—金属表面处理]