摘要
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。
The mixed powders of Co-based alloy （stellite-6） and vanadium carbide （VC） are deposited on SUS304 stainless steel using fiber laser and coaxial laser cladding head. The two methods with a constant chemical composition multi-layer cladding and a functionally gradient material multi-layer cladding are investigated comparatively. The results show that the microstructures of the clad layer with the mixed powder of stellite-6 and VC can be classified into hypoeutectic structure and hypereutectic structure according to the concentration of VC; the functionally gradient material multi-layer cladding is an effective method to decrease the crack sensitivity.
出处
《激光与光电子学进展》
CSCD
北大核心
2012年第6期136-142,共7页
Laser & Optoelectronics Progress
基金
辽宁省自然科学基金(20092047)资助课题
关键词
材料
激光熔覆
钴基合金
碳化钒
裂纹敏感性
显微镜结构
materials
laser cladding
Co-based alloy
vanadium carbide
crack sensitivity
microstructure
