Lattice orientation dependence of the stored energy during cold-rolling of polycrystalline steels

• Published in: Acta materialia 2001-11, Vol.49 (19), p.4079-4088
• Main Authors: Diligent, S., Gautier, E., Lemoine, X., Berveiller, M.
• Format: Article
• Language: English
• Subjects: Applied sciences; Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Metals. Metallurgy; Physics; Recrystallization & recovery; Steels; Stored energy; Treatment of materials and its effects on microstructure and properties
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/S1359-6454(01)00270-1

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} to {111} 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.