316L激光粉末床熔覆IN718偏析带形成过程的模拟

沈盟凯, 董太宁, 葛鸿浩, 石新升, 张群莉, 刘云峰, 姚建华

Simulation of the Formation Mechanism of Segregation Bands During IN718 Cladding on 316L Using Laser Powder Bed Fusion

SHEN Mengkai, DONG Taining, GE Honghao, SHI Xinsheng, ZHANG Qunli, LIU Yunfeng, YAO Jianhua

图12 偏析带形成的示意图

Fig.12 Schematics of the formation of the segregation bands (a) Ta at the rear end of the molten pool tends to Tb (Tp—liquidus temperature of powder; Ta—actual solidification liquidus temperature; Tb—liquidus temperature of matrix; Red and green dots represent Fe element in matrix and in powder, respectively) (b) solidification creates a region of high concentration of Fe element (c) Ta at the rear end of the molten pool tends to Tp (d) solidification creates a region of low concentration of Fe element