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Title:On the evolution of lattice deformation in austenitic stainless steels—The role of work hardening at finite strains
Authors:Dong-Feng Li , Noel P. O'Dowd,, 2011
Abstract: In this work, a three dimensional crystal plasticity-based finite element model is presented to examine the micromechanical behaviour of austenitic stainless steels. The model accounts for realistic polycrystal micromorphology, the kinematics of crystallographic slip, lattice rotation, slip interaction (latent hardening) and geometric distortion at finite deformation. We utilise the model to predict the microscopic lattice strain evolution of austenitic stainless steels during uniaxial tension at ambient temperature with validation through in situ neutron diffraction measurements. Overall, the predicted lattice strains are in very good agreement with those measured in both longitudinal and transverse directions (parallel and perpendicular to the tensile loading axis, respectively). The information provided by the model suggests that the observed nonlinear response in the transverse {200} grain family is associated with a competitive bimodal evolution of strain during inelastic deformation. The results associated with latent hardening effects at the microscale also indicate that in situ neutron diffraction measurements in conjunction with macroscopic uniaxial tensile data may be used to calibrate crystal plasticity models for the prediction of the inelastic material deformation response.
ICHEC Project:Microscale study of the deformation and failure behaviour of polycrystals at elevated temperature
Publication:Journal of the Mechanics and Physics of Solids Volume 59, Issue 12, December 2011, Pages 2421–2441
URL: http://dx.doi.org/10.1016/j.jmps.2011.09.008
Keywords: Finite elements; Crystal plasticity; Latent hardening; Neutron diffraction; Lattice strain
Status: Published

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