中厚度高氮钢激光-MIG复合焊接头组织与性能研究  

Microstructure and Mechanical Properties of Welded Joints of Mid-thickness High Nitrogen Steel by Laser-MIG Hybrid Welding

作　　者：马志华[1] 陈东高[1] 刘红伟[1] 郭海林[1] 杨武林[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《热加工工艺》2014年第11期194-196,共3页Hot Working Technology

摘　　要：采用激光-MIG复合焊接方法,对20 mm厚的高氮奥氏体不锈钢板进行对接焊,分析了焊接接头的组织、硬度、力学性能及断口形貌。结果表明,复合焊接热影响区和焊缝组织均为奥氏体和少量δ-铁素体,热影响区较窄,软化区较小,硬度较为均匀;焊接接头抗拉强度达到母材的93.8%,断裂于焊缝区,拉伸断口形貌为明显的韧窝状。Hybrid laser-MIG welding was to weld 20 mm thickness high nitrogen austenite stainless steel plates. The microstructure, hardness, mechanical properties and fraetography of welded joints were researched. The results show that the microstructure of heat affected zone and weld metal is austenite and δ-ferrite, and the heat-affected zone of welded joints is narrow. Its softening zone is smaller. The hardness is more uniform. The tensile strength of the welded joints is 93.8% of the base material, fractured in the weld zone. The tensile fractography are obviously dimple.

关 键 词：高氮奥氏体不锈钢 激光-MIG复合焊 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]