**5. Conclusions**

A computational model which can be used to analyze the onset of phase transformation for different steel compositions following different thermomechanical treatments prior to cooling was presented. The model can calculate the transformation start temperature for an arbitrary cooling path, and it can be used to analyze the effects of different alloying elements and mechanical straining on the transformation start at different temperatures. The calculation of transformation start for an arbitrary cooling path is of practical importance as it can be used in the design of cooling schedules. The estimate for the extent to which different alloying elements affect the phase transformation onset gives some indications of the underlying processes. These indications can be helpful in the construction of more detailed microstructure models, especially in finding ranges for different parameters in such models. Our computational method can be easily parameterized using constant cooling rate CCT data. When more detailed data is needed, for example, to consider the effect of different mechanical treatments prior to cooling, the method presented in this article can also be used.

**Author Contributions:** Methodology and Software A.P.; Writing—Original Draft Preparation, A.P.; Writing—Review & Editing, M.S., D.P.; Project Administration and Funding Acquisition, D.P.

**Funding:** This research was funded by TEKES through Finnish Metals and Engineering Competence Cluster (FIMECC) System Integrated Metals Processing (SIMP) Showcase 2.2 program as well as Digital Internet Materials & Engineering Co-Creation (DIMECC) Flex project.

**Conflicts of Interest:** The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.
