135MW机组低压末级叶片裂纹原因分析  

Analysis of Cracks on 135MW Unit Low-pressure Last-stage Blade

作　　者：周正强 郑宏晔 胡洁梓 周宇通 张小菊 ZHOU Zheng-qiang;ZHENG Hong-ye;HU Jie-zi;ZHOU Yu-tong;ZHANG Xiao-ju(Electric Power Research Institute of State Grid Zhejiang Electric Power Company Limited,Hangzhou 310014,China;Hangzhou E-energy Power Technology Company Limited,Hangzhou 310014,China)

机构地区：[1]国网浙江省电力有限公司电力科学研究院,杭州310014 [2]杭州意能电力技术有限公司,杭州310014

出　　处：《汽轮机技术》2019年第6期479-480,446,共3页Turbine Technology

摘　　要：某火力发电厂135MW机组2Crl2MoV钢低压末级叶片进汽边出现大量密集裂纹,通过成分、力学性能、金相检验以及断口形貌的分析,认为高频淬火硬化工艺致使低压末级叶片进汽边表面硬化区域完全淬透,淬火相变组织应力较高,塑性功低,是叶片产生裂纹的主要原因。The fracture reason of the blade is analyzed by chemical composition analysis,mechanical properties test,metallurgical structure observation and fracture analysis.The result shows that the main reason is the reinforced zone at steam-inlet side of the low pressure last stage blades due to complete quenching,a hardened zone being formed,having higher stress in the phase-changed structure and having lower plastic work.

关 键 词：叶片 裂纹 高频淬火 塑性功 

分 类 号：TK267[动力工程及工程热物理—动力机械及工程]