不锈钢泵叶轮叶片断裂原因  

Reasons for the fracture of stainless steel pump impeller blades

作　　者：毛宇龙 李成龙 王旭 谷卫彪 范世凯 黄峰 MAO Yulong;LI Chenglong;WANG Xu;GU Weibiao;FAN Shikai;HUANG Feng(Anhui Qingxi Detection Technology Co.,Ltd.,Hefei 230601,China)

机构地区：[1]安徽省清析检测技术有限公司,合肥230601

出　　处：《理化检验（物理分册）》2024年第11期64-66,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某316L不锈钢泵叶轮叶片发生断裂现象。采用宏观观察、化学成分分析、扫描电镜分析、金相检验和显微硬度测试等方法分析了叶片断裂的原因。结果表明:叶轮叶片表面存在明显的凹坑和划痕,凹坑和划痕处产生应力集中,在工作载荷和叶片振动产生的激振力作用下,应力集中处萌生裂纹并不断扩展,最终导致叶片发生疲劳断裂。A 316L stainless steel pump impeller blade broke.The reasons for blade fracture were analyzed using macroscopic observation,chemical composition analysis,scanning electron microscopy analysis,metallographic examination and microhardness testing.The results show that there were obvious pits and scratches on the surface of the impeller blades,and stress concentration occurred at the pits and scratches.Under the action of the working load and the excitation force generated by blade vibration,cracks appeared at the stress concentration and continued to propagate,ultimately led to fatigue fracture of the blades.

关 键 词：316L不锈钢 叶轮叶片 凹坑 划痕 疲劳断裂 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]