热输入对超级双相不锈钢焊接接头组织和性能的影响  

Influence of heat input on the microstructure and properties of welded joints of super duplex stainless steel

作　　者：刘剑 牛虎理 孙丽 何亚章 王红 孙欣妍 LIU Jian;NIU Huli;SUN Li;HE Yazhang;WANG Hong;SUN Xinyan(China Petroleum Engineering Technology Research Co.,Ltd.,Tianjin 300451,China;Key Laboratory of Offshore Engineering of China Petroleum Corporation,Tianjin 300451,China;Drilling Branch of China Petroleum Offshore Engineering Co.,Ltd.,Tianjin 300480,China)

机构地区：[1]中国石油集团工程技术研究有限公司,天津300451 [2]中国石油集团海洋工程重点实验室,天津300451 [3]中国石油集团海洋工程有限公司钻井分公司,天津300480

出　　处：《石油工程建设》2023年第4期89-92,共4页Petroleum Engineering Construction

摘　　要：采用钨极氩弧焊根焊、热焊、手工电弧焊填充盖面的方式,以不同的热输入进行双相不锈钢S31803管材焊接试验,对焊接接头的冲击韧性、微观组织、相比例和耐点蚀能力研究分析。结果表明,母材、热影响区和焊缝区域奥氏体组织的形状存在差异;在一定范围内,随着热输入的增加,焊缝区域铁素体含量减少,韧性提高,耐点蚀性能提升;合适的热输入能够实现对铁素体和奥氏体相比例的控制,得到性能良好的焊接接头,对于双相不锈钢焊接具有较好的指导作用。The welding experiment of the S31803 pipe of duplex steel is carried out with different heat inputs by argon tungsten-arc root and hot and manual arc welding for filling the cover.The impact toughness,microstructure,phase ratio,and pitting resistance of the welded joint are analyzed.The results show that there are differences in the shape of austenitic structures in the base material,heat affected zone,and weld zone.In a certain range,with the increase in heat input,the ferrite content in the weld zone decreases;the toughness and the pitting resistance improve.The proper heat input can control the proportion of ferrite and austenitic phase and obtain the welded joint with great performance.The research has a good guiding effect for the welding of duplex stainless steel.

关 键 词：双相不锈钢 热输入 微观组织 相比例 点蚀 

分 类 号：TG457.11[金属学及工艺—焊接]