采用药芯焊丝自保护明孤堆焊方法制备了系列高铬合金,借助光学显微镜、X射线衍射仪、扫描电镜及湿砂耐磨性实验,研究了SiC含量对其性能的影响.结果表明,SiC显著影响其显微组织形态、尺寸、数量及分布.当SiC含量0％～4％(质量分数,下同)时,堆焊层维织晶粒细化,共晶组织(a-Fe+ M3 (C,B))数量增加,耐磨性下降；当其含量增加到8％时,堆焊层组织形成初生M23C6碳化物而改善耐磨性；但当SiC加入量大于12％时,SiC分解出过量的硅原子反而会使焊缝的石墨化倾向增加,抑制初生M23C6碳化物形成,致使耐磨性下降.磨损形貌分析表明,随SiC增加,其磨损方式从凿削为主转变为刮伤与凿削两种方式共存.
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