Prediction of the Martensite Start Temperature in High‐Carbon Steels
Jerome Ingber, Maik Kunert
Abstract
A new model for estimating the martensite start temperature ( M s ) as a function of chemical composition is presented. It is developed and optimized for high‐carbon steels with a M s range between 0 and 50 °C. It is based on the mean value of the best 8 of 21 considered models from the literature. A comprehensive evaluation is made by comparing the calculated M s with experimental M s data. Within the targeted M s range, the average absolute deviation of the calculated M s is as low as 13 °C. The investigations further show that the new model also makes accurate predictions outside the targeted M s range. The average absolute deviation in the M s range from 0 to 400 °C is found to be 21 °C, the lowest of all compared models. Furthermore, 75% of all calculations are within a deviation of 25 °C and 93% are within 50 °C. In general, the new model outperforms the models from which it is built.