工艺参数对718钢堆焊组织和性能的影响  

Effect of process parameters on microstructure and properties of 718 steel by surfacing

作　　者：韩丽梅 李丽 田猛 唐家龙 Han Limei;Li Li;Tian Meng;Tang Jialong(Institute of Research of Iron and Steel,Jiangsu Province and Sha Steel,Zhangjiagang 215625,Jiangsu,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《焊接》2019年第11期44-49,I0025,共7页Welding & Joining

摘　　要：针对磨损失效的718材质侧导板,采用气体保护焊对其受损工作面进行堆焊修复,研究工艺参数对堆焊层组织和性能的影响,优化工艺方案。结果表明,在不同的焊接保护气和焊接热输入下,堆焊层金属均与母材熔合良好,无焊接缺陷。堆焊层组织主要由马氏体及少量铁素体和残余奥氏体组成,其显微硬度和耐磨性均高于母材。焊接保护气为20%CO2+80%Ar的堆焊层耐磨性高于焊接保护气为100%CO 2的堆焊层耐磨性,大热输入的堆焊层耐磨性高于小热输入的堆焊层耐磨性,其中选择20%CO2+80%Ar焊接保护气、大热输入的焊接工艺作为最佳的堆焊修复方案。Aiming at the side guide plate of 718 material with wear failure,the gas shielded welding technology was used to repair the damaged working face,and influence of process parameters on microstructure and properties of the surfacing layer was studied to optimize the process scheme.The results showed that,under different welding shielding gas and welding heat input,the surfacing layer metal was well fused with the base metal and there was no welding defect.Microstructure of the surfacing layer was mainly composed of martensite,a small amount of ferrite and retained austenite,and its microhardness and wear resistance were higher than those of base metal.Wear resistance of the surfacing layer with welding protection gas 20%CO2+80%Ar was higher than that of the surfacing layer with welding shielding gas 100%CO2,and wear resistance of the surfacing layer with large welding heat input was higher than that of the surfacing layer with small welding heat input.

关 键 词：堆焊修复 耐磨性 焊接保护气 焊接热输入 

分 类 号：TG457.11[金属学及工艺—焊接]