压力容器高温损伤后的疲劳行为研究

Research on Fatigue Behavior of High Temperature Pressure Vessel

对高温损伤失效压力容器进行微观组织和力学性能研究,分析其高温失效原因。结果表明,高温损伤失效压力容器的边部与心部组织均为板条马氏体+碳化物,但是边部与心部碳化物的形状与数量存在差异。高温损伤失效的主要原因为疲劳裂纹,其形成归因于较大尺寸的第二相、高温氧化、点腐蚀坑和夹杂物。

The microstructure and mechanical properties of high temperature pressure vessel were studied, and the failure reasons were analyzed. The results show that the microstructure of high temperature failure pressure vessel is lath martensite and carbide, and the shape and number of carbide which distribute on the edge and in the center are different. The main reason for failure is fatigue crack, which occurred due to the second phase, high temperature oxidation, corrosion and inclusion.