鋼焼入れの伝熱現象の研究 : 第3報,焼入れの際の冷却曲線と過渡沸騰熱伝達

概要

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Unsteady heat conduction and transient boiling heat transfer problems during quenching are studied experimentally and numerically. The cooling curves of Au cylinder under various subcooled conditions of water are measured and the transient boiling heat transfer are calculated using those results. The experimental cooling curves for different diameters of steel were measured using the CA sheathed thermocouple when the initial temperature of the specimen is 850℃ and the water is 20℃. The cooling curves during quenching were calculated using an implicit finite difference method. The characteristics of transient boiling heat transfer of Au specimen in the case of liquid subcooling 0K to 80K become clear. In the case of measured and referenced boiling curves as the boundary condition, the calculated cooling curves of cylindrical core of steel were not in agreement with the experimental results. However, we derived suggentions from those examinations that the effect of diameter on the boiling heat transfer is very important. The model included the effect of diameter on the measured boiling curve. The calculated cooling curves using the model of boiling curve as the boundary condition agreed well with the experimental results using steel.
1988-12-25