Hydride Behavior in Zircaloy‐4 during Thermomechanical Cycling

Colas, Kimberly; Motta, Arthur T.; Daymond, Mark R.; Almer, Jonathan; Cai, Zhonghou

doi:10.1002/9781118456835.ch72

Cited by 1 publication

(2 citation statements)

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“…After the thermomechanical treatment, the hydride microstructures were characterized using light microscopy of either the normal plane, i.e., the flat sheet surface or through-thickness plane (normal to RD). For micrographs of the through-thickness plane, the degree of hydride reorientation was characterized using the radial hydride fraction (RHF), which was determined based on the examination of a 600 by 200-lm 2 rectangular region of the micrographs within which the ratio of total length of radially oriented hydrides to total length of all hydrides [31,42] was estimated as follows:…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Those results raise the question of whether there is also a significant effect of the stress state on the hydride structural response, as measured by the change in hydride lattice spacing, during dissolution/ precipitation of both in-and out-of-plane hydrides in Zircaloy-4 during thermomechanical treatment. Synchorotron X-ray diffraction can be a useful technique for this purpose [22,39,[41][42][43][44].…”

Section: Hydride Dissolution/precipitation Behavior and Stress Statementioning

confidence: 99%

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Hydride Reorientation in Zircaloy-4 under Different States of Stress as Studied with In Situ X-Ray Diffraction

Cinbiz

Motta

Koss

et al. 2018

Zirconium in the Nuclear Industry: 18th International Symposium

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Hydride reorientation can occur as a result of vacuum drying or transportation of spent nuclear fuel rods prior to dry cask storage. The elevated temperatures generate high internal gas pressure in the fuel rods, causing d-hydride platelets to precipitate perpendicular to the hoop stress during cooling. Because the loading causes multiaxial stresses, it is of interest to elucidate the role of stress state on the threshold stress for hydride reorientation. To that end, specially designed specimens were used with a range of stress biaxiality ratios (r 1 /r 2) from uniaxial tension (r 1 /r 2 ¼ 0) to near-equibiaxial tension (r 1 /r 2 ¼ 0.8). The threshold stress was determined in each case by matching the major and minor stresses (and thus the local stress state) calculated by finite-element analysis to the hydride microstructures created by the thermomechanical treatment at that specific location. Using cold-worked stress-relieved Zircaloy-4, the results show that as the stress biaxiality ratio increased from uniaxial tension to near-equibiaxial tension, the threshold stress decreased from 155 to 75 MPa. To elucidate the Manuscript

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Hydride Dissolution/precipitation Behavior and Stress Statementioning

confidence: 99%