| Plastic deformation behavior in two representative two-phase alloys, i.e., a spheroidized high-carbon steel and a (alpha)-(gamma) duplex stainless steel, was studied by taking into account the mutual interactions between constituent phases. It was attempted to evaluate the partition of the in-situ stress and the in-situ strain in each constituent separately. Microstrain measurements in ferrite and austenite were performed by means of microgrids in the case of the (alpha)-(gamma) duplex stainless steel. The plastic strain of ferrite calculated from the alloy strain by the modified law of mixtures was used for the spheroidized high-carbon steel. In both cases, the back stress was estimated in a Bauschinger test. The in-situ stresses in the constituent phases were calculated on the basis of the dislocation-continuum strain-hardening theory. The modified laws of mixtures were applied to obtain the flow stress and flow strain of the alloys. The modified laws of mixtures were derived on the basis of stereological analysis. |
