摘要
某型号飞机电缆装配前进行例行检查时,发现ZG0Cr14Ni5Mo2Cu上位锁支臂开裂。通过现场调查、对断裂件的材料成分分析、金相组织观察、断口的宏微观观察、硬度检测以及设计结构、受力及现行工艺等综合分析,以确定该上位锁支臂断裂的性质及产生原因。结果表明:上位锁支臂的断裂为过大的装配应力、校形残余应力与氢共同作用下的氢致脆断造成的。此案例分析中发现了隔板设计结构、校形的残余应力问题,为此提出了合理的改进建议。
ZGOCrl4Ni5Mo2Cu upper lock arms were found to have crack during routine inspection. The cracking cause and character were analyzed by chemical composition analysis, macro and micro observation of fracture surface, hard testing, combined with comprehensive analysis on design structure, residual stress, and the current process. The results indicate that the failure mode is hydrogen induced cracking. The co-effect of greater assembly stress and correction residual stress and hydrogen resulted in the crack of the arms. Some suggesfions were put forward to improve clapboard design structure and adjust residual
出处
《失效分析与预防》
2013年第1期47-50,共4页
Failure Analysis and Prevention
关键词
上位锁支臂
装配应力
残余应力
氢致开裂
upper lock arms
assembly stress
residual stress
hydrogen embrittlement
