热输入对双相钢药芯焊丝电弧焊接头组织和性能的影响  

Effect of Heat Input on Microstructure and Properties of Flux-cored Wire Arc Welding Joint of Duplex Stainless Steel

作　　者：张莹莹 刘政军[1] 金美玲[1] 李东明[2] ZHANG Yingying;LIU Zhengjun;JIN Meiling;LI Dongming(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;School of Mechanical Engineering,Liaoning Shihua University,Fushun 113001,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]辽宁石油化工大学机械工程学院,抚顺113001

出　　处：《机械工程材料》2020年第4期30-34,共5页Materials For Mechanical Engineering

摘　　要：对2205双相不锈钢板进行了药芯焊丝电弧焊,研究了不同热输入(8.32,11.02,14.04,17.39kJ·cm^-1)对焊接接头显微组织、铁素体含量、冲击性能、显微硬度和耐点腐蚀性能的影响。结果表明:2205双相不锈钢接头焊缝、熔合区及热影响区均由奥氏体和铁素体组成,铁素体含量随着热输入的增加而逐渐降低;焊接热输入在14.04kJ·cm^-1时,接头区域铁素体体积分数基本满足40%~60%的要求;随着焊接热输入的增加,接头焊缝和热影响区的硬度略有降低,焊缝金属的冲击吸收功先升高后下降,热影响区的点腐蚀速率变化不大,焊缝的点腐蚀速率则先下降后升高;焊接热输入在14.04kJ·cm^-1时,2205双相不锈钢焊接接头的耐点腐蚀性能最好。Flux-cored arc welding of 2205duplex stainless steel plate was performed.The effects of different heat inputs(8.32,11.02,14.04,17.39kJ·cm^-1)on the microstructure,ferrite content,impact properties,microhardness and pitting resistance of the welded joint were studied.The results show that the welding seam,fusion zone and heat affected zone of 2205duplex stainless steel joint were composed of austenite and ferrite,and the ferrite content gradually decreased with the heat input increasing.When the welding heat input was 14.04kJ·cm^-1,the ferrite volume fraction of the joint basically met the requirement of 40%-60%.With the increase of welding heat input,the hardness of the joint weld and the heat affected zone decreased slightly,the impact absorption energy of the weld metal increased first and then decreased,and the pitting corrosion rate of the heat affected zone changed little,while that of the weld decreased first and then increased.When the heat input was 14.04kJ·cm^-1,the resistance to pitting corrosion of 2205duplex stainless steel was the best.

关 键 词：热输入 双相不锈钢 药芯焊丝 接头 铁素体 点腐蚀 

分 类 号：TG444[金属学及工艺—焊接]