氮气对SAF2507双相不锈钢GTAW焊接接头组织与性能影响  

Effect of N_2 on the microstructure and properties of welded joint in GTAW for SAF2507 duplex stainless steel

作　　者：杜东方[1] 肖峰[1] 孙学杰[1] 刘洁[2] 

机构地区：[1]四川工程职业技术学院,四川德阳618000 [2]太原科技大学,山西太原030024

出　　处：《电焊机》2015年第10期145-149,共5页Electric Welding Machine

基　　金：山西省科技攻关项目(20120321015-02)

摘　　要：采用GTAW焊接SAF2507双相不锈钢,焊丝为ER2594,保护气体为Ar＋N2。研究了保护气体中氮气（φ（N2）=0～5%）比例对SAF2507 GTAW焊接接头组织和性能的影响。结果表明,随着保护气体中N2含量的增加,焊缝组织中奥氏体相增多,硬度下降,耐点腐蚀性能增强;当N2含量到达5%时,产生焊接飞溅和焊接气孔,接头焊缝冲击功降低;采用φ（Ar）＋φ（N2）2%～3%保护的焊接工艺,焊接接头能保持较好的相比例,焊接接头的组织、力学和点腐蚀等综合性能更优。In this paper,SAF2507 is welded by GTAW with ER2594 as filler metal, and the shielding gas is Ar＋N2. The effect of the proportion of N2（φ（N2）0～5%）on the microstructure and mechanical properties of welded joints in GTAW for SAF2507 are studied. The results show that as the content of N2 in the shielding gas increases,the austenitic phase of weld metal increases,the micro-hardness declines and the property of pitting corrosion enhances;When the content of N2 is 5%,there are spatter and pores,and the impact energy of weld metal reduces; by using φ（Ar）＋φ（N2）2%～3% welding parameters,the phase ratio,microstructure,pitting corrosion and mechanical properties of welded joints are better.

关 键 词：氮气 SAF2507 GTAW 力学性能 点腐蚀 

分 类 号：TG407[金属学及工艺—焊接]