AbstractDThe kinetic transition between partitioned and unpartitioned growth of proeutectoid ferrite has been studied for high-purity Fe±C±Mn and Fe±C±Ni alloys, and for temperatures just above the eutectoid. These results (and certain results of previous investigations) are compared with computed paraequilibrium and equilibrium ternary phase diagrams, and it is shown that the transition occurs well within the para- equilibrium two-phase regions, but signi®cantly outside the
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