Heat Transfer Coefficients during Quenching of Steels
H. S. Hasan, M. Peet, J. M. Jalil and H. K. D. H. Bhadeshia
Heat and Mass Transfer, 47 (2011) 315-321.
DOI: 10.1007/s00231-010-0721-4
Abstract:
Heat transfer coefficients for quenching in water have been measured as a function of temperature using steel probes for a variety of iron alloys. The coefficients were derived from measured cooling curves combined with calculated heat-capacities. The resulting data were then used to calculate cooling curves using the finite volume method for a large steel sample and these curves have been demonstrated to be consistent with measured values for the large sample. Furthermore, by combining the estimated cooling curves with time-temperature-transformation (TTT) diagrams it has been possible to predict the variation of hardness as a function of distance via the quench factor analysis. The work should prove useful in the heat treatment of the steels studied, some of which are in the development stage.