Abstract
The effect of sintering conditions on the mechanical properties of martensitic stainless steel fabricated by MIM was investigated. The specimens were made by injecting the mixture of gas atomized powder and a polyamide binder into a metallic mold. The compacts were debound in air at a temperature 593 K for 7.2 ks. They were sintered in vacuum between 1273 K and 1623 K for 7.2 ks. The density of the sintered compact increased with elevating sintered temperature. The density of the sintered compact of 5 μm powder was higher than that of the sintered compact of 10 μm powder. The grain size of the sintered compact of 5 μm powder scarcely changed with an increase in the sintering temperature, while that of the sintered compact of 10p.m powder became larger. The tensile strength of the sintered compact depended on the change in density of the sintered compact. The tensile strength of the sintered compact of 5 μm powder was around 1600 MPa.
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