where T1 and T2 are temperatures at the measuring points P1and P2
(shown in Fig. 1) of the sample respectively; the quenched surface, P1 and P2 are equidistant
and equal to Dx; Dt is the time interval from ‘n’ to ‘n + 1’, C is the specific heat capacity,
q is the density, k
is the heat conductivity factor, and Tw is the temperature of the quenching media. It is
clear that if the cooling curves of P1 and P2 during the quenching process have been
measured, the cooling curve of the quenched surface can be calculated by Eq. (1), and then
the heat transfer coefficient can be obtained from Eq. (2).