[T8] MIM - Stainless Steel and Heat Resistant Alloy

[15D-T8-08] Effect of Sintering Conditions on Microstructures and Mechanical Properties of Stellite6 Alloy Fabricated by MIM Process

*E. Endo¹, H. Nakayama¹, M. Sakamura² (1.Castem Co., Ltd., Japan, 2.Hiroshima Prefectural Technology Research Institute, Japan)

Keywords:metal injection molding, mechanical properties, Co-based alloys

Stellite is an alloy consisting mainly of Co with additions of Cr and W. It has excellent heat and wear resistance, but is generally finished by machining after casting because it is very difficult to machine. In this study, the effects of sintering conditions on the microstructure and mechanical properties of Stellite 6 alloy fabricated by metal injection molding process was investigated. The injection-molded compacts were sintered in vacuum at temperatures between 1225℃ and 1275℃ and holding times of 135minutes. The microstructure of the sintered alloys consisted of Co, Cr carbides, and Cr oxides. The tensile strength and elongation of the alloy were 1220MPa and 14% at a sintering temperature of 1250℃.