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所属单位：材料科学与技术学院
发表刊物：MATERIALS RESEARCH EXPRESS
关键字：laser melting deposition deposition porosity microstructure component enrichment invar alloy
摘要：Laser melting deposition with different parameters was performed on invar alloy powder and substrate by KUKA Robot with a fiber laser of YSL-6000. The deposition porosity, microstructure and component enrichment behavior were studied. It revealed that the deposition porosity could be effectively controlled with laser power of 2300 W and scanning speed of 1.5 mm s(-1). The microstructure evolution suffered from elongate cellular crystal to equiaxed cellular crystal, while the constitutional supercooling increased from initial solidification to final solidification. The component enrichment behavior was observed near the surface of deposition layer measured by EDS. The ferrum content near the surface reached the highest value 64.39 wt%, but only 62.52 wt% in the center. In addition, the distribution of ferrum component and Vickers hardness along the center line of deposition layer were investigated. It was also found that the component content in the top of deposition layer is highest similar to 57%. The decrease tendency of microhardness (in a range of 96.1 to 110.5 HV) from the bottom to the top of DL is performed. The marangoni convection behavior, that is slower velocity at the edge, is the key factor that dominated the ferrum distribution.
ISSN号：2053-1591
是否译文：否
发表时间：2018-11-01
合写作者：Zhou, Junjie,Qi, Chaoqi,顾冬冬
通讯作者：占小红