高速度工具鋼粉を用いた炭化物・硼化物共分散硬質P/M合金の焼結および熱処理特性

概要

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The sintering phenomena of mixtures of high speed steel powder and boron containing ferrous alloy powders were studied to obtain carbides and borides precipitated wear resisting P/M alloys. Moreover, the properties of these alloys after heat treatment were also examined. AISI M7 and carbon reduced M7 (0.5%C) powders were selected, and Fe-B and Fe-Cr-B powders were used as additive powder.<BR>The results obtained were summarized as follows:<BR>(1) Fe-B alloy powder was better than Fe-Cr-B powder as the boron containing additive powder.<BR>(2) In order to get good mechanical properties, boron content of mixture was to be determined as (Mo at% +W at%)/B at%=1.0.<BR>(3) Carbon content of H.S.S. should be reduced from standard value to make carbides and borides coprecipitate.