节镍型双相不锈钢2101激光焊工艺研究  

Study on laser welding technology of 2101 nickel-saving duplex stainless steel

作　　者：何艳兵 黄忠宝 王凯 罗家植 林传冬 韩琦 HE Yan-bing;HUANG Zhong-bao;WANG kai;LUO Jia-zhi;LIN Chuan-dong;HAN Qi(Guangzhou Risong Intelligent technonlogy holding Co.,Ltd.,Guangzhou 510000,Guangdong pro.,China;Zhejiang Yinlun Machinery Co.,Ltd.,Taizhou 317200,Zhejiang pro.,China)

机构地区：[1]广州瑞松智能科技股份有限公司,广东广州510000 [2]浙江银轮机械股份有限公司,浙江台州317200

出　　处：《焊接技术》2021年第6期38-42,I0011,I0012,共7页Welding Technology

基　　金：广州开发区国际科技合作项目(20RD02,0120IY01);广州瑞松智能科技股份有限公司激光焊接工艺及装备开发项目(0121ZY01)。

摘　　要：文中利用光学显微镜和扫描电镜等方法研究了2101节镍型双相不锈钢在不同激光焊热输入下的显微组织和力学性能、耐蚀性。结果表明:2101双相钢激光焊焊缝由奥氏体和铁素体组成,其中奥氏体形貌和数量分布与热输入密切相关。接头热影响区的奥氏体形貌以块状、条带状混合为主。当热输入为34.2 J/mm时,焊缝主要为铁素体,少量奥氏体呈块状分布于柱状晶和等轴晶晶粒内部;当热输入为5070 J/mm时,焊缝中奥氏体数量增多,在晶内呈块状,在晶界则为条带状、羽毛状;进一步增大热输入,焊缝内奥氏体数量增加,分布愈加密集。力学性能和电化学测试结果表明,焊缝为接头力学性能薄弱区域,接头的耐蚀性随热输入的增大而逐渐降低。热输入为5070 J/mm的焊缝强度可达到800 MPa以上,断口内分布着尺寸均匀的韧窝,具有良好的强度、硬度、塑性和耐蚀性匹配。In this paper, the microstructure, mechanical properties and corrosion resistance of 2101 Nickel-saving duplex stainless steel with different laser welding heat inputs were studied by OM, SEM and other technologies.The results showed that the microstructure of joint was consisted of austenite and ferrite. The morphology and quantity of austenite were closely related to heat input. The austenite morphology in HAZ was mainly massive and banded. The welding with 34.2 J/mm was mainly composed of ferrite, and a small amount of austenite was distributed in the columnar and equiaxed grains. When the heat input was 50 ~70 J/mm, the amount of austenite in the weld increased, and it was massive in the grain boundary, and banded and feathery at the grain boundary. With increasing of heat input, the number of austenite grains in welding increased, and the number of austenite grains also increased. The mechanical and electrochemical tests showed that the weld was the weakest zone of mechanical properties in joint. And the corrosion resistance of the joint decreased gradually with the increase of heat input. The joint with 50 ~70 J/mm had good strength, plasticity, hardness and corrosion resistance, whose strength could reach more than 800 MPa, and dimples with uniform size were distributed in the fracture surface.

关 键 词：热输入 铁素体 奥氏体 力学性能 耐蚀性 

分 类 号：TG456.7[金属学及工艺—焊接]