给水泵汽轮机动叶片断裂失效分析  

Fracture Failure Analysis of Feed Water Pump Turbine Blade

作　　者：张强 王占文 方旭 丁俊 李云飞 ZHANG Qiang;WANG Zhanwen;FANG Xu;DING Jun;LI Yunfei(China Resources Power(Cangzhou Yundong)Co.,LTD.,Cangzhou061000,China)

机构地区：[1]华润电力(沧州运东)有限公司,河北沧州061000

出　　处：《河北电力技术》2022年第1期88-91,共4页Hebei Electric Power

摘　　要：针对某发电机组给水泵汽轮机动叶片断裂问题,通过宏观形貌与扫描电镜分析、化学成分分析、金相检查、力学性能试验等进行失效原因分析,发现出汽侧叶根与叶身形线间过渡处的加工质量欠佳,存在机加工痕迹较粗糙及圆弧半径偏小,断面存在明显的疲劳裂纹,认为叶片断裂属于高周疲劳断裂。提出更换现有批次叶片、优化出汽侧叶根与叶身形线间过渡处的设计和采用圆滑过渡等处理措施,并建议对重要辅机得主要部件重点监控、监造和选择优质供应商。Feed water pump turbine blades for unit 1 fracture problem,through macro morphology and scanning electron microscope analysis,chemical composition analysis,metallographic examination,mechanical property test,such as analysis,found out the steam side of blade root and leaf shape line transition between poor processing quality,there are small machining trace is rougher and arc radius,section exist obvious fatigue crack,Blade fracture belongs to high cycle fatigue fracture.Replace the existing batches of blades,optimize the design of the transition between the steam outlet side blade root and blade shape line,adopt a smooth transition,and pay attention to the main components of important auxiliary machines should focus on monitoring,manufacturing and selection of high-quality suppliers.

关 键 词：给水泵汽轮机 动叶片 断裂 过渡面 疲劳裂纹 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]