Abstract
Internal stresses due to anisotropic thermal and plastic properties were investigated in a rolled Zirconium-α. The thermal stresses induced by a cooling process were predicted using a self-consistent model and compared with experimental results obtained by X-ray diffraction. The study of the elastoplastic response during uniaxial loading was performed along the rolling and the transverse direction of the sheet, considering the influence of the texture and the thermal stresses on the mechanical behaviour. We used an elastoplastic self-consistent formulation and the predicted results are compared with mechanical tests. The role of twinning and slip on the development of internal stresses is also discussed.
Highlights
Zirconium alloys are widely used in the nuclear industry because they exhibit high resistance to corrosion, good thermal conductivity and a low neutron cross section
The residual stresses due to thermal anisotropy are rather important and they play an important role on the elastoplastic transition
The stress-free lattice parameters of our sample were determined with the model and we found a ϭ 3.2365 Aand c ϭ 5.1498 A
Summary
Zirconium alloys are widely used in the nuclear industry because they exhibit high resistance to corrosion, good thermal conductivity and a low neutron cross section. They have a hexagonal close packed structure at room temperature. These alloys present anisotropic thermal, elastic and plastic properties at mesoscopic (grain) and macroscopic levels. These properties and the crystallographic texture explain the appearance and the development of internal stresses when an elastoplastic deformation is introduced. —Thermal internal stresses, which may arise from thermal anisotropy. Elastic strain (and this stress) must be present to maintain the compatibility of total strain between adjacent grains —Mechanical internal stresses, induced by the elastoplastic anisotropy and the requirement of compatibility
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