冲洗阀出现进水端连接螺母纵向断裂。采用宏、微观、扫描电镜、化学分析、应力测定及计算等方法对断裂螺母进行了分析。结果表明，螺母存在多种铸造及加工的宏观、微观观察缺陷和残余应力过高是螺母断裂失效的原因。
The longitudinal fracture arosed in connecting nut for inlet flushing valve. The fracture analysis was made by means of microstructure, macrostructure, SEM, chemical composition, stress measurement and calculation. Experiment results showed that the fracture of the nut was originated from a variety of macro defects, micro defects both by founding and machining, as well as high residual stress.
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