不同类型粉末对金属注射成形耐热合金性能的影响

研究了不同类型耐热合金粉末对金属注射成形(metal injection molding,MIM)烧结样品的致密度、金相组织、力学性能及耐蚀性能的影响.结果表明:只要工艺控制得当,以羰基铁粉为主体的元素混合粉制备的MIM耐热合金的力学性能和耐蚀性能均优于气雾化预合金粉;前者的致密度、抗拉强度及饱和失重率分别达到98.1%、510 MPa及1.3 mg·cm^-2;而两者的显微组织均为Fe-Cr铁素体α相,并未呈现显著的差异.

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.