Abstract
Short crack simulation (SCS) tests were used to characterize the fatigue crack growth rates da/dN and thresholds ΔKTh of a Ni-Fe superalloy proposed for conduit sheath applications in superconducting magnets at 4 K. Experiments described demonstrate the reproducibility of the SCS data and confirm that this alloy has a relatively high fatigue crack growth rate threshold at 4 K. The effects of plate thickness and thermal treatment (650°C, 180 h) on near-threshold fatigue properties are minor compared with a strong cryogenic temperature effect that increases the fatigue threshold from about 2 MPa·m1/2 at room temperature to 9 or 10 MPa·m1/2 at 4 K.
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© 1994 Springer Science+Business Media New York
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Tobler, R.L., Hwang, I.S. (1994). Fatigue Crack Thresholds of a Nickel-Iron Alloy for Superconductor Sheaths at 4 K. In: Reed, R.P., Fickett, F.R., Summers, L.T., Stieg, M. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 40. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9053-5_167
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DOI: https://doi.org/10.1007/978-1-4757-9053-5_167
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