390MPa级船用高强钢激光-MAG复合焊接接头组织与力学性能  

Microstructure and mechanical properties of weld joints in laser-MAG hybrid welding of 390 MPa grade marine high-strength steel

作　　者：王树森 邹德敏 肖红军[2] 曹洋[2] 朱彦洁 赵琳[2] 彭云[2] Wang Shusen;Zou Demin;Xiao Hongjun;Cao Yang;Zhu Yanjie;Zhao Lin;Peng Yun(Military Representative Office of Shenyang Bureau of PLA Naval Equipment Department in Anshan Anshan 114001,Liaoning,China;Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]海装沈阳局驻鞍山地区军事代表室,辽宁鞍山114001 [2]钢铁研究总院有限公司,北京100081

出　　处：《焊接》2024年第4期58-62,共5页Welding & Joining

基　　金：国家重点研发计划资助项目(2018YFB1107900);钢铁研究总院自主投入研发专项项目(事21H62630B)。

摘　　要：对8 mm厚390 MPa级船用高强钢进行了激光-MAG电弧复合焊接,研究了焊接接头焊缝形状和组织特征,分析了焊接接头硬度分布、拉伸性能和冲击性能。结果表明,激光-MAG复合焊接焊缝呈“酒杯”状,热影响区宽度较小。焊接速度为0.8 m/min时,焊缝区组织主要为先共析铁素体、侧板条铁素体、针状铁素体和板条贝氏体;焊接速度达到1.2 m/min以上时,先共析铁素体和侧板条铁素体比例显著减小,针状铁素体和板条贝氏体比例增加。焊接接头硬度均高于母材,没有明显软化区。激光-MAG复合焊接接头具有良好的低温冲击韧性;随着焊接速度增大,焊缝区-40℃和-60℃冲击吸收能量显著增加。Laser-MAG hybrid welding was carried out in 390 MPa grade marine high-strength steel.Cross-sectional morphologies and microstructures of the weld joints were investigated by stereo microscope and optical microscope,and the hardness and mechanical properties of the welds were analyzed in this study.The results indicate that the weld metal microstructures mainly consist of pre-eutectoid ferrite,sideplate ferrite,acicular ferrite and lath bainite at the welding speed of 0.8 m/min.As the welding speed is 1.2 m/min,the amount of preeutectoid ferrite and side-plate ferrite decreases,whereas that of the acicular ferrite and lath bainite increases.The hardness of the weld joints is higher than those of the base metal,showing no obvious soften zone.Laser-MAG hybrid welds exhibits sound low-temperature impact toughness,and the impact absorbed energy of the weld metal at−40℃and−60℃increases with an increase in the welding speed.

关 键 词：激光-电弧复合焊接 船用高强钢 微观组织 力学性能 

分 类 号：TG456[金属学及工艺—焊接]