Abstract
A simple model is proposed for predicting the plastic deformation of two-phase materials, taking into consideration the difference between the anisotropies of the constituent phases. It is shown that, for a state of uniaxial stress in the two-phase material, the difference between the anisotropies of the phases present gives rise to a biaxial stress state in each phase. Hill's criterion of plastic orthotropy is used to characterize the anisotropy of the constituent phases whose work-hardening properties are known. The theoretical simulations of stress-strain curves and of the variations in plastic strain ratio r compare reasonably well with the experimental results for duplex-phase FeNiCr steels composed of fine grains of austenite and ferrite.
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