SUH616钢汽轮机叶片围带断裂失效分析  

Analysis of SUH616 Steel Turbine Blade Shroud Ring Crack Failures

作　　者：王立峰[1] 丁辉[1] 胡双喜[1] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072

出　　处：《华中电力》2005年第1期4-6,共3页Central China Electric Power

摘　　要：对发生脆性断裂事故的汽轮机叶片围带用钢SUH616的微观组织、硬度、析出相、钢中δ铁素体的含量等进行了检测和分析,SUH616钢中硬度较高的块状组织大量偏聚、沿晶碳化物的存在以及基体组织中δ铁素体含量的超标是脆性裂纹产生的根本原因。An analysis is performed on the microstructure, hardness , precipitate phase and the proportion of δferrite etc of the turbine blade shroud ring of SUH616 steel which was broken in a fragile way.Results reveal that heavy agglomeration of harder structre,presence of carbides at grain boundaries and excess of delta ferrite are all responsible to the fragile cracks.

关 键 词：SUH616 脆性裂纹 Delta铁素体 

分 类 号：TG142.45[一般工业技术—材料科学与工程]