AheattreatmentforferrousalloysinwhichapartisquenchedfromtheaustenitizingtemperatureataratefastenoughtoavoidformationofferriteorpearliteandthenheldatatemperaturejustaboveMs,themartensitestarttemperature,untiltransformationtobainiteiscomplete.Althoughdesignatedasbainiteinbothaustemperedsteelandaustemperedductileiron(ADI),austemperedsteelconsistsoftwo-phasemixturescontainingferriteandcarbide,whileaustemperedductileironconsistsoftwo-phasemixturescontainingferriteandaustenite.