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

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。

Abstract: The high-chromium cast iron type self-shielded metal cored wire(SSMCW) for hard facing 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 self-shielding 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 M₇C₃ distributes uniformly in martensite matrix.