Lattice orientation dependence of the stored energy during cold-rolling of polycrystalline steels |
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Affiliation: | 1. Department of Metallurgical Engineering and Materials Science, IIT Bombay, Mumbai 400076, India;2. Tata Steel Research and Development, Jamshedpur, India;3. Center for Research in Nanotechnology & Science, IIT Bombay, Mumbai 400076, India;4. Department of Mechanical Engineering Department, Brigham Young Department, Utah 84602, USA;5. Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA |
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Abstract: | During cold deformation, about 10% of the energy spent is stored in the polycrystalline material in the form of the elastic energy associated to crystal defects. The latter can be measured experimentally by calorimetry, X-ray diffraction. In this work, we propose a direct calculation based on an elastic-plastic self-consistent model. The part of the stored energy related to second order (intergranular) stresses is estimated for a cold-rolled Ti–IF steel. The stored energy as well as the accumulated plastic strain are reported as a function of the final crystallographic orientation of the grains. Along the α-fiber, the stored energy increases from {001}<110> to {111}<110> while the plastic strain decreases. This dependence with the crystallographic orientation is in good agreement with experimental results. With respect to recrystallization, experiments show that {111}-grains nucleate first. This highlights the specific role of second order (intergranular) stresses for recrystallization. |
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