A combined finite element – phase field model approach on the bainitic transformation
D. S. Schicchi, M. Lin, U. Prahl, M. Hunkel,
Volume: Conference Paper. Pages: on CD
Published: 2016
Abstract
Tailored tempering allows creating work pieces which differ locally
in properties in order to combine regions with high strength with
others of high ductility. In this process martensitic and bainitic
microstructures can be obtained. The latter offers higher ductility
zones and is the main focus of this study. The simulation of this
manufacturing process requires a model for the bainitic transformation,
such as the Johnson-Mehl-Avrami one, where its fitting parameters
are commonly experimentally obtained. On the other hand, the phase
field method is a powerful numerical tool able to describe the most
relevant metal-physical mechanisms during, e.g., phase transformations
such as the aforementioned. It is the goal of this article, to establish
a link between the mesoscopic scale accounted through the phase field
method and the macroscopic behavior of the bainitic transformation.
A dilatometer test is used in this first attempt as base for comparison
for the numerical results, where a coupling between finite element
and phase field methods is proposed.