服役态汽轮机末级叶片显微组织和力学性能变化规律的研究  

Change Regularity of Microstructure and Mechanical Properties of the As-served Steam Turbine Last Stage Blade

作　　者：张健 邵敏 方振邦 王若民 赵常威 杨洋 陈晓璐 汤文明[2] ZHANG Jian;SHAO Min;FANG Zhen-bang;WANG Ruo-min;ZHAO Chang-wei;YANG Yang;CHEN Xiao-lu;TANG Wen-ming(Anhui Xinli Electric Technology Co.,Ltd.,Hefei 230601,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽新力电业科技有限责任公司,合肥230601 [2]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《汽轮机技术》2025年第2期156-160,104,共6页Turbine Technology

基　　金：安徽新力电业科技有限责任公司科技项目(2023咨-KJ-08)。

摘　　要：针对某火电机组服役10年的660MW汽轮机末级叶片,采用显微分析、物相分析与力学性能测试的方法,结合应力分布数值模拟,探究长期服役过程中该17-4PH钢末级叶片显微组织和力学性能的变化规律。结果表明,服役叶片不同部位马氏体板条宽度无明显变化,但逆转变奥氏体含量不同,ε-富铜相、M_(23) C_(6)相和Nb(C,N)相等第二相颗粒细小而弥散分布,未发生明显长大。服役态汽轮机末级叶片从底部至顶部逆转变奥氏体的相对含量逐渐增多,导致其强度、硬度逐渐降低,塑性逐渐提高。Aiming at the 660MW steam turbine last stage blade in service for 10 years in a thermal power generation unit,the methods of microstructure and phase composition analyses and mechanical property tests,combining with the numerical simulation of stress distribution,were employed to clarify the change regularity of microstructure and mechanical properties of the steam turbine last stage blade served for a long term.The results show that the different parts of the 17-4PH steel blade are unvaried in width of the martensite laths,however are changed in content of the inverse transition austenite.The secondary-phase particles such asε-Cu rich,M_(23) C_(6) and Nb(C,N)in the as-served last stage blade are still fine,and dispersively distributed without apparent ripening.Increase of content of the inverse transition austenite results in gradual decrease of strength and hardness,but increase of plasticity of the as-served steam turbine last stage blade from bottom to top.

关 键 词：汽轮机末级叶片 逆转变奥氏体 显微组织 力学性能 

分 类 号：TG161[金属学及工艺—热处理]