J. Phys. IV France 112 (2003) 139
The kinetics of lath martensitic transformationG. Ghosh and G.B. Olson
Department of Materials Science and Engineering, Robert R. McCormick School of Engineering and Applied Science, Northwestem University, 2225 N. Campus Drive, Evanston, IL 60208-3108, U.S.A.
The multicomponent solution thermodynamics, a model for barrierless heterogeneous martensitic nucleation, a model for the composition and temperature dependence of the shear modulus, and a set of unique interfacial kinetic parameters are integrated to model the kinetics of lath martensitic transformation. It is shown that in multicomponent alloys can be predicted within 40K. The geometrie partitioning of austenite grain and the dependence of average lath volume on the fraction transformed is established by a careful analysis of lath microstructure. The main contribution of lath martensitic transformation is due to autocatalytically generated defects.
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