摘要
分别采用ER50-6焊丝和GM120焊丝对刃具钢30CrMnB进行CO2气体保护焊,研究焊接接头的力学性能和组织。结果表明:采用ER50-6焊丝焊接的接头强度大于焊材强度,小于母材强度;焊缝和热影响区的冲击功是母材的1.3~4倍;焊缝硬度低于热影响区和母材的;焊缝组织为粒状贝氏体+先共析铁素体。采用GM120焊丝焊接的接头强度同焊材强度相当,但小于母材强度;焊缝和热影响区的冲击功是母材的1.2~1.7倍;焊缝硬度高于细晶区的但低于粗晶区的,焊缝组织为细小的板条贝氏体+马氏体组织。
30CrMnB of cutting tool steel were welded by CO2 gas-shield welding with ER50-6 welding wire and GM120 welding wire respectively. The mechanical properties and microstructure of the welded joints were studied. The results show that the strength of the joint welded with ER50-6 wire is bigger than that of welding material and less than that of base material;the impact energy of weld and HAZ is 1.3-4 times of that of the base metal;the hardness of weld is lower than that of heat affected zone and base metal;the weld microstructure is granular bainite+proeutectoid ferrite. The strength of the joint welded with GM120 wire is similar to that of welding material but less than that of base material;the impact energy of weld and HAZ is 1.2-1.7 times of that of the base metal;the hardness of weld is higher than that of fine crystal zone but lower than that of coarse crystal zone, the weld microstructure is fine lath bainite and martensite.
作者
姚宙
刘红艳
杜琦铭
张卫攀
徐桂喜
YAO Zhou;LIU Hongyan;DU Qiming;ZHANG Weipan;XU Guixi(Technical Center of HBIS Group Han Steel,Handan 056000,China)
出处
《热加工工艺》
北大核心
2020年第23期122-124,133,共4页
Hot Working Technology
基金
国家重点研发计划项目(2017YFB0304004)。
