AbstractDThekinetictransitionbetweenpartitionedandunpartitionedgrowthof proeutectoidferritehas beenstudiedforhigh-purityFe±C±MnandFe±C±Nialloys,andfortemperaturesjust abovetheeutectoid. Theseresults(andcertainresultsofpreviousinvestigations)arecomparedwith computedparaequilibrium andequilibriumternaryphasediagrams,anditisshownthatthetransitionoccurswell withinthepara- equilibriumtwo-phaseregions,butsigni#174;cantlyoutsidethe