激光熔覆修复的GH864合金烟气轮机动叶片失效原因分析  

Failure analysis on laser cladding repaired GH864 alloy rotating blades of flue gas turbines

作　　者：胡燕慧[1] 田永江[1] 陈赤囡[1] 阮中健[1] 张峥[1] 钟群鹏[1] 韩帮成[2] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083 [2]北京航空航天大学仪器科学与光电工程学院,北京100083

出　　处：《金属热处理》2008年第5期96-99,共4页Heat Treatment of Metals

基　　金：民用航天科研预先研究项目(C5120062105)

摘　　要：通过断口的宏观和微观分析及金相检验,对两起激光熔覆修复的GH864合金烟气轮机动叶片的断裂原因进行了分析。结果表明,两起事故都是由叶片激光熔覆层中缺陷引起的疲劳断裂,同时还分析了过渡区附近的沿晶裂纹产生原因,并提出了一些建议。The reasons for two failure cases of flue gas turbine rotating blades repaired GH864 by laser cladding were in- vestigated by analyzing fracture macro-morphology, micro-morphology and microstructure. The results show that failures of the two pieces of blades both are caused by flaws in laser cladding layers and belong to fatigue fracture. The intergranular cracks found in transition zone were also analyzed and some advices were put forward.

关 键 词：疲劳断裂 激光熔覆 沿晶裂纹 

分 类 号：TG157[金属学及工艺—热处理]