鉄系工具材料の材料特性に及ぼす混合条件の影響

概要

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Powder Metallurgical HIP’ed（P/M HIP’ed）high speed tool steels have better mechanical properties but lower notched ductility than those of conventional tool steels due to uniformly distributed fine carbides. Therefore it is thought to be a useful means to add properly larger carbides to high speed steel powder. This paper describes the mechanical test results of WC carbide added tool steels prepared with wet type ball mill and dry type V mixer. 9.3 and 17 volume % of WC added high speed steels were investigated in terms of bend test, hardness test, fractal dimension, carbide distribution and so on in comparison with conventional and commercial P/M HIP’ed high speed steels. As a result it was found that lower bend strength, lower hardness and lower fractal dimension for 9.3 and 17 volume % WC steels were obtained than for conventional and P/M HIP’ed steels due to agglomerated carbides.
2010-06-30