フェライト/パーライト鋼のナノ強度解析

概要

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Nanoidentation for three ferrite-pearlite steels, S25C, S35C and S45C, was conducted in order to examine tensile strength versus microstructural parameters and fatigue limit versus microstructural parameters. Nanoindentation on ferrite showed that converted Vickers hardness was kept constant independently of steels and indentation sizes, and almost equal to the base hardness of iron of 100. Nanoindentation on pearlite showed that converted Vickers hardness increased with indentation size and saturated at about 250. The saturated value was estimated as the inherent hardness of pearlite. Two equations of tensile strength versus microstructural parameters proposed by Pickering and others were consistent with nanoindentation results. Similar equation was obtained from nanoin-dentation result for each steels, using the law of mixtures. The equation of fatigue limit versus microstructural parameters proposed by Grozier and others was necessary to be modified on the basis of nanoindentation results. It was found from these results that nanoindentation was useful for the strength analysis of ferrite-pearlite steels in a nanoscopic scale.
一般社団法人日本機械学会の論文
2002-07-25