Influence of loading rate and hydrogen content on fracture toughness of Zr-2.5Nb pressure tube material

Bind, A.K.; Singh, R.N.; Khandelwal, H. K.; S, Sunil Kumar; Avinash, G.; Chakravartty, J.K.; Ståhle, Per

doi:10.1016/j.jnucmat.2015.05.050

Cited by 17 publications

(3 citation statements)

References 11 publications

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“…Afterward, the specimens were removed from the solution and cleaned with deionized water. The samples were then annealed at 400 • C for 4 h in air, following earlier research [20,42,50,57,59], a time sufficient to obtain the homogenous bulk distribution of hydrogen across the whole specimen.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen Embrittlement and Oxide Layer Effect in the Cathodically Charged Zircaloy-2

et al. 2020

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The present paper is aimed at determining the less investigated effects of hydrogen uptake on the microstructure and the mechanical behavior of the oxidized Zircaloy-2 alloy. The specimens were oxidized and charged with hydrogen. The different oxidation temperatures and cathodic current densities were applied. The scanning electron microscopy, X-ray electron diffraction spectroscopy, hydrogen absorption assessment, tensile, and nanoindentation tests were performed. At low oxidation temperatures, an appearance of numerous hydrides and cracks, and a slight change of mechanical properties were noticed. At high-temperature oxidation, the oxide layer prevented the hydrogen deterioration of the alloy. For nonoxidized samples, charged at different current density, nanoindentation tests showed that both hardness and Young’s modulus revealed the minims at specific current value and the stepwise decrease in hardness during hydrogen desorption. The obtained results are explained by the barrier effect of the oxide layer against hydrogen uptake, softening due to the interaction of hydrogen and dislocations nucleated by indentation test, and hardening caused by the decomposition of hydrides. The last phenomena may appear together and result in hydrogen embrittlement in forms of simultaneous hydrogen-enhanced localized plasticity and delayed hydride cracking.

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Section: Methodsmentioning

confidence: 99%

Hydrogen Embrittlement and Oxide Layer Effect in the Cathodically Charged Zircaloy-2

et al. 2020

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“…The hydrogenation can be performed by different ways: with gaseous hydrogen at elevated temperature [52][53][54][55], with gaseous hydrogen by Sievert`s apparatus [38,56,57] or with electrolytic hydrogen at room temperature in H 2 SO 4 [16,21,58,59] or in KOH [17,38,60] or at elevated temperature [12]. The cathodic charging with hydrogen at room temperature was chosen as the suitable for simultaneous, in some experiments, slow strain rate tests.…”

Section: Methodsmentioning

confidence: 99%

“…In the second series, the specimens were oxidized in the same way and afterwards charged with hydrogen without any load at 80 mA/cm 2 for 72 h. Then they removed from the solution, cleaned with distilled water and annealed for 4 h at 400°C, following earlier reports [17,32,56,58,60], to obtain the bulk distribution of hydrogen inside the whole specimen. The specimens were put in the oven already heated to the above temperature and after annealing cooled with the oven.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen degradation of pre-oxidized zirconium alloys

Szoka

Gajowiec

Zieliński

et al. 2017

Advances in Materials Science

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The presence of the oxide layers on Zr alloys may retard or enhance the hydrogen entry and material degradation, depending on the layer features. This research has been aimed to determine the effects of preoxidation of the Zircaloy-2 alloy at a different temperature on hydrogen degradation. The specimens were oxidised in laboratory air at 350ºC, 700ºC, and 900ºC. After, some samples were tensed at 10-5 strain rate and simultaneously charged with hydrogen under constant direct voltage in 1 N sulfuric acid at room temperature. Other specimens were charged without any tension, then annealed at 400ºC for 4 h and finally tensed at above strain rate. The SEM examinations were performed on the cross-sections and fracture faces of specimens. The obtained results demonstrate the effects of the oxide layer on the cathodic current and hydrogen entry, mechanical properties and the appearance of hydrides and fracture behaviour.

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