固溶处理对S31803钢TIG焊缝组织与腐蚀性能的影响  

Effect of solid solution treatment on microstructure and corrosion properties of TIG weld of S31803 steel

作　　者：丛发敏 夏春智[1] 刘鹏[2] Cong Famin;Xia Chunzhi;Liu Peng(Jiangsu University of Science and Technology,Zhenjiang 212003,Jiangsu,China;Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]江苏科技大学,江苏镇江212003 [2]山东建筑大学,济南250101

出　　处：《焊接》2020年第2期20-23,I0016,共5页Welding & Joining

基　　金：国家自然科学基金资助项目(51405205)。

摘　　要：采用光学显微镜、维氏硬度计和电化学分析仪等对不同固溶温度下S31803双相不锈钢TIG多层焊缝的显微组织、硬度及电化学腐蚀性能进行了研究。试验结果表明,S31803双相不锈钢TIG多层焊缝主要由奥氏体和铁素体组成,且多层焊缝区域中也出现少量σ相,而焊缝下层焊道中奥氏体含量明显少于上层焊道;经过固溶处理,奥氏体和铁素体含量接近,在经过1050℃固溶处理后σ相消失;但随着固溶温度的提高,奥氏体所占比例增大。固溶处理促使焊缝上下层的硬度趋于接近,当950℃固溶热处理后,焊缝硬度略有增加,而经过1050℃固溶处理,焊缝硬度降低。此外,随固溶温度升高,焊缝耐腐蚀性越好,其中固溶温度为1050℃时,耐腐蚀性能最佳。The microstructure,hardness and electrochemical corrosion properties of TIG multilayer weld for S31803 duplex stainless steel under different solution temperatures were studied by optical microscope,Vickers hardness tester and electrochemical analysis.The test results showed that the TIG multi-layer weld of S31803 duplex stainless steel was mainly composed of austenite and ferrite,and a small amount ofσphase also appeared in the multi-layer weld,while the austenite content in the lower bead was obviously lower than that in the upper bead.After solid solution treatment,the content of austenite and ferrite were close,andσphase disappeared after solution treatment at 1050℃.However,with the increase of solid solution temperature,the proportion of austenite also increased.The hardness of the upper and lower layers of the weld tended to be close to each other due to solution treatment.After solution treatment at 950℃,the hardness of the weld slightly increased,while after solution treatment at 1050℃,the hardness of the weld decreased.In addition,with the increase of solid solution temperature,the corrosion resistance of weld was better,and when the solid solution temperature was 1050℃,the corrosion resistance was the best.

关 键 词：S31803双相不锈钢 热处理 显微组织 耐腐蚀性能 

分 类 号：TG441.8[金属学及工艺—焊接]