不同焊接参数对ZG29MnMoNi钢表面堆焊过渡层组织的影响  

Effect of welding parameters on microstructure of surfaced transition layer on ZG29MnMoNi steel

作　　者：陶亚平[1] 周杰[1] 曹金豆 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《金属热处理》2015年第8期164-167,共4页Heat Treatment of Metals

基　　金：国家自然科学基金面上项目(51275543);国家科技部重大专项(2012ZX04010-081)

摘　　要：在ZG29Mn Mo Ni钢基体堆焊RMD142焊材制造模具,通过控制变量法探讨了堆焊电流、堆焊电压和堆焊速度不同参数对过渡层组织和晶粒的影响,使过渡层获得最佳的显微组织和性能。试验结果表明,过渡层组织随着堆焊电流的增加变得粗大,马氏体数量明显减少,铁素体数量增多,但随堆焊电压的增加变化不大;堆焊速度越慢,过渡层的组织越粗大,但堆焊速度越大,残留奥氏体增多导致硬度下降。最佳的堆焊参数为:堆焊电流为400 A、堆焊电压为32 V和堆焊速度为500 mm/min。Surfacing experiment was carried out on ZG29MnMoNi steel using RMD142 welding material for die making. Effects of welding current, welding voltage and welding speed on microstructure of the surfaced transition layer were investigated by control variable method and preferable microstructure and properties of the surfaced transition layer were obtained. The experimental results show that with the welding current increasing, grain size of the surfaced transition layer becomes coarse, the martensite content reduces and the ferrite content increases, and with the welding voltage increasing, the microstructure not change much; with the welding speed reducing, the microstructure becomes coarse, however with the welding speed increasing, the residual anstenite increases which results in the decrease of hardness. It is concluded that the suitable welding parameters should be 400 A for welding current, 32 V for welding voltage and 500 mm/min for welding speed.

关 键 词：ZG29MnMoNi钢 堆焊电流 堆焊电压 堆焊速度 显微组织 

分 类 号：TG455[金属学及工艺—焊接]