Investigation of Optimum Fabrication Condition of High-Entropy Alloy by Laser-Based Powder Bed Fusion Process and It’s Mechanical Properties

Recently, high-entropy alloys have attracted much attention because of their superior properties such as high strength and corrosion resistance. In this study, the optimum fabrication of CoCrFeNiTiMo high-entropy alloy by laser-based powder bed fusion process was investigated. The process map for the effects of the laser power and scan speed on the surface roughness and density of the as-built specimens was constructed to optimize the process parameters of the parts. Also, the mechanical properties of the as-built specimens fabricated at the optimum process parameter derived from the process map were examined. Consequently, the optimum laser power and scan speed can be obtained using the process map for the effects of the laser power and scan speed on the surface roughness and density. The as-built specimen fabricated at the optimum fabrication condition showed a relative density of more than 99.7 %. The tensile strength and elongation of the as-built specimen were around 1150 MPa and more than 20%, respectively. The tensile properties of the as-built specimen obtained in this study are similar to those of the as-built specimen reported by other studies.