Phase transformations and heredity in iron-carbon alloys
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Any phase transformation in steel is accomplished as a result of forming nuclei of a new phase by shear rebuilding of the lattice which is either accompanied by diffusion of carbon and alloying elements, or not. The difference in morphology and kinetics of martensitic and ‘normal’ transformations is connected with relaxation processes at an interphase boundary.
A consequence of the shear nature of transformation is the effect of heredity with α→γ-transformation (restoration of grain size, strengthening heredity). The completeness of realizing this effect depends on the degree of dislocation substructure stability.
With PTMT the stability of the dislocations structure of α-phase may be corrected by selecting the optimum original steel structure, the method and degree of deformation, and the post-deformation tempering regime.
KeywordsGrain Size Phase Transformation Relaxation Process Steel Structure Alloy Element
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