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使用自行配制的Ni基合金粉末和混合加入适量其他功能性粉末,采用基体预热和激光同轴送粉熔覆技术,进行在板坯结晶器母体表面熔覆强化的试验研究。结果表明,通过基体预热和激光同轴送粉熔覆强化,可以有效减小预铺再熔覆产生的较多的孔缝现象;可以通过粉末配制控制熔覆层的成分构成,且熔覆层组织致密、均匀,呈典型的快速凝固现象;熔覆层与基体元素相互渗透和稀释,得到了具有良好冶金结合与高致密度的结合过渡区,而且基体稀释率很小;通过此种强化处理可明显提高结晶器的耐磨性和耐蚀性。
Using self-formulated Ni-based alloy powder and mixing the right amount of other functional powders, the experimental study of cladding strengthening on the surface of the slab mold mother body was carried out by using matrix preheating and laser coaxial powder feeding cladding technique. The results show that the microstructure of the cladding layer can be controlled by the preparation of the powder through the preheating of the substrate and the laser cladding strengthening by coaxial powder feeding and cladding, The microstructure of the layer is dense, uniform and shows a typical rapid solidification phenomenon. The interpenetrating and dilution of the cladding layer and the matrix element result in a transition zone with good metallurgical bonding and high density, and the substrate dilution rate is very small. By this strengthening Treatment can significantly improve the mold wear resistance and corrosion resistance.