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Hao Wang,Dianwu Zhou,Youruiling Yan,Jinshui Liu,Bo Gao 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
Zirconium alloy is extensively used in nuclear industries as cladding and core structural material. However, the formabilityand service behavior are affected due to the anisotropy of mechanical property, which is detrimental to the specific application. In this work, effect of pre-straining and subsequent annealing (PA) on microstructure and mechanical property ofZr–Sn–Nb–Fe zirconium alloy is determined by means of scanning electron microscope equipped with electron backscattersdiffraction and digital image correlation technique. It is found that the basal texture intensity and grain size of as-receivedsample decreases after pre-straining, the work-hardening value (n) increases from 0.126 of as-received sample to 0.152 ofPA samples, while the anisotropy of mechanical property decreases gradually with the increase of pre-straining level. Inaddition, the strength, ductility and work-hardening value (n) of the PA samples tend to be accordant in the transverse direction,rolling direction (RD) and the 45° direction when the pre-straining level reaches 8%. The basal texture is graduallyweakened and dispersed along the RD after annealing, whose orientation is favorable for the activation of pyramidal ⟨c + a⟩slip to accommodate to the strain in thickness direction, which leads to the lower anisotropy (featured by the r-value). Thelow r-value and high work-hardening value (n) are favorable for improving formability. Hence, microstructure and textureof zirconium alloy can be modified though appropriate PA process to improve the comprehensive properties.