二氧化碳堆焊铁基合金组织和性能的研究

Microstructure and performance of carbon dioxide surfacing iron base alloy

为了进一步提高Fe55自熔性合金粉末的性能,利用二氧化碳保护焊在45#钢上堆焊Fe55自熔性合金粉末以及Fe55与碳化钨、碳化硅的混合粉末。利用XJL-02A金相显微镜对焊缝区的显微组织进行观察对比,采用2500PCX-ray衍射仪对堆焊层金属的物相成分进行分析,对堆焊层的显微硬度、耐磨性进行测试。结果表明,Fe55+15%W+6%SiC堆焊层与基体实现了冶金结合,堆焊层组织为马氏体和残余奥氏体,并有W3Cr12Si5、Cr3Si等增强相。显微硬度达913HV,耐磨性较Fe55提高2倍。

In order to further improve the property of Fe55 self-fluxing alloy powder.This paper,by using CO2 gas shielded welding,Fe55 self-fluxing alloy powder and the mixture powder of Fe55,WC and SiC were surfaced on 45# steel.Weld microstructure was observed using XJL-02A optical microscope,composition of hardfacing layer was analyzed using 2500PC XRD.Micro hardness of hardfacing layer and wear resistance were measured.The results show that the metallurgical bonding is realized between Fe55＋15%W＋6%SiC hardfacing layer and base,the microstructure of hardfacing layer is martensite and austenite,the strengthening phase is W3Cr12Si5,Cr3Si,etc.Micro hardness reaches 913HV.Wear resistance is twice than that of Fe55.