Nanoscopic Strength Analysis of Tempered-Martensitic Steels.

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  • 焼戻しマルテンサイト鋼のナノ領域強度解析
  • ヤキモドシ マルテンサイト コウ ノ ナノ リョウイキ キョウド カイセキ

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The relationships between tensile strength and microstructural parameters and between fatigue limit and microstructural parameters were investigated for seven tempered-martensitic steels S45C, SMn443, SCr440, SNCM439, SCM440, SUP7 and SUP12. An optical and atomic force microscopy showed that prior-austenitic grain diameter, dγ, block width, Wblo, and precipitation spacing, λ, were 18μm, 0.7μm and 0.11∼0.24μm, respectively, as microstructural parameters. A nanoindentation showed that HV=100+Hv*dls+Hv*pre+Hv*bou, where Hv is macro-Vickers hardness, and Hv*pre and Hv*bou are micro-covered Vickers hardness due to dislocation and solid, precipitation and block boundary strengthening. Hv*pre and Hv*bou were expressed by the microstructural parameters of λ and Wblo. The constant value of 100 is base hardness of the iron. Based on these results, we proposed that tensile strength σB and fatigue limit σw, were expressed in the followings. σB=3.27{100 + Hv*dls + 1.02 × 10-2λ-1 + 3.67 × 10-4λ-1w-1/2blo}…………………………………(A-1) σw=1 .6{100 + Hv*dls + 1.02 × 10-2λ-1 + 1.15(3.67 × 10-4λ-1w-1/2blo)}…………………………(A-2)

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