Study of internal lattice strain distributions in stainless steel using a full-field elasto-viscoplastic formulation based on fast Fourier transforms

In this work, the evolution of internal lattice strains in face-centered cubic stainless steel under uniaxial tension is studied using a recently developed full-field elasto-viscoplastic formulation based on fast Fourier transforms. The shape of the diffraction peaks is simulated, and the predicted...

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Bibliographic Details
Published inActa materialia Vol. 60; no. 6-7; pp. 3094 - 3106
Main Authors Kanjarla, A.K., Lebensohn, R.A., Balogh, L., Tomé, C.N.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.04.2012
Elsevier
Subjects
Applied sciences
Exact sciences and technology
Lattice strains
Metals. Metallurgy
Neutron diffraction
Peak broadening
Stainless steel
Yield phenomena
Peak broadening
Lattice strains
Neutron diffraction
Yield phenomena
Stainless steel
Fourier transformation
Viscoplasticity
Strain distribution
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Summary:In this work, the evolution of internal lattice strains in face-centered cubic stainless steel under uniaxial tension is studied using a recently developed full-field elasto-viscoplastic formulation based on fast Fourier transforms. The shape of the diffraction peaks is simulated, and the predicted lattice strains (peak shift and broadening) are compared with the experimental measurements obtained by in situ tensile neutron diffraction. Detailed analysis of the lattice strain distributions reveal that {100} and {110} transverse families exhibit a bimodal nature, and that transverse lattice strains are more sensitive to local grain interactions compared with longitudinal lattice strains. A comparison with the results of a mean-field formulation indicates that type III (intragranular) stresses play a much larger role than type II (intergranular) stresses in diffraction peak broadening.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2012.02.014