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所属单位：材料科学与技术学院
发表刊物：Opt Laser Technol
摘要：Invar alloys are widely used in the aerospace, but their manufacturability and mechanical properties are not well understood when they are employed in additive manufacturing. The laser melting deposition (LMD) technology is utilized to the surface repair of Invar alloys. In this work, the microstructure evolution, quantitive subgrain size, as well as the subgrain orientation are investigated using optical microscopy. Moreover, the effect of partially remelting of successive layers is exhibited. It is explicit that the cellular crystal orientation is strongly influenced by the heat flow which is subject to the scanning direction. Considering to the basic laws of Invar alloy microstructure evolution during LMD process, the relations between heat input and produced subgrain characteristics are further elucidated. The results show that a slight increase of λ from 4.4 μm to 5.2 μm at the function of heat input varied from 98.6 J/mm2 to 114 J/mm2. Moreover, it was notable that a reverse change in the dimension discrepancy of remelted and non-remelted subgrains occurred with two kinds of heat input. © 2018 Elsevier Ltd
ISSN号：0030-3992
是否译文：否
发表时间：2019-01-01
合写作者：齐超琪,周俊杰,刘立君,顾冬冬
通讯作者：占小红