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为了研究高氮钢激光焊接接头焊缝区组织、性能特性,利用CO2激光对1Cr22Mn16N高氮钢进行了焊接,研究了焊接热输入和保护气体组成对焊缝组织、性能的影响。结果表明,高氮钢激光焊接焊缝组织均为奥氏体和少量的δ铁素体。当焊接热输入增大时,δ铁素体的尺寸显著增大。高氮钢激光焊接接头均没有出现软化区。随着热输入的减小,焊缝区的平均硬度升高;随着保护气体中氮气比例增大,焊缝区的硬度增加。当热输入减小时,焊缝韧性上升,而保护气体的组成对焊缝冲击吸收功的影响不大。
In order to study the microstructure and performance characteristics of the weld zone of high nitrogen steel laser welded joints, 1Cr22Mn16N high nitrogen steel was welded by CO2 laser. The effects of welding heat input and shielding gas composition on the microstructure and properties of the weld were studied. The results show that the weld microstructure of high nitrogen steel is both austenite and a small amount of δ-ferrite. As welding heat input increases, the size of δ ferrite increases significantly. High nitrogen steel laser welded joints are no softening zone. As the heat input decreases, the average hardness of the weld zone increases; as the proportion of nitrogen in the shield gas increases, the hardness of the weld zone increases. When the heat input decreases, the weld toughness increases, while the composition of the protective gas has little effect on the weld impact energy absorbed.