A multiscale perspective on the kinetics of solid state transformations with application to bainite formation
C. Hueter, M. Lin, D. Schicchi, M. Hunkel, U. Prahl, R. Spatschek,
Volume: 2 (4). Pages: 319--345
DOI: 10.3934/matersci.2015.4.319
Published: #sep# 2015
Abstract
We give an excerpt of recent developments in the experimentally benchmarked
modeling
of bainite formation in the press hardening process. As the press
hardening process poses a heavily
multi-parameter dependent modeling challenge, we focus on three main
branches which complement
each other. We emphasise the combination of basic sharp interface
and phase field models with pragmatically
adapted multi phase field models and experimentally parametrized implementations
of the
Johnson-Mehl-Avrami model. In the basic thermodynamic modeling part,
we review fundamental
aspects of displacive and diffusional-displacive transformations to
predict dominant transformation
morphologies. These results provide a link to multi-phase-field implementations
which allow to simulate
isothermal bainitic transformations, supported by available material
data from thermodynamic
databases. Excellent agreement with experiments, e.g. scanning electron
microscopy for the transformed
bainite in the high-carbon steel 100Cr6 shows the value of these model
implementations. The
further connection to Johnson-Mehl-Avrami models o ers to extend the
understanding to transformation
plasticity for the press hardening steel 22MnB5.