304不锈钢叶轮后盖板疲劳断裂原因分析  

Study on the Fatigue Fracture of 304 Stainless Steel Impeller Rear Cover

作　　者：黄景峰 鲍炎 张久峰 呼立红 李晓鹏 HUANG Jingfeng;BAO Yan;ZHANG Jiufeng;HU Lihong;LI Xiaopeng(Shenyang Zkwell Corrosion Control Technology Co.,Ltd.,Shenyang 110180,China;CNPC Fushun Petrochemical Company,Fushun 113004,China)

机构地区：[1]沈阳中科韦尔腐蚀控制技术有限公司,辽宁沈阳110180 [2]中国石油抚顺石化分公司,辽宁抚顺113004

出　　处：《石油化工腐蚀与防护》2021年第3期56-61,共6页Corrosion & Protection In Petrochemical Industry

摘　　要：叶轮是热水泵关键过流部件,是热水泵能量转换的核心部件,也是运行过程中最容易破坏的部件。某厂橡胶装置后处理热水泵叶轮的后盖板发生了断裂,为寻找断裂原因,进行了宏观检查、材质分析、金相检验、扫描电镜观察和能谱分析,结果表明:铸造缺陷是叶轮后盖板断裂的主要原因。铸造缺陷处发生应力集中从而形成裂纹源,在交变载荷的作用下,裂纹不断扩展,最终导致疲劳断裂。Impeller is the key flow passage component inside hot water pump,which is the core component for pump energy conversion and the most easily damaged part in operation.Analysis scheme was adopted in response to fractures occurred in impeller rear cover of a rubber unit,such as macroscopic examination,material analysis,metallographic examination,scanning electron microscope and energy spectrum analysis.The results revealed that casting defect is the main cause.Stress concentration initiated from casting defects,resulting in the formation of crack sources.Under the action of alternate load,the cracks continue to expand and eventually lead to fracture.

关 键 词：热水泵叶轮 铸造缺陷 疲劳断裂 

分 类 号：TQ330.4[化学工程—橡胶工业] TG115[金属学及工艺—物理冶金]