A phenomenological model is presented which is capable of estimating not only the overall stresses and strains resulting when steels are quenched, but also the mean stresses in each metallurgical phase. It is postulated that the mean strain rates of all phases are equal when reduced by a term proportional to the rates of volume fractions. Some simplifications following from the fact that specific heats at constant volume of all metallic structures are sensibly constant above room temperature are also discussed.
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