Journal
ACTA MATERIALIA
Volume 61, Issue 14, Pages 5247-5262Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.05.017
Keywords
TWIP steel; Neutron diffraction; Lattice strain; Bauschinger effect; EPSC
Funding
- Commonwealth of Australia under the International Science Linkages program
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [FWP 06SCPE401, W-7405-ENG-36]
- Office of Basic Energy Sciences (DOE), USA
- Engineering Materials Institute, UOW, Australia
- Los Alamos National Security LLC under US DOE [DE AC52 06NA25396]
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The evolution of lattice strains in fully annealed Fe-24Mn-3Al-2Si-1Ni-0.06C twinning-induced plasticity (TWIP) steel is investigated via in situ neutron diffraction during cyclic (tension compression) loading between strain limits of +/- 1%. The pronounced Bauschinger effect observed upon load reversal is accounted for by a combination of the intergranular residual stresses and the intragranular sources of back stress, such as dislocation pile-ups at the intersection of stacking faults. The recently modified elasto-plastic self-consistent (EPSC) model which empirically accounts for both intergranular and intragranular back stresses has been successfully used to simulate the macroscopic stress-strain response and the evolution of the lattice strains. The EPSC model captures the experimentally observed tension-compression asymmetry as it accounts for the directionality of twinning as well as Schmid factor considerations. For the strain limits used in this study, the EPSC model also predicts that the lower flow stress on reverse shear loading reported in earlier Bauschinger-type experiments on TWIP steel is a geometrical or loading path effect. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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