Q460车桥壳埋弧焊焊缝组织及电化学腐蚀行为  

Microstructure and electrochemical corrosion behavior of Q460 axle shell submerged arc weld

作　　者：纪建奕 路海涛 肖浚艺 潘家敬 Ji Jianyi;Lu Haitao;Xiao Junyi;Pan Jiajing(Qingte Group Co.,Ltd.,Qingdao 266106,Shandong,China;Qingdao University of Science and Technology,Qingdao 266061,Shandong,China)

机构地区：[1]青特集团有限公司,山东青岛266106 [2]青岛科技大学,山东青岛266061

出　　处：《焊接》2023年第6期24-30,43,共8页Welding & Joining

基　　金：中国博士后科学基金资助项目(2021M691703);青岛科技大学科研启动基金项目(12030430010674)。

摘　　要：选取Q460低合金高强钢及其埋弧焊焊接接头,采用金相显微镜、扫描电子显微镜(SEM)、能谱仪(EDS)和显微硬度计等测试手法研究焊缝组织及性能;通过电化学极化曲线的测试研究焊缝腐蚀行为。试验结果表明,焊缝组织为针状铁素体和珠光体,经过淬火加高温回火后的焊缝晶粒最为细小;焊缝的硬度大于母材的硬度;焊缝的抗腐蚀性能低于母材,在质量分数为3.5%的NaCl腐蚀环境下,较于同为低合金高强钢的Q510和Q345,Q460焊缝耐腐蚀性也略差。Q460 high strength low alloy steel and its submerged arc welded joints were chosen to study microstructure and properties of weld by metallographic microscope,scanning electron microscope(SEM),energy dispersive spectrometry(EDS)and microhardness tester.Corrosion behavior of weld was studied by electrochemical polarization curve test.The experimental results showed that microstructure of weld was needle-like ferrite and pearlite,grains of weld were the finest after quenching and high temperature tempering.Hardness of weld was greater than that of parent material.Corrosion resistance of weld was lower than that of parent material.Corrosion resistance of Q460 weld was slightly worse than that of Q510 and Q345 high strength low alloy steel in the corrosion environment NaCl with a mass fraction of 3.5%.

关 键 词：低合金高强钢 埋弧焊 焊缝组织 电化学腐蚀 

分 类 号：TG445[金属学及工艺—焊接]