高硬度高耐磨自保护金属芯堆焊焊丝  

Self-shielded metal cored wire for hardfacing with high hardness and abrasion resistance

作　　者：蒋旻[1] 栗卓新[1] 蒋建敏[1] 史耀武[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022

出　　处：《焊接学报》2006年第1期69-71,共3页Transactions of The China Welding Institution

基　　金：北京市自然科学基金资助项目(2042003)

摘　　要：研制一种焊接工艺性能良好的高铬铸铁型自保护金属芯堆焊焊丝,堆焊层硬度大于60 HRC,耐磨性为Q235钢的21倍。对其自保护机理进行了研究,当粉芯中金属Mn含量达到5%时,可保证焊缝表面不出现气孔,当钛铁含量超过10%时,焊缝表面出现压坑。堆焊层显微组织为马氏体+残余奥氏体,在马氏体基体上均匀分布着M7C3型耐磨硬质相。The high-chromium cast iron type self-shielded metal cored wire(SSMCW)for hardfacing with good operative performance and appearance was developed.The hardness of deposited metal exceeds HRC60,and the wearing resistance is 21 times higher than that of Q235 steel.The mechanism of selfshielding was researched.When manganese content arrives at 5wt% in wire,porosity can be avoided,while TiFe content exceeds 10wt%,pits will appear in the weld of SSMCW.The microstructure of deposited metal consists of martensite and a little residual austenite,and the abrasive resistant hard phase M_7C_3 distributes uniformly in martensite matrix.

关 键 词：高硬度 高耐磨 自保护金属芯堆焊焊丝 

分 类 号：TG422.3[金属学及工艺—焊接]