A study of through-thickness texture gradients in rolled sheets |
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Authors: | O Engler C N Tomé M -Y Huh |
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Affiliation: | (1) the Materials Science and Technology Division (MST-8), Los Alamos National Laboratory, 87545 Los Alamos, NM, U.S.A.;(2) the Division of Materials Science and Engineering, Korea University, 136-701 Seoul, Korea |
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Abstract: | A method to simulate shear effects and through-thickness texture gradients in rolled sheet materials is introduced. The strain
history during a rolling pass is idealized by superimposing a sine-shaped evolution of the
13 shear component to a plane-strain state. These generic strain histories are enforced in a visco-plastic self-consistent (VPSC)
polycrystal deformation model to simulate texture evolution as a function of through-thickness position. The VPSC scheme is
deemed superior to a full constraints (FC) or relaxed constraints (RC) approach, because it allows one to fully prescribe
diagonal and shear-strain-rate components while still accounting for grain-shape effects. The idealized strain states are
validated by comparison with deformation histories obtained through finite-element method (FEM) calculations. The through-thickness
texture gradients are accounted for by introducing a relative variation of the sine-shaped
13 shear with respect to the plane-strain component. The simulation results are validated, in turn, by comparison with typical
examples of through-thickness texture gradients observed experimentally in rolled plates and in sheets of fcc and bcc materials. |
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