工程机械刃具钢30CrMnB焊接接头的显微组织和力学性能  

Microstructure and Mechanical Properties of Welded Joints of Construction Machinery Cutting Tool Steel 30CrMnB

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)

机构地区：[1]河钢集团邯郸公司技术中心,河北邯郸056000

出　　处：《热加工工艺》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)。

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.

关 键 词：30CrMnB 焊接接头 显微组织 力学性能 

分 类 号：TG444.73[金属学及工艺—焊接] TG457.11