The role of plastic strains on variant selection in ausformed bainitic microstructures studied by finite elements and crystal plasticity simulations
Adriana Eres-Castellanos (National Center for Metallurgical Research, Madrid)
Javier Hidalgo (TU Delft - Team Kevin Rossi)
Lucia Morales-Rivas (Technische Universität Kaiserslautern)
Francisca G. Caballero (National Center for Metallurgical Research, Madrid)
Carlos Garcia-Mateo (National Center for Metallurgical Research, Madrid)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
The mechanisms driving variant selection phenomena in ausformed bainitic microstructures are not fully controlled yet. Previous results are not congruent among them, as they cannot be explained by the same rule. In this work, we aimed to understand the mechanisms governing variant selection in a medium carbon-high silicon steel subjected to ausforming treatments. To do so, the microstructural characterization in different regions of barreled samples has been combined with the simulation of the stress and strain state at the macro and micro level, by finite elements simulations and crystal plasticity simulations, respectively. The main conclusion is that the variant selection shown in these microstructures can be explained by understanding the distribution of the plastic strains at the macro and micro level. The selection of crystallographic variants is more pronounced in the regions which have been more deformed. Also, the deformation distributes along deformation microbands, where the most promoted variants seem to grow, in good agreement with previous results in ausformed lath martensite.
help_outline