Abstract
The rate of grain growth in the initial stages of isothermal austenitizing has been studied by a thermal etching method in plain, eutectoid, carbon steel in the range 840-970°c. An equation relating the mean initial and instantaneous grain diameters, D0 and D, to the austenitizing time t, of the form D2-D02=Kt exp (-H/kT) is developed on the assumption that the growth rate is controlled by interfacial tension at grain boundaries. An estimate of the constant K is made, and by the use of experimentally obtained values of D, D0 and t the value of H is calculated to be 30 kcal/g atom, close to the activation energy estimated for grain-boundary self-diffusion and to that determined for the damping of low amplitude torsional oscillations.
Published Version
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