高氮钢复合焊接接头组织与力学性能研究

摘要/Abstract

摘要： 热输入对焊接接头组织与力学性能有重要影响。采用激光-电弧复合焊接方法，研究了不同电弧能量和激光能量下的接头组织、焊缝氮含量、拉伸与冲击性能及接头显微硬度。研究表明：焊缝组织为奥氏体+少量δ铁素体，焊缝中析出的δ铁素体随热输入加大而增多；当电流达到200A后，熔池液态金属中氮的溶解近于饱和，即使焊接电流增大，焊缝氮含量依然趋于恒定；而当激光功率增至2.0kW后，焊接过程中的匙孔维持在稳定状态，焊缝氮含量也近于恒定；拉伸断裂位置均在焊缝区，当焊接电流为200A时，平均拉伸强度最高，达到967.58MPa，当激光功率为1.6kW时，平均拉伸强度可达962.88MPa；焊缝冲击功随激光功率的增大呈先降低后升高的变化趋势，但随电流的增大其变化趋势相反；熔合线的冲击功随着焊接参数的变化呈现出相同的变化趋势，焊缝和熔合线的最大平均冲击功分别为47.60J和62.85J；拉伸和冲击的断裂形式均为韧性断裂；焊缝区显微硬度最低，导致拉伸测试时均断裂于焊缝区。

关键词: 激光-电弧复合焊接, 高氮钢, 显微组织, 力学性能

Abstract: Heat input had a significant effect on microstructure and mechanics properties of welded joint. The joint microstructure, weld nitrogen content, tensile and impacted properties and the micro hardness of joint were studied by laser-arc hybrid welding while the arc and laser energy were different. The results show that the weld microstructure is made up of austenite and a small amount of δ ferrite. The delta ferrite deposited from weld is increased by the increasing heat input. After the current reaches 200A, the dissolution of nitrogen in liquid metal molten pool is close to saturation; and even if the welding current is added, the weld nitrogen content still tends to be constant. When the laser power is increased to 2.0kW, keyhole remains at a stable state in the welding processes, and weld nitrogen content is approximate to constant. Tensile fracture location is in the weld zone. When the welding current is as 200A, the highest average tensile strength reaches 967.58MPa. When laser power is as 1.6kW, the average tensile strength may reach 962.88MPa. The weld impact energy shows a first decrease and then increase with increasing laser power, but the variation tendency is opposite along with increasing current. The variation tendency of impact energy of the weld fusion line is the same as that of the weld zone and changes with the welding parameters. The highest average impact energy of the weld and the weld fusion line are as 47.60J and 62.85J separately. All tensile and impacted fracture mode is of ductile fracture. The micro hardness of weld area is lowest so that the fracture area of tensile test is located at the weld zone.

Key words: laser-arc hybrid welding, high nitrogen steel, microstructure, mechanics property

中图分类号:

TG456.7

王力锋, 刘凤德, 刘双宇, 张宏, 刘薇娜, 田淼磊, . 高氮钢复合焊接接头组织与力学性能研究[J]. 中国机械工程.

Wang Lifeng, , Liu Fengde, Liu Shuangyu, Zhang Hong, Liu Weina, Tian Miaolei, . Study on Welded Joint Microstructure and Mechanics Properties of High Nitrogen Steels for Laser-arc Hybrid Welding[J]. China Mechanical Engineering.

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