Experimental Study on Force and Surface Morphology of Additive Manufacturing FeCoNiCrAl0.5 High Entropy Alloy

Abstract

FeCoNiCrAl0.5 high-entropy alloy (HEA) specimens were prepared by laser powder bed fusion (L-PBF) under different laser process parameters, and their physical phases, microstructures, and defects were investigated. Micro-grinding experiments were designed to explore the effects of varying laser parameters on the micro-grinding performance of L-PBF-HEAs by analyzing the micro-grinding force and roughness and observing the surface morphology. The experimental results show that the internal defects of L-PBF-HEA FeCoNiCrAl0.5 decrease as the laser power increases, and increase when the laser scanning spacing and scanning speed increase. When the laser power is increased, the micro-grinding force shows a growing trend, the Ra decreases and then increases, and the surface morphology flatness improves; when the laser scanning spacing increases, the micro-grinding force decreases, the Ra increases, and the surface morphology deteriorates; when the laser scanning speed increases, the micro-grinding force increases and then decreases, and the Ra decreases and then increases, and the surface morphology improves relatively.