高氮无镍奥氏体不锈钢的激光辐照组织  

Microstructrue of High-nitrogen Nickel-free Austenitic Stainless Steel Irradiated by Laser

作　　者：翁建寅[1,2] 彭伟 宁小智 鲍贤勇[2] 李北 董瀚[1,3] WENG Jianyin;PENG Wei;NING Xiaozhi;BAO Xianyong;LI Bei;DONG Han(Central Iron and Steel Research Institute, Beijing 100081,China;Technology Center of FIYTA (Group) Co., Ltd., Shenzhen Guangdong 518057, China;School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China)

机构地区：[1]钢铁研究总院,北京100081 [2]飞亚达(集团)股份有限公司,广东深圳518057 [3]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2020年第3期21-26,共6页Shanghai Metals

基　　金：中国博士后基金(No.2019M651465)。

摘　　要：为了探索高氮无镍奥氏体不锈钢激光焊接的可行性,采用1.0、1.5和2.0 kW功率的激光对含0.092%C、0.59%N、17.69%Cr、13.83%Mn和2.89%Mo(质量分数)的不锈钢试样进行了辐照。对辐照区的熔池、熔合区、热影响区进行了金相检验、背散射电子衍射(EBSD)和硬度测定。结果表明:高氮无镍奥氏体不锈钢熔池呈上宽下窄的形状;用1和2 kW激光辐照的钢熔池的最大深度分别为2.7和3.9 mm。以不同功率激光辐照的钢,熔池区的硬度最低,为320 HV0.2左右,热影响区内再结晶区硬度最高,为350 HV0.2左右,熔合区硬度居于二者之间。此外,熔池内有大量的亚晶,其取向差约为2°~5°。To explore whether laser welding technology is suited to high-nitrogen nickel-free austenitic stainless steel,the stainless steel specimens containing 0.092%C,0.59%N,17.69%Cr,13.83%Mn,and 2.89%Mo by mass were irradiated by lasers of 1.0 kW,1.5 kW and 2.0 kW,then the weld pool,fusion area and heat affected zone in the laser irradiated area were subjected to microstructure survey,EBSD and hardness measurements.The results showed that the weld pool of high-nitrogen nickel-free austenitic stainless steel offered as shape as wide on top and narrow at bottom,and that the greatest depths of the weld pools of the steel irradiated by lasers of 1 kW and 2 kW were respectively 2.7 mm and 3.9 mm.After the steel was irradiated by laser of different powers,the weld pool produced as the lowest hardness as approximately 320 HV0.2,the recrystallized region in HAZ had as the highest hardness as approximately 350 HV0.2,and hardness in the fusion zone was situated between the two.In addition,a large number of sub-grains were present in the weld pool,and their most orientation difference was 2°to 5°.

关 键 词：高氮无镍奥氏体不锈钢 激光辐照 背散射电子衍射 熔池 显微组织 

分 类 号：TG1[金属学及工艺—金属学]