押込みかたさとバウシンガー効果(第1報)

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The indentation hardness of 0.57% carbon steel specimens, which were applied 5.6% and 10.7% tensile or compressive prestrains, was measured by a 10mm diameter quenched steel ball, and the following results were obtained :　(1) Owing to the Bauschinger Effect, the hardness of the specimens applied tensile strain was smaller than that of the specimens applied the same amount of compressive prestrain as the tensile strain. By low temperature ageing, the hardnes of these specimens increased, but the hardness of the tensile prestrained specimens was still smaller than that of the compressive prestrained ones. It is clear that low temperatme ageing can not remove the Bauschinger Effect completely.　(2) To make the series of p_m / c - 20 (d / D) curves obtained from the hardness measurements of tensile prestrained specimens coincide with the true compressive stress strain curves of the specimens, as D. Tabor suggests, the constant‘c' must be set about 3.15 to 3.20, larger than 2.8, given by Tabor; where p_m represents mean indentation pressure of the steel ball with diameter D ; d the diameter of indentation It can be considered that this may be caused by the isotropy of the Bauschinger Effect. In consequence of the low temperature ageing of these specimens, the value‘c' comes near to 2.8, because the Bauschinger Effect is partly removed.　(3) The Meyer index‘n' for indentation hardness measurements of tensile prestrained specimens is larger than that of compressive prestrained ones, and comes near to 2.5, whlie the value‘n' approaches 2.0 when the specimens are aged. These phenomena can be said to have resulted from the Bauschlnger Effect.
1966-01-14

押込みかたさとバウシンガー効果(第1報)

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