中压内缸螺栓断裂原因分析

Fracture Analysis of Intermediate Pressure Inner Cylinder Bolt

采用宏观形貌观察、化学成分分析、金相组织观察与力学性能试验等方法,对某发电厂中压内缸螺栓断裂原因进行了分析。结果表明,该螺栓在装卸过程中温控不当,导致螺栓内壁过热、灼伤,微观组织恶化,硬度偏高,最终断裂失效,并提出相应的建议。

Analysis of the intermediate pressure inner cylinder bolt was conducted by visual inspection,chemical composition analysis, metallographic examination and mechanical tests. The results showed that superheated internal surface resulted from unsuitable temperature control in construction deteriorated the microstructure and hardness of the bolt, gave rise to the failure. Suggestions were put forward in the end.