超高强度螺栓断裂失效分析  

FAILURE ANALYSIS OF THE FRACTURE OF BOLTS OF SUPER HIGH STRENGTH

作　　者：杨力[1] 孙浩[1] 奚建法[1] 陆慧[1] 宁超[1] 王春亮[1] 曾德鑫 

机构地区：[1]上海材料研究所 [2]九江船用机械厂

出　　处：《理化检验（物理分册）》2004年第4期195-198,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：材质为35CrMnSiA钢的M56超高强螺栓在装配过程中,其螺帽与螺杆的R过渡处发生断裂。经检查,未装配的同批螺栓在螺帽与螺杆的R过渡处也存在微裂纹。借助化学分析、金相检验、扫描电镜和力学性能测试等手段对超高强度螺栓的显微组织、力学性能、宏观和微观断口形貌等进行了研究。结果表明,螺栓在表面处理过程中,表面富氢而产生氢致裂纹,在应力作用下,发生氢脆断裂。M56 Super high strength bolt made of 35CrMnSiA fractured at the position of the R transition area between the screw cap and the bolt, there are micro cracks at same position of the bolts of same lot which are not assembledyet. By means of metallographical examination, SEM inspection, the microstructure characteristics, chemical composition analysis and mechanical property testing, the macro-and microfractographs of the brittle broken bolt have been studied. The results show that the failure of the bolt had been damaged by hydrogen during surface treatment.

关 键 词：高强度螺栓 失效分析 氢脆 化学分析 金相检验 断口微观形貌 

分 类 号：TG142.41[一般工业技术—材料科学与工程]