Interplay between diffusive and displacive phase transformations: TTT diagrams and microstructures

Details Interplay between diffusive and displacive phase transformations: TTT diagrams and microstructures Interplay between diffusive and displacive phase transformations: TTT diagrams and microstructures

2006-05-23

arxiv.org/abs/cond-mat/0605577v1

Phys. Rev. Lett. 97, 055701 (2006)

Physics

Condensed Matter

Materials Science

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.97.055701

Materials which can undergo extremely fast displacive transformations as well as very slow diffusive transformations are studied using a Ginzburg-Landau framework to understand the physics behind microstructure formation and time-temperature-transformation (TTT) diagrams. This simple model captures the essential features of alloys such as steels and predicts the formation of mixed microstructures by an interplay between diffusive and displacive mechanisms. The intrinsic volume changes associated with the transformations stabilize mixed microstructures such as martensite-retained austenite (responsible for the existence of a martensite finish temperature) and martensite-pearlite. keywords: phase-field, spinodal decomposition, pearlite, martensite, steel, elastic compatibility

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