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

Abstract

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

4 pages, 5 figures

References in corpus (3)

• Theory of Phase Ordering Kinetics
• Elastic Deformation of Polycrystals
• Two Modes of Solid State Nucleation - Ferrites, Martensites and Isothermal Transformation Curves

Cited by in corpus (7)

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• Towards the ab initio based theory of the phase transformations in iron and steel
• Role of magnetic degrees of freedom in a scenario of phase transformations in steel
• Effect of lattice mismatch-induced strains on coupled diffusive and displacive phase transformations
• Effect of magnetism on kinetics of "gamma"-"alpha" transformation and pattern formation in iron
• Phase field simulations of coupled phase transformations in ferroelastic-ferroelastic nanocomposites
• Phase field model for coupled displacive and diffusive microstructural processes under thermal loading