增压器涡壳裂纹分析  

Crack Analysis of Supercharger Turbine Casing

作　　者：许晓峰 廖宏 邵庆丰 XU Xiaofeng;LIAO Hong;SHAO Qingfeng(Chongqing Jiangjin Shipbuilding Industry Co.,Ltd.,Chongqing 402263,China)

机构地区：[1]重庆江增船舶重工有限公司,重庆402263

出　　处：《热加工工艺》2021年第7期161-162,共2页Hot Working Technology

摘　　要：ZL104增压器涡壳加工后在车间放置过程中出现自然开裂现象,采用化学分析、金相分析等测试方法对壳体开裂原因进行分析。结果表明:壳体中Fe元素含量超标严重,铸件金相组织中存在大量粗大针状和片状的脆性Fe相,同时铸件晶粒粗大,铸件壳体在残余加工应力作用下,沿片状的脆性Fe相发生应力延迟开裂。Natural cracking occurred in ZL104 supercharger turbine casing during workshop placement after machining.The chemical analysis and metallographic analysis were carried out to find the cracking cause. The results show that the iron element in turbine casing exceeds the standard seriously. There is a large amount of thick needlelike and flaky brittle iron phase in the microstructure. Meanwhile, because of the large grain size, stress delay cracking generates along the flaky brittle iron phases under the influence of residual machining stress.

关 键 词：涡壳 Fe相 裂纹 应力延迟开裂 

分 类 号：TG111.91[金属学及工艺—物理冶金]