Study of Heat Transfer Phenomena in Quenching of Steel : Effects of Boiling Heat Transfer on Cooling Curves and Water Temperature on Hardness of Steel
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概要
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Unsteady heat conduction and transient boiling heat transfer problems during quenching are studied experimentally and numerically. The relation between the hardness of S 45 C steel and the temperature of cooling water is also examined experimentally. The cooling curves of a gold cylinder under various subcooled conditions of water are measured and the transient boiling heat transfer is calculated using those results. The experimental cooling curves for different diameters of steel were measured using the CA sheathed thermocouple. The cooling curves during quenching were calculated using an implicit finite difference method. The characteristics of transient boiling heat transfer of a gold specimen to liquid subcooling from 0 to 80 K became clear. A model including the effect of curvature on the measured boiling curve was constructed. The calculated cooling curves using the boiling curve model as the boundary condition agreed well with the experimental results of steel. High cross-sectional and surface hardness are obtained below 40℃.
- 1990-05-15
著者
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Katayama Kozo
Faculty Of Engineering Shibaura Institute Of Technology
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Maki Tadasu
Faculty Of Engineering Kanagawa University
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Tajima Mamoru
Faculty Of Engineering Kanagawa University
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