采用等离子堆焊技术在304L不锈钢表面堆焊Ni-Cr-B-Si合金粉末熔覆层.应用扫描电子显微镜、电子探针、X-射线衍射仪、显微硬度计等测试手段,研究两种Ni-Cr-B-Si系合金成分等离子堆焊层组织结构和显微硬度.结果表明:堆焊合金层组织由γ-Ni树枝晶和树枝晶间多元共晶组成；Cr,C,B和Si元素含量增加,树枝状组织含量大幅减少,碳化物和硼化物含量显著增加.硬度测试结果表明:硼化物和碳化物含量增大使得堆焊层硬度显著提高.
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