304L奥氏体不锈钢搅拌摩擦焊与TIG焊接头的微观组织与性能  

Microstructure and Tensile Properties of 304L Austenitic Stainless Joints Produced by Friction Stir Welding and Tungsten Inert-Gas Welding

作　　者：徐蒋明[1] 徐春容[2] 樊保全 王世忠[2] 

机构地区：[1]中国核动力研究设计院,成都610213 [2]中国核动力研究设计院反应堆燃料及材料重点实验室,成都610213

出　　处：《核动力工程》2016年第1期57-61,共5页Nuclear Power Engineering

基　　金：中国核动力研究设计院探索基金资助(ZK091)

摘　　要：采用搅拌摩擦焊和钨极惰性气体保护电弧焊(TIG)分别对3 mm厚304L奥氏体不锈钢进行焊接,对比分析2种焊接方法下接头的微观组织和抗拉强度。304L不锈钢的搅拌摩擦焊焊接接头由焊核区、热力影响区、热影响区及轴肩变形区组成;焊核区组织为均匀细小的动态再结晶组织,热力影响区组织发生明显的塑性变形,而热影响区仅受到热的作用晶粒有所长大;TIG焊接头组织由呈胞状树枝奥氏体晶和呈蠕虫状或板条状铁素体组成。结果表明:2种焊接方法获得的接头强度相似,都略高于母材强度。3 mm thick 304L austenitic stainless steel plates were welded by Friction Stir Welding （FSW） and Tungsten Inert-Gas Welding（TIG） respectively, then the microstructure and tensile properties of the welding joints of the two different types of welding were compared and analyzed. The results of the comparison and the analysis show that the FSW welding joint microstructures is composed of four regions, welded nugget zone, thermal-mechanically affected zone （TMAZ）, heat affected zone （HAZ）, and shoulder affected zone（SAZ）. And the microstructure in the nugget is uniform fine-scale equiaxed recrystallisation grain, and the materials in TMAZ underwent plastic deformation, but the materials in HAZ just underwent heat effect. The TIG nugget includes cellular dendrite austenitic, lath ferrite or vermicular ferrite. The tensile properties of FSW joints is the same as those of the TIG joints, and both of the tensile properties of the two types of welding i oints are slightly higher than those of the base materials of the welding joints.

关 键 词：304L奥氏体不锈钢 搅拌摩擦焊 TIG焊 微观组织 性能 

分 类 号：TL374.5[核科学技术—核技术及应用]