Influence of Multiple Repair Welding on Microstructure and Properties of 06Cr19Ni10 Stainless Steel  

作　　者：Qimeng Liu Jingyu Chang Yuanzhi Wang Dong Xia Jianfei Zhang Xinlong Guan Yuwei Zhou Bing Yang 

机构地区：[1]Jiangsu Kingway Transportation Co.,Ltd.,Suzhou 215000,China [2]State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 610031,China

出　　处：《Chinese Journal of Mechanical Engineering》2024年第5期481-498,共18页中国机械工程学报（英文版）

基　　金：Supported by National Natural Science Foundation of China(Grant No.52375159);Research Project supported by Jiangsu Kingway Transportation Co.,Ltd.(Grant No.KYL202212-0110).

摘　　要：Repair welding technology is widely used in the manufacturing and maintenance of rail transit equipment to repair welding defects.However,repair welding induces modifications in joint performance,and it is necessary to study the microstructure evolution behavior to reveal the reasons.In this study,the effects of multiple repair welding on the microstructure,mechanical,and fatigue properties of 06Cr19Ni10 stainless steel samples were studied.The surface texture and fracture morphology analyses of the samples were conducted by optical microscopy(OM),scanning electron microscopy(SEM),and its equipped backscattered electron diffraction(EBSD)technique.The mechanical and fatigue properties of the samples with different repair welding times were further obtained by hardness,tensile,and fatigue tests.The results show an increase in the grain size and the substructure content in the heat-affected zone(HAZ),and the austenite orientation is changed,attributable to multiple repair welding.Multiple heat inputs result in a significant increase in hardness from 165 HV to 185 HV,a noticeable decrease in tensile strength and elongation,and an upward trend in yield strength.Under the constant stress level,the heat input of multiple repair welding causes a decrease in the fatigue life and significantly reduces toughness in the instantaneous fracture zone of the secondary repair sample.

关 键 词：Multiple repair welding Heat input MICROSTRUCTURE 06Cr19Ni10 

分 类 号：TG457.11[金属学及工艺—焊接] TG142.71[一般工业技术—材料科学与工程]