Effects of different powders on the properties of heat-resistant alloys prepared by metal injection molding

The paper investigated the effects of different powders on the properties of heat-resistant alloys prepared by metal injection molding (MIM), which include sintered density, microstructure, mechanical properties and corrosion resistance. The properties of heat-resistant alloys made of element mixed powders with iron carbonyl powder and gas-atomized powders were tested. The results show that both the mechanical properties and corrosion resistance of the former are superior to those of the latter. For the best sintered samples made of element mixed powders, the relative density, tensile strength and corrosion loss weight rate are 98.1%, 510 MPa and 1.3 mg·cm^-2, respectively. There are no obvious differences in their microstructures, which are composed of Fe-Cr ferrite a phase.