Transformation strains for bainitic variant evolution in steel

In our work, we supplement a thermodynamically consistent multi‐scale model for the bainitic phase transformation in a low alloy steel, which takes into account the mechanisms of elasto‐viscoplasticity, phase transformations and heat conduction as well as the poly‐crystalline structure of steel. In order to obtain realistic simulation results, the microscopic conversion procedures for the austenite‐to‐bainite transformation have to be described in an appropriate way. To this end, the transformation strains for the crystallographic variants have been adjusted. For calculation of transformation strains a theory for the formation of dislocated martensite, more precisely a hierarchical packet‐block structure, is used. The calculated transformation strains are used in a simulation of bainite phase transformation in a polycrystalline RVE. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)