Investigation of Process Parameters to Fabricate Refractory Medium-Entropy Alloy by Selective Laser Melting Process

摘要

This thesis proposal investigates the synthesis of TiWMo refractory medium entropy alloy (RMEA) by selective laser melting process from elemental powder. Steel, titanium and tungsten substrates were used to study the impact on the formation of TiWMo RMEA. Different process parameters were applied to investigate the effects on melting, diffusion and formation of RMEA. The microstructure of TiWMo and elemental distribution were observed by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). SEM analysis revealed that with higher energy density the pores and microcracks were improved. EDS data validated the composition is homogenized and stable after few layers of deposition. Single phase BCC solid solution was predicted based on the theoretical calculation. The maximum microhardness 644 HV achieved from the highest 350 J/mm3 energy density.