非調質高張力鋼の強度靱性と集合組織

概要

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Fairly strong textures were found to be present in experimentally controlled rolled high tensile strength steels. The effect of such textures on the anisotropies of strength and toughness of these steels was quantitatively investigated. It was noted that the effect of textures on the anisotropies of yield stress and tensile strength could be accurately evaluated with Hosford and Backofen's method, if fine details of textures were properly taken into account by adopting the method of crystallite orientation distribution analysis developed by Roe. The anisotropy of toughness, on the other hand, was found to be qualitatively related to the distribution of {100} cleavage plane. Among the main components of the texture, which is present in those controlled rolled high tensile strength steels, {311}<011> orientations not only enhance the difference in strength between 0° (RD) and 90°(TD) direction, but also reduce the toughness at 45° direction, whereas {332}<113> orientations proved to be favourable to both strength and toughness, showing weak anisotropy. Thus, further improvement in strength and toughness might be possible, if {332}<113> orientations could be developed more preferentially.
1975-05-01