動的ひずみ時効を考慮した改良9Cr-1Mo鋼の統一形非弾性構成式

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A unified constitutive model considering dynamic strain aging effect was developed in order to describe inelastic deformation behavior of the Modfied 9Cr-1Mo steel precisely. The inelastic behavior of the steel was summarized as follows. A rate dependent deformation was observed above 500℃, and there was no rate dependency under 400℃. However, stress relaxation behavior was observed even at rate independent temperature region. Further, a stress after relaxation depended on prior loading strain rate, and it showed a higher value as the strain rate was slow. A feature of the proposed constitutive model was that an applied stress consists of three stress components : a back stress, an overstress and an aging stress which corresponds to dynamic strain aging and shows a negative strain rate dependency. The aging stress was measured by strain rate change tests, and it showed larger values as the strain rates were slow and the temperatures were low. The backstress and the overstress were measured by strain dip tests. The backstress was approximately rate independent under 400℃, however it showed rate dependency above 500℃. The overstress showed larger values as the strain rates were fast and the temperatures were high. The material constants were determined systematically based on the measured values of each internal variable. In order to evaluate the validity of the constitutive model. numerical simulations were done for various inelastic deformation behavior of Mod. 9Cr-1Mo steel. The simulations agreed with experimental results very well in all cases.
1998-02-25

動的ひずみ時効を考慮した改良9Cr-1Mo鋼の統一形非弾性構成式

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