Recently, a new generation of high strength steels was introduced by using a lateral chemical pattern of an austenite stabilizer before quenching from partially homogenized austenite to succeed with fine-scaled microstructures of austenite and martensite. A pearlitic microstructure of ternary Fe-Mn-C is a suitable initial state for this when Mn effectively partitions into the cementite. The Matlab script published here provides an implementation of theoretical considerations on partitioning, negligible-partitioning as well as activity-based local equilibrium conditions based on thermodynamic data. With respect to the description of the physical fundamentals of this code incl. the relevant liteature sources, the users should consult the manuscripts linked to this dataset.

The software dataset contains the following parts: (1) code.m is the Matlab script tested under Matlab R2022a (2) The required data to run the script are alpha_gamma_600C.dat gamma_theta_600C.dat alpha_theta_600C.dat activity_600C.dat These files contain tie line data for the temperature under consideration, 600 °C in the example. Three different two-phase equilibria are required, each between alpha-(Fe,Mn,C), gamma-(Fe,Mn,C) and theta-(Fe,Mn)3C. The file “activity_600C.dat” contains grid data on the activity within gamma-(Fe,Mn,C). The data might be replaced by output from thermodynamic software. The read in is optimized for output files from Pandat.