Investigation on the Bonding Mechanism of M42 Powder High-Speed Steel and 45 Steel

Abstract

The sintering of M42 P/M high speed steel followed by jointing to 45 steel had been accomplished at one step by using spark plasma sintering (SPS) technique. Based on the traditional diffusion theory and the designed structure of M42/45 steel joint, the bonding mechanism and models with the interface forming process of the bimetal have been proposed systematcally. The jointing and valuation of M42/45 steel interface are a comprehensive synergy process between fusion and diffusion mechanism. The former one takes priority at the early sintering process, while the later one becomes dominant over the followed sintering process.