Thispaperdealswiththephasetransformationofaustenitetoferritewithinthecriticaltemperatureregion(betweenAc1andAc3).Theresultsshowthatthevolumefractionoftransformationofferriteformedisothermallyfromausteniteismainlyvariedwiththeaustenitizingtemperature.Thehighertheaustenitizingtemperature,themorevolumefractionoftheferriteformedisothermallyfromaustenite.Besides,thephasetransformationofaustenitetoferritewithinthecriticaltemperatureregionwascheckedbyaustenitizingisothermaltime.Thevolumefractionofferriteformedisothermallyfromaustenitewithinthecriticaltemperatureregionfordifferentisothermaltimehasheenexaminedexperimentally.Thelglg(l-fv)-1vslgtrelationdoesnotfollowtheAvramiequationstrictlyandconsistsoftwostraightlines.
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