重型燃气轮机透平叶片固溶处理后显微组织分析  

Microstructure analysis of heavy duty gas turbine blades after solution treatment

作　　者：孙健 姚伟民 殷春宏 曹琦 周进 冯可云 SUN Jian;YAO Weimin;YIN Chunhong;CAO Qi;ZHOU Jin;FENG Keyun(Jiangsu Huadian Wujiang Thermal Power Co.,Ltd.,Suzhou 215217,China;Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,China)

机构地区：[1]江苏华电吴江热电有限公司,江苏苏州215217 [2]华电电力科学研究院有限公司,杭州310030

出　　处：《黑龙江电力》2025年第1期91-94,共4页Heilongjiang Electric Power

基　　金：国家重点研发计划(项目编号:2023YFB3812700)。

摘　　要：为研究恢复热处理后燃气轮机透平叶片组织损伤恢复状况,采用金相、扫描电子显微分析、能谱分析等试验方法,对固溶处理后的重型燃气轮机服役透平叶片进行显微组织研究。研究发现,固溶处理后的服役透平叶片金相组织为典型的枝晶形态,符合GDT111等轴合金的组织要求;γ′相作为主要的强化相弥散分布在基体表面,一次γ′相较为粗大,二次γ′相较为细小,一次γ′相仍存在一定程度的粗化和筏化现象;同时晶界处还分布着块状的碳化物和γ-γ′共晶相,在叶身部位晶界处发现γ′相和铬元素的贫化区,2条微裂纹贯穿该贫化区,而固溶处理无法消除该贫化区及微裂纹。In order to investigate the recovery of microstructural damage in gas turbine blades after solution heat treatment,metallography,scanning electron microanalysis,energy dispersive spectrum and other test methods were used to study the microstructure of heavy-duty gas turbine service turbine blades after solution treatment.It is found that the metallographic structure of the service turbine blades after solid solution treatment is typical dendrite morphology,which meets the microstructure requirements of GDT111 equiaxial alloy.Theγ′phase,as the main strengthening phase,is dispersed on the surface of the matrix,the primaryγ′phase is coarse,the secondaryγ′phase is small,and the primaryγ′phase still has coarsening and rafting phenomenon to a certain extent.At the same time,massive carbides andγ-γ′eutectic phases are also distributed in the grain boundaries,andγ′phase and chromium depletion zone are found in the grain boundaries of the leaf parts,and two microcracks penetrate the depleted zone,but the solution treatment can not eliminate the depleted zone and microcracks.

关 键 词：透平叶片 固溶处理 γ′相 贫化区 微裂纹 

分 类 号：TG113[金属学及工艺—物理冶金]