かたさ測定による金属の低温ぜい化の検出(ビッカースかたさと引張性質の温度依存性の相関性について)

概要

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The correlation of temperature dependence between Vickers hardness and tensile properties was examined in tungsten, molybdenum and steels (SS 41, Coltuf-28) in the range of 77°K to 773°K from the viewpoint of ductile-brittle transition property. As a result, it was found out that there was close correlation between the transition temperature due to the tensile properties and the junction point in the temperature dependence of Vickers hardness. The conclusion drawn from the comparison of the deformation found near tensile fracture surface with that found around Vickers impression. further leads to the idea that the junction points of higher and lower temperatures in the curves of the logarithmic hardness vs. the reciprocal absolute temperature express respectively their ductile-brittle transition points. It was also proved that the hardness test corresponds to the tensile test with larger strain rate, and using this relation it turned out that the difference between the transition temperature by hardness and that by tensile test could be illustrated.
社団法人日本材料学会の論文
1970-08-15