Study of Heat Transfer Phenomena in Quenching of Steel : 2nd Report. an Analysis of Cooling Curves Accompanied with Phase Transformation

Abstract

The numerical analysis of unsteady heat conduction during quenching using the apparent heat capacity is taken up in this study. The temperature and the latent heat of phase transformation depend on the instantaneous cooling rate at point A₁ (727°C). The cooling curves accompanying the phase transformation were calculated using an iterative technique of implicit finite difference. These were calculated for two boundary condition cases : (1) the measured temperature of any radius (R1∼R3), and (2) the boiling curve. Agreement between the experimental and calculated results of case (1) is obtained. It was verified that the latent heat obtained by the previous work is useful for the numerical analysis of the quenching. The calculated cooking curves for case (2) agreed well with the experimental results.