Abstract
The influences of laser rapid solidification and annealing treatment at 600-1000℃on the microstructure and properties of laser clad FeCoNiCrAl_2Si high-entropy alloy coating were investigated.The experimental results indicate that the precipitation of intermetallic compounds in the coating could be effectively inhibited by laser cladding with rapid solidification.The coating had simple ordered bcc solid solution phases with high microhardness(900 HV_(0.5)),good high temperature phase stability and softening resistance.The coating was mainly composed of dendrites,Fe,Cr and Si are enriched in interdendritic region,Ni,Co and Al are enriched in dendritic region.As the annealing temperature increase,the segregations of Al and Si increase,but segregations of Fe,Cr,Ni and Co changed little.Massive low angle grain boundaries were distributed at the interface between dendritic and interdendritic microstructures.After annealing at 600℃for 5 hours,the microstructure was greatly refined,and the grain boundary misorientation converted from low to high angles.
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