Ni基一方向凝固合金の多軸クリープ : 第1報,実験および最小クリープ速度の解析

概要

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Combined tension-torsion creep tests of a Ni-base directionally solidified alloy are performed at 850℃ using thin-walled tubular specimens solidified directionally in the axial direction. It is observed that equivalent creep rate depends markedly on the ratio of shear stress to tensile stress under constant equivalent stress of the Mises-type, while noncoaxiality between stress and creep rape is relatively small. Minimum creep rates obtained in the experiments are examined in comparison with related analyses based on the crystallographic slip theory. It is shown that the minimum creep rates are simulated well if the {111}<112> octahedral system is combined with the {100}<110> cubic system. The former is active in tensile creep of the specimen, while the latter is in shear creep.
1990-11-25