Structure and high-temperature property of amorphous composite coating synthesized by laser cladding FeCrCoNiSiB high-entropy alloy powder

A novel amorphous composite coating was synthesized successfully on low carbon steel by laser cladding FeCrCoNiSiB high-entropy self-fluxed alloy powder. The combination of impact wear and XRD was adopted as a novel method to observe the crystalline phases of the coating. The research focused on the microstructure and high-temperature wear behavior of the two characteristic layers in the fabricated coatings. The amorphous/crystalline layer as the upper layer was composed of amorphous phase and face-centered cubic gamma(Fe, Ni) phase, while body-centered cubic (Co, Fe) solid solution phases with carbides and borides precipitates preferred to appear in the bottom layer. The volume fraction of amorphous phase was approximately 49% in the upper layer, which gave birth to a novel wear mechanism and remarkably improve the wear resistance in high-temperature service environment. (C) 2017 Published by Elsevier B.V.