Estimation of Martensite Start Temperature

The knowledge of the martensite start temperature (Ms) is very important for the targeted heat treatment of steels.
Therefore, many models have been developed to predict Ms without having to perform time-consuming experiments.

On this page, some of the models for estimating Ms are summarized and used to calculate Ms on basis of the chemical composition of the steel. In addition to the models from literature, a new model ("Ingber") is used for estimation of Ms. This model has been developed for high-carbon steels whose Ms are in the range from 0 to 50°C. However, it is also suitable for low and medium carbon low alloy steels and most medium manganese steels.

An overview of the equations used for the calculation is compiled in a pdf file that can be downloaded here: Predicting the Ms - Overview of Equations.pdf

Please note that this collection is not complete.
It represents the equations known to us. If you know of other equations, we will be pleased to add them to this collection.

The calculation and further information are also available at GitHub.

We would also like to point out that there are other approaches to calculate Ms values:

• Martensite Start Temperature Predictor from Northwestern University: https://info.eecs.northwestern.edu/MsTpredictor
• STEEL_MS_EMPIRICAL_2014 from Mathew J. Peet at Materials Algorithms Project Program Library: https://www.phase-trans.msm.cam.ac.uk/map/steel/programs/ms-empirical2014.html