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采用光纤激光器和同轴送粉系统在SUS304不锈钢表面制备出钴基合金(Stellite-6)与碳化钒(VC)混合粉末的激光熔覆层。试验中分别采用每层成分不变的多层熔覆工艺(普通熔覆工艺)和每层成分变化的功能梯度熔覆工艺,对比研究了两种熔覆工艺方法的熔覆层裂纹敏感性、组织特征和性能。结果表明,功能梯度熔覆层与普通熔覆层相比较,在成分、组织和性能基本相同的情况下,裂纹敏感性低,能有效地防止裂纹出现;另外,Stellite-6与VC混合合金粉末熔覆层的显微组织根据VC含量的不同,可以分为亚共晶组织和过共晶组织。
Laser cladding of Co-based alloy (Stellite-6) and vanadium carbide (VC) mixed powder was prepared on the surface of SUS304 stainless steel by fiber laser and coaxial powder feeding system. In the experiment, the function of the cladding layer with different composition of each layer was changed to the multilayer with the same cladding layer (normal cladding) Tissue characteristics and performance. The results show that the functionally graded layer is less sensitive to cracks than the conventional cladding layer when the composition, microstructure and properties are basically the same, which can effectively prevent the occurrence of cracks. In addition, Cladding microstructure according to the VC content of different, can be divided into hypoeutectic and hypereutectic structure.