汽动给水泵汽轮机叶片断裂机理分析  

Fracture Mechanism Analysis of Turbine Blades of Feedwater Pump Driven by Steam

作　　者：张兵[1] 郑准备[1] 王小迎[1] 温睿麟[1] 

机构地区：[1]陕西电力科学研究院,陕西西安710054

出　　处：《热加工工艺》2007年第24期73-75,78,共4页Hot Working Technology

摘　　要：通过化学成分分析、宏观分析、显微组织分析、扫描电镜分析、能谱分析等方法,对某发电机组汽动给水泵汽轮机断裂叶片进行了试验研究。结果表明,小汽轮机叶片为高周疲劳断裂失效,叶片塑性指标低和表面加工精度差是导致开裂的重要原因,蒸汽腐蚀也加速了叶片的失效。The fracture mechanism of turbine blades of feedwater pump driven by steam have been studied by chemical elementsanalysis, macroscopical analysis, metallographic analysis, SEM analysis and EDS analysis. The results show that the fracture invalidation of turbine blade is high-frequency fatigue. Blade＇s low plastic value and bad machining precision are major reason for fracture invalidation, steam erosion also speeds up the invalidation of turbine blades.

关 键 词：汽动给水泵 叶片 断裂机理 失效 

分 类 号：TG167.2[金属学及工艺—热处理] TG157[金属学及工艺—金属学]