Using a data acquisition system it was possible to collect the
monitored temperatures by thermocouples at each time during
the cooling of the specimen. To calculate the cooling rates, it was
used the following methodology: estimating the interval between
the austenitizing temperature ðTaustÞ and the starting temperature of martensitic transformation ðMsÞ. This ðDTÞ is divided by a time
interval ðDtÞ where the cooling rate is maximum. Eq. (2) shows
the calculation of the cooling rate ðT o
Þ in ðC=sÞ:
T o
¼
DT
Dt ¼
ðTaust MsÞ
Dt ð2Þ