Crystal plasticity study on stress and strain partitioning in a measured {3D} dual phase steel microstructure
M. Diehl, D. An, P. Shanthraj, S. Zaefferer, F. Roters, D. Raabe,
Volume: 20(3). Pages: 311--323
DOI: 10.1134/S1029959917030079
Published: 2017
Abstract
Dual phase steels are advanced high strength alloys typically used
for structural parts and reinforcements in car bodies. Their good
combination of strength and ductility and their lean composition
render them an economically competitive option for realizing multiple
lightweight design options in automotive engineering. The mechanical
response of dual phase steels is the result of the strain and stress
partitioning among the ferritic and martensitic phases and the individual
crystallographic grains and subgrains of these phases. Therefore,
understanding how these microstructural features influence the global
and local mechanical properties is of utmost importance for the design
of improved dual phase steel grades. While multiple corresponding
simulation studies have been dedicated to the investigation of dual
phase steel micromechanics, numerical tools and experiment techniques
for characterizing and simulating real 3D microstructures of such
complex materials have been emerged only recently. Here we present
a crystal plasticity simulation study based on a 3D dual phase microstructure
which is obtained by EBSD tomography, also referred to as 3D EBSD
(EBSD—electron backscatter diffraction). In the present case we utilized
a 3D EBSD serial sectioning approach based on mechanical polishing.
Moreover, sections of the 3D microstructure are used as 2D models
to study the effect of this simplification on the stress and strain
distribution. The simulations are conducted using a phenomenological
crystal plasticity model and a spectral method approach implemented
in the Düsseldorf Advanced Material Simulation Kit (DAMASK).