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Fatigue testing of metallurgically-bonded EBR-II superheater tubes by T.C. Totemeier; D.M. Wachs; D.L. Porter; N. Kisohara is a Materials Science article available to read on EtoBox.

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Fatigue crack growth tests were performed on 2 1 = 4 Cr-1Mo steel specimens machined from ex-service experimental breeder reactor-II (EBR-II) superheater duplex tubes. The tubes had been metallurgically-bonded with a 100 lm thick Ni layer; the specimens incorporated this bond layer. Fatigue crack growth tests were performed at room temperature in air and at 400 °C in air and humid Ar; cracks were grown at varied levels of constant DK. In all conditions the presence of the Ni bond layer was found to result in a net retardation of growth as the crack passed through the layer. The mechanism of retardation was identified as a disruption of crack planarity and uniformity after passing through the porous bond layer. Full crack arrest was only observed in a single test performed at near-threshold DK level (12 MPa p m) at 400 °C. In this case the crack tip was blunted by oxidation of the base steel at the steel-nickel interface.

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Author

T.C. Totemeier; D.M. Wachs; D.L. Porter; N. Kisohara

Publisher

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

Published

2008

Language

EN

Field

Materials Science (Physical Sciences)