Abstract
ABSTRACTThe effects of chromium carbide on the microstructures and wear resistance of high speed steel were studied. Metal matrix composites (MMCs), based on M2 high speed steel reinforced with different percentages of Cr3C2, were produced following a metal injection moulding route: feedstock manufacturing, injection, debinding and sintering. The weight fraction of hard second phase particles in tool steels is limited by the formation of large interconnected carbides that embrittle the alloy. Additions of up to 14 wt-% Cr3C2 were successfully prepared. The influence of the chromium carbide content on the optimum sintering temperature was analysed. The mechanical properties of the sintered composites were obtained by measuring hardness and wear behaviour. Microstructure and wear mechanisms were investigated by means of scanning electron microscopic observations. These results, together with X-ray diffraction characterisation and EDS analysis, allow explanation of the mechanisms responsible for the wear behaviour.This paper is part of a special issue on the Advances in Materials and Processing Technologies (AMPT) 2015 and has subsequently been revised and extended before publication in Powder Metallurgy.
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