高氮钢复合焊接焊缝氮含量与接头性能研究  

Research on the Nitrogen Content in Weld and Joint Properties in Hybrid Welding of High Nitrogen Steel

作　　者：杨炙坤 宁凯 钟淳亮 李星燃 刘凤德[1] 张宏[1] Yang Zhikun;Ning Kai;Zhong Chunliang;Li Xingran;Liu Fengde;Zhang Hong(College of Mechanical and Electric Engineering,Changchun University of Science and Technology,Changchun 130022,China;Inner Mongolia First Machinery Group Co.,Ltd.,Baotou,Inner Mongolia 014032,China)

机构地区：[1]长春理工大学机电工程学院,吉林长春130022 [2]内蒙古第一机械集团有限公司,内蒙古包头014032

出　　处：《应用激光》2022年第4期1-6,共6页Applied Laser

基　　金：吉林省教育厅“十三五”科学技术项目(JJKH20190561KJ)。

摘　　要：高氮钢焊缝中氮含量是影响其力学性能的重要因素。为解决高氮钢焊接时氮含量下降导致焊缝力学性能恶化的问题,以12 mm厚高氮钢板为对象开展激光-电弧复合焊接试验,通过改变焊接填充材料研究了氮含量对焊缝组织和力学性能的影响。结果表明:使用含氮焊丝可以有效补充焊缝中的氮损失,含氮焊丝的焊缝氮含量较高,在焊缝激光区,采用两种焊丝获得的焊缝氮含量均随着激光功率增加而增大。两种焊丝获得的焊缝组织均为奥氏体+少量铁素体。采用不锈钢焊丝获得的焊缝抗拉强度随激光功率增加而增大,采用含氮焊丝获得的焊缝抗拉强度随着激光功率增加呈先增大后减小的趋势,最大抗拉强度达953 MPa,焊缝断口均呈典型的韧性断裂特征。采用两种焊丝获得的焊缝冲击性能差异较大,冲击断口均具有明显韧性断裂特征。The nitrogen content in the weld of high nitrogen steel is an important factor affecting its mechanical properties. It is a fact that mechanical properties of weld deteriorate with the decrease of nitrogen content in welding of high nitrogen steel. In order to solve this problem, the laser arc hybrid welding experiment was carried out on 12 mm thick high nitrogen steel plates, and the effect of nitrogen content on the microstructure and mechanical properties of weld was studied by changing filler materials. Results show that the use of nitrogen-containing welding wire can effectively supplement and the nitrogen loss in the weld. The nitrogen content of welding seam of nitrogen welding wire is higher in the laser zone, the nitrogen content of both welding wires increases with the increase of laser power. The weld microstructure of the two kinds of welding wires is austenite and a little ferrite. The tensile strength of stainless steel welding wire increases with the increase of laser power, and the tensile strength of nitrogen-containing welding wire first increases and then decreases with the increase of laser power. The maximum tensile strength reaches 953 MPa. The fracture surface of weld shows typical ductile fracture characteristics. The weld impact properties of the two kinds of welding wires are quite different, and the impact fracture has obvious ductile fracture characteristics.

关 键 词：高氮钢 激光-电弧复合焊 氮含量 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]