Abstract
Aspects of the mechanical behaviour of microalloyed steels characterised by grain refinement due to large plastic deformation are discussed. The studies presented in this chapter are intended to promote understanding of the mechanical behaviour of multiphase and ultrafine-grained materials related to the refinement of the microstructure, particularly taking into account the effects of microalloying. Several levels of grain refinement are identified with respect to changes in the strengthening mechanisms. Experimental results have been used to calibrate constitutive equations describing plastic flow mechanics. These equations have been modified and systematically ordered for ultrafine-grained microalloyed steels. Experimental results supported by multiscale numerical analyses have allowed the development of a rheological model for ultrafine-grained microalloyed steels.
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