万向轴十字销断裂原因  

Fracture reason of cross pin of universal shaft

作　　者：汪瑞俊 WANG Ruijun(Chizhou Institute of Quality Inspection and Research,Chizhou 247000,China)

机构地区：[1]池州市质量监督检验研究院,池州247000

出　　处：《理化检验（物理分册）》2023年第8期40-42,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某万向轴十字销在机车运行过程中发生断裂,采用宏观观察、化学成分分析、硬度测试、金相检验、扫描电镜分析等方法对其断裂原因进行了分析。结果表明:不良的淬火马氏体组织及大尺寸的MnS夹杂降低了十字销倒角部位的抗疲劳性能,在交变应力的作用下,十字销发生疲劳断裂。A universal shaft cross pin fractured during the operation of the locomotive.The fracture cause was analyzed by means of macroscopic observation,chemical composition analysis,hardness test,metallographic examination and scanning electron microscope analysis.The results show that the poor quenched martensite structure and large size MnS inclusions reduced the fatigue resistance of the chamfered part of the cross pin.Under the action of alternating stress,the fatigue fracture of the cross pin occurred.

关 键 词：十字销 疲劳断裂 MnS夹杂 淬火马氏体 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]