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Measurement of quench heat transfer coefficients and their use in heat treatment design Gupta, Shashi Mohan

Abstract

The heat-transfer phenomena in the quenching process have been studied using stainless steel and mild steel specimens in brine (3% by wt. NaCl), water, oil and air, under controlled conditions. The experimental data were analysed using a simple mathematical model of the quenching process to study the relationship between the surface temperature of the specimen and the surface heat-transfer coefficient. The influence on this relationship, of important variables such as initial specimen temperature, quenchant temperature, surface oxidation, etc. has been studied. The results from the experimental data are in good agreement with the results of previous workers. The results obtained in this work, together with Jominy-test data and the mathematical model, were used to determine the necessary quenching conditions required to obtain a desired thermal history or mechanical property at a given position in a 4 inch diameter steel grinding-ball. A steel ball was then quenched under the above determined conditions and an examination of the ball section showed that the desired property was indeed present at the given location.

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