采用焊丝与合金粉块相结合的堆焊方法在Q235钢表面堆焊合金粉块熔覆层,用金相显微镜、X射线衍射(xRD)、光谱仪、俄歇电子能谱、扫描电镜(SEM)、磨料磨损试验机和洛氏硬度仪等手段对高铬合金堆焊层的微观组织及耐磨性进行表征,研究了Ti对高铬合金堆焊层组织与耐磨性的影响.结果表明:高铬合金堆焊层组织主要由α-Fe、γ-Fe和碳化物、碳氮化物组成,且在α-Fe基体间分布着细小的碳氮化物Tix(N,C)y;当堆焊层中Ti含量约为3％时其洛氏硬度(HRC)达60,磨损量为0.2066 g;随着Ti含量的提高堆焊层的碳化物、碳氮化物的数量随之增加.碳化物、碳氮化物硬质颗粒在磨损过程中起耐磨骨架的作用,硬质颗粒和基体的良好匹配有效阻碍磨粒对堆焊层的显微切削磨损,从而提高了堆焊层的耐磨性.
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