Study of Heat Transfer Phenomena in Quenching of Steel (An Analysis of Cooling Curves Accompanied wth Phase Transformation)

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The numerical analysis of unsteady heat conduction during quenching using the apparent heat capacity were investigated in this study. The temperature and the latent heat of phase transformation depend on the instantaneous cooling rate at the 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 (R 1∼R 3), and (2) the boiling curve. Agreement between the experimental and calculated results of case (1) was found. It was verified that the latent heat obtained by the previous study is useful for the numerical analysis of quenching. The calculated cooling curves for case (2) agreed well with the experimental results.

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