Abstract
The relationship between the size of material, fraction of martensite and austenite grain size is considered for a certain eutectoid steel under a certain cooling condition. It is assumed that the isothermal pearlite transformation can be expressed as X =1 -exp {-k(T) (tn/dm )} for the whole transformation temperature range and that the transformation is additive over the whole transformation range. The cooling rate is determined as a function of section size (which is commonly found in actual quenching). With the application of the obtained relation, the Jominy curve, DI vs DI,X (the diameter of the bar with X pct martensite at the center after an ideal quenching) and the effect of austenite grain size on the DI and Jominy distance are shown to be predictable.
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Umemoto, M., Komatsubara, N. & Tamura, I. Prediction of hardenability effects from isothermal transformation kinetics. J. Heat Treating 1, 57–64 (1980). https://doi.org/10.1007/BF02833039
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DOI: https://doi.org/10.1007/BF02833039