锁紧螺母断裂失效实证分析  

Fracture Demonstration Analysis for the Lock Nut

作　　者：李文魁 韩洪元[2] 

机构地区：[1]新乡平原航空器材有限公司,河南新乡453000 [2]新乡职业技术学院,河南新乡453000

出　　处：《装备制造技术》2016年第3期182-184,共3页Equipment Manufacturing Technology

摘　　要：锁紧螺母在装配时出现断裂,安装扭矩为80~90N·m.对断裂件进行宏观和微观检验、断口分析、硬度检测、化学成分检测、氢含量检测、金相检验等方面的分析,结果表明：送样产品由于氢原子的存在而产生原始裂纹,在装配过程中,原始裂纹会随着预紧力的加大而扩展,进而突然断裂。可采用碱性去油和去锈、超声波去油和喷砂去锈而避免氢脆。Nut part no. 145142XDH2514 was cracked in assembling,and the assemble torque is 80~90N＊m. After tested crack part by Macroscopic and microscopic inspection,crack analysis,hardness test,chemical composition analysis,content of hydrogen,metallographic test and etc.,the result shows： samples are with original crack which is occuered due to the existence of hydrogen atom. In the assembling process,original crack will expand with the increase of the pretightening force,and then suddenly break. You can use alkaline cleaning oil and derusting,or taking ultrasonic cleaning oil and sandblasting derusting to avoid hydrogen embrittlement.

关 键 词：锁紧螺母 氢脆 失效分析 

分 类 号：TB302[一般工业技术—材料科学与工程]