Resistance to hydride formation in zirconium: An emerging possibility

Krishna, K.V. Mani; Sain, Anirban; Samajdar, I.; Dey, G.K.; Srivastava, D.; Neogy, S.; Tewari, R.; Banerjee, S.

doi:10.1016/j.actamat.2006.06.004

Cited by 67 publications

(27 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Orientation estimated [19] values of (a) elastic modulus and (b) Taylor factor for deforming (below 3 lm), non-deforming (above 3 lm) and all (deforming + non-deforming) grains. Both (a) and (b) are given in percentages, so that an easy basis for comparison is made.…”

Section: Percentage Taylor Factormentioning

confidence: 99%

See 1 more Smart Citation

Heterogeneous Deformation in Single‐Phase Zircaloy 2

Sahoo

Hiwarkar

Samajdar

et al. 2008

Ceramic Transactions Series

View full text Add to dashboard Cite

Section: Percentage Taylor Factormentioning

confidence: 99%

“…4b). Figure 5 extends the distinction between the two types of grains to orientation estimated [19] quantities of elastic modulus and Taylor factor. These can, respectively, be taken as resistance to elastic and plastic deformation.…”

mentioning

confidence: 99%

Heterogeneous Deformation in Single‐Phase Zircaloy 2

Sahoo

Hiwarkar

Samajdar

et al. 2008

Ceramic Transactions Series

View full text Add to dashboard Cite

“…[3,4] Hydride formation is a complicated process, influenced by several factors including the microstructure and texture of Zr-4, applied or residual stresses, and temperature gradients. [4,5] So far, research on the precipitation and distribution of hydrides in Zr-4 acting as a fracture initiator has received considerable attention. [5,6] Observation of hydride formation in Zr-4 alloys has been conducted via various techniques such as X-ray diffraction, optical or electron microscopy, and electron backscattered diffraction (EBSD).…”

Section: Introductionmentioning

confidence: 99%

“…[4,5] So far, research on the precipitation and distribution of hydrides in Zr-4 acting as a fracture initiator has received considerable attention. [5,6] Observation of hydride formation in Zr-4 alloys has been conducted via various techniques such as X-ray diffraction, optical or electron microscopy, and electron backscattered diffraction (EBSD). [1,2,4] Sufficient information in terms of the phase, morphology, and size of hydrides, and the orientation relationship between the hydride and matrix phases can be derived from these investigations.…”

Section: Introductionmentioning

confidence: 99%

Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

Wang

Garbe

et al. 2013

Metall Mater Trans B

View full text Add to dashboard Cite

Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (δ-ZrH1.66) at a hydrogen pressure of 20 atm was found following the {111}δ-ZrH1.66//(0001) α-Zr with the surrounding α-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normaltransverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations clearly identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially formed on the sample surface, and the concentrated hydrides precipitating at the edges/corner of the sample were observed. The causes for the localized hydride accumulation were also discussed. Disciplines Engineering | Science and Technology Studies Publication DetailsWang, Z., Garbe, U., Li, H., Harrison, R. P., Kaestner, A. & Lehmann, E. (2014 Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (d-ZrH 1.66 ) at a hydrogen pressure of 20 atm was found following the {111} d-ZrH1.66 //(0001) a-Zr with the surrounding a-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normal-transverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations clearly identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially formed on the sample surface, and the concentrated hydrides precipitating at the edges/ corner of the sample were observed. The causes for the localized hydride accumulation were also discussed.

show abstract

“…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%

Hydrogen degradation of pre-oxidized zirconium alloys

Szoka

Gajowiec

Zieliński

et al. 2017

Advances in Materials Science

View full text Add to dashboard Cite

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.

show abstract

Resistance to hydride formation in zirconium: An emerging possibility

Cited by 67 publications

References 49 publications

Heterogeneous Deformation in Single‐Phase Zircaloy 2

Heterogeneous Deformation in Single‐Phase Zircaloy 2

Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

Hydrogen degradation of pre-oxidized zirconium alloys

Contact Info

Product

Resources

About