【摘要】 为了改善Fe-0.3C-15Cr-1Ni合金涂层的硬度和耐蚀性能。采用激光熔覆技术在3Cr13不锈钢基体表面熔覆添加不同含量（Cr₃C₂+Ti）（0,0.5%,1%,2%）原位合成含有TiC的不锈钢基高硬度耐蚀涂层，利用金相显微镜（OM）、扫描电子显微镜（SEM）、X射线衍射仪（XRD）、显微硬度仪、电化学工作站等设备研究不同含量（Cr₃C₂+Ti）对熔覆层的微观结构、相组成、硬度分布及耐蚀性能的影响。结果表明：熔覆层与3Cr13不锈钢基体间界面冶金结合良好。加入（Cr₃C₂+Ti）后熔覆层的树枝晶和柱状晶转变为胞状晶和等轴晶；碳化物由鱼骨状和块状转变为棒状和颗粒状，且数量减少，其类型由低碳型碳化物向高碳型碳化物转变。随着（Cr₃C₂+Ti）含量的提高，熔覆层的硬度先升高后降低，点蚀电位先升高后降低，钝化区宽度先增大后减小。结果表明在Fe-0.3C-15Cr-1Ni合金粉末中添加（Cr₃C₂+Ti）可显著提高马氏体不锈钢基涂层硬度和耐蚀性能，当（Cr₃C₂+Ti）含量为0.5%时，熔覆层的综合性能最好。更多还原

【Abstract】 The study aims to improve the hardness and corrosion resistance of Fe-0.3C-15Cr-1Ni alloy coatings.Stainless steel-based and TiC-containing coatings with high hardness and corrosion resistance were in-situ synthesized by the laser cladding technique on the surface of 3Cr13 stainless steel substrate with different contents of（Cr₃C₂+Ti）（0,0.5%,1%,2%）.A Metallographic microscope（OM）,a scanning electron microscope（SEM）,an X-ray diffractometer（XRD）,a microhardness tester, an electrochemical workstation and other equipment were used to study the effects of different contents of（Cr₃C₂+Ti） on the microstructure, phase composition, hardness distribution and corrosion resistance of the clad layers.The results show that the interfacial metallurgical bonding between the clad layer and the 3Cr13 stainless steel matrix is good.With（Cr₃C₂+Ti） added, the dendrites and columnar crystals of the clad layer were changed to cytosolic and equiaxed crystals; the carbides were changed from herringbone and massive to rod and granular, from low-carbon carbides to high-carbon carbides and declined in number.With the increase of（Cr₃C₂+Ti） content, the hardness of the clad layer, the pitting potential and the width of the passivation zone increase first and then decrease.The results show that the addition of（Cr₃C₂+Ti） to Fe-0.3C-15Cr-1Ni alloy powder can significantly improve the hardness and corrosion resistance of the martensitic stainless steel-based coatings.The overall performance of the clad layer is the best when the（Cr₃C₂+Ti） content is 0.5%.更多还原