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Hydride blister formation in Zr–2.5wt%Nb pressure tube alloy by R.N Singh; R Kishore; T.K Sinha; B.P Kashyap is a Materials Science article available to read on EtoBox.

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Hydride blisters were grown over a period of 5-91 days under controlled thermal boundary condition using Zr-2.5wt%Nb pressure tube sections. Rectangular plate type specimens were hydrided to hydrogen concentration in the range of 20-250 ppm by weight and homogenized at 400 °C. These specimens were held in a specially fabricated jig capable of producing the required thermal gradients. The bulk specimen and the cold spot temperatures were maintained in the range of 270-400 °C and 40-100 °C respectively. Depending on the thermal gradients employed, two types of blister morphology were identified. The type I blister was single, round and located at the cold spot region whereas the type II blister consisted of several small blisters along a ring around the cold spot. Microstructural examination of the blister cross-section revealed three regions; a single-phase region consisting of hydrides, a region consisting of matrix containing both radial and circumferential hydrides, and another region consisting of matrix and circumferential hydrides. An attempt was made to rationalize the observed radial-circumferential hydride platelet orientation. Hydride blister growth rates were found to var

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Author

R.N Singh; R Kishore; T.K Sinha; B.P Kashyap

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-3115)

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)