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Abstract
Martensite reaction is a heterogeneous transformation. Frequently, it starts in a few austenite grains and proceeds by nucleation of additional martensite units in the partially transformed grains as well as in untransformed ones, thus spreading the transformation throughout. It is shown that concepts developed to describe 'spread' in athermal martensite can be extended to the isothermal transformation. The kinetics of 'spread' is described by an autocatalytic equation and the number of initially available nucleation sites is calculated and compared with available results. The 'spread' of the transformation and the growth of plates are closed related, entailing a grain size effect.
