烟气轮机叶片断裂原因分析
Failure Analysis of Flue Gas Turbine Blade
摘 要
采用化学成分分析、硬度测试、断口形貌观察以及金相检验对某炼油厂烟气轮机叶片断裂原因进行了分析.结果表明:叶片断裂性质为早期疲劳断裂,失效原因是锻造工艺不当;断裂起源于叶片排气边晶界处;叶片材料晶粒粗大并有大量的混晶存在以及沿晶界析出的链状连续碳化物,降低了叶片材料的强度和韧性,促进了裂纹萌生与扩展,导致叶片在交变应力的作用下疲劳断裂.
叶片
疲劳
沿晶断裂
flue gas turbine
blade
fatigue
intergranular fracture
Abstract
The fracture of flue gas turbine blade of a refinery was analyzed by means of chemical composition analysis,hardness test,fracture surface observation and metallographic examination.The results show that the fracture feature of the blade was early fatigue fracture,and the failure was caused by improper forging process.Fatigue cracks originated from the grain boundaries at the exhaust edge of the blade.Coarse grains and a large number of grain stripes as well as chain carbides along the grain boundaries decreased the blade material strength and toughness,and accelerated the crack initiation and propagation that resulted in the fracture of the turbine blade under alternating stress.
中图分类号 TG142.41
所属栏目 失效分析
基金项目 山东省科学院博士基金资助项目(2007-09)
收稿日期 2009/9/5
修改稿日期 2010/5/16
网络出版日期
作者单位点击查看
备注徐娜(1979-),女,山东潍坊人,助理研究员,硕士.
引用该论文: XU Na1,SHI Jun-bo,WU Xiao-feng,LI Fu-wei,LI En-xia,ZANG Qi-shan. Failure Analysis of Flue Gas Turbine Blade[J]. Materials for mechancial engineering, 2010, 34(10): 79～81
徐娜,时军波,吴晓峰,李福伟,李恩霞,臧启山. 烟气轮机叶片断裂原因分析[J]. 机械工程材料, 2010, 34(10): 79～81
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参考文献
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【2】CARTER T J.Common failures in gas turbine blades[J].Engineering Failure Analysis,2005,12(2):237-247.
【3】王仁智,吴培远.疲劳失效分析[M].北京:机械工业出版社,1987.
【4】DONACHIE M J,PINKOWISH A A.Effect of hot work on the properties of waspaloy[J].Metal Transaction,1970,1(9):2623-2630.
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