中央自动充放气铜管开裂失效分析

通过对中央充放气铜管宏观检查、化学成分分析、硬度测试、氨熏试验等结果分析,确定了其开裂原因是由于工件冷变形后未消除残余应力,加之装配后产生的应力,在露天放置又受到大气雨水等共同作用,形成了腐蚀环境,导致产生应力腐蚀裂纹。并提出了去应力退火预防中央充放气铜管开裂,效果良好。

Central automatic inflation and deflation brass cracking failure analysis

Central charge bleed brass macroscopic examination,chemical composition analysis,hardness testing,Ammonia test results,to determine the cause of the cracking is due to cold deformation of the workpiece does not eliminate the residual stress,coupled with the stress resulting assembly in the open airplace but also by the joint action of the atmospheric rain,etc.,to form a corrosive environment,resulting in stress corrosion cracking.And to stress annealing to prevent central charge and deflated brass cracking good effect.