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Shuyao Duan,Xiaohong Zhan,Mengyao Wu,Hengchang Bu,Qiyu Gao 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.3
The evolution of element distribution during laser cladding involves two dynamic behaviors, i.e., liquid molten pool flow andFeCoCrNi high-entropy alloy (HEA) coatings solidification. However, it is quite difficult to characterize element distributionduring the flow of the liquid molten pool rigorously. The current investigation conducted the optical microscopy, scanningelectron microscopy, X-ray diffraction analysis and energy dispersive spectrometer to study the dilution, phase composition,microstructure of the FeCoCrNi coatings. The flow field was simulated to uncover the dynamic change mechanism of themolten pool and explain the experimental results. The results indicated that the coating is substantially composed of FCCand BCC solid solution with a typical dendrite microstructure. Gray Laves phase-(Ni, Co)2Ti and a small number of whitedot particles, Fe–Cr phase, are dispersed in the inter-dendritic region. The HEA atoms (Fe, Co, Cr, Ni) gradually aggregatefrom the center to the side at the coating boundary region, while the Ti atom is the opposite. The Marangoni flow inflectionpoint at the molten pool boundary will cause HEA atoms to aggregate. On the contrary, Ti atom enters the molten poolfrom the bottom with the heat buoyance flow and then migrates to the boundary along with the Marangoni flow. Therefore,the content of Ti in the coating boundary decreases. The Marangoni flow, heat buoyance flow, and recoil pressure flow areinterwoven in the middle region of the coating, resulting in a more uniform element distribution than the boundary region.
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