为了在降低熔覆层裂纹敏感性的同时获得低稀释率熔覆层,用微束等离子弧热源在低碳钢圆管表面熔覆12层NiCrBSi,成形后利用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)对多层熔覆的熔覆 层的微观组织、元素分布及相组成进行了分析.结果表明,采用微束等离子弧熔覆得到的多层熔覆主要由γ-Ni,Ni_3B,Cr_(21.34)Fe_(1.66)C_6和Cr_2B_3相组成,其中的强化相弥散分布;无气孔和裂纹,层与层间结合致密,分层未见明显;焊缝组织均匀,晶粒细小,稀释率低,热影响区很小.
In order to lower the crack sensitivity and obtain the coating with low dilution rate, micro-plasma arc cladding process was employed to clad a 12-layer NiCrBSi coating on the surface of low carbon steel pipe. Scanning electron microscopy ( SEM ) , energy dispersive spectroscopy ( EDS ) and X-ray diffraction ( XRD ) were employed to analyze the composition and microstructure of the coating. Results show that the phase of the coating is composed of γ- Ni solid solution, nickel boride Ni_3B, carbide Cr_(21.34)Fe_(1.66)C_6 and Cr_2B_3 type chromium boride. The coating has no cracks and does not exhibit porosity; the bonding between layers is compact and the boundaries are not observed. The coating is featured by a homogenized microstructure, small grain and no evident heat-affected zone.
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