双头螺柱断裂失效分析  

Fracture analysis of stud bolt

作　　者：孙国峰 王大为[2] 

机构地区：[1]浙江国检检测技术有限公司,浙江海盐314300 [2]成都飞机工业(集团)有限责任公司制造工程部,四川成都610092

出　　处：《金属热处理》2016年第4期213-215,共3页Heat Treatment of Metals

摘　　要：M30×410 mm的双头螺柱在使用中发生了断裂。通过宏观检查、断口扫描、金相检查、化学成分测定、力学性能检测、硬度梯度检测等方式对断裂原因进行分析。结果表明,螺柱的显微组织、化学成分、力学性能正常;螺柱断口具有典型的疲劳断裂特征,其断裂形式为疲劳断裂;螺柱断裂的主要原因是螺柱杆部表面产生的微裂纹在交变应力的持续作用下逐步扩展,最终造成断裂。M30 × 410 mm of the stud bolt was fracture during running. The fracture reason of the stud was analyzed by macro observation,fracture scanning,metallographic examination,chemical composition analysis,mechanical properties test,hardness gradient test and so on.The results show that the microstructure,chemical composition and mechanical properties of the stud bolt are all normal; the fracture of the bolt is characterized by fatigue fracture; the main reason of the bolt fracture is that the micro crack is generated on the bolt surface,thus producing fatigue crack which extends further under the continuous alternate stress and finally resultes in fatigue fracture.

关 键 词：螺柱 疲劳裂纹 断裂 

分 类 号：TG115.21[金属学及工艺—物理冶金]