Abstract
The effect of frequency on the rate of fatigue crack propagation in MAR M002 single crystals has been studied at a test temperature of 600°C. Centrally cracked plate specimens have been tested in air, and crack extension along { 100 } has been monitored by a DC potential drop method. da/dn versus ΔK curves are presented for test frequencies of 10 Hz, 1 Hz and 0.1 Hz. Near the fatigue threshold and near Kc, an increase in da/dn with increasing frequency is observed, but at intermediate ΔK the opposite effect is found. Scanning electron fractography revealed the important effect of ‘script’ carbide inclusions upon the crack extension process.
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© 1982 ECSC, EEC, EAEC, Brussels and Luxembourg
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Crompton, J.S., Martin, J.W. (1982). Fatigue Crack Propagation at Elevated Temperature in MAR-M002 Single Crystals. In: Brunetaud, R., Coutsouradis, D., Gibbons, T.B., Lindblom, Y., Meadowcroft, D.B., Stickler, R. (eds) High Temperature Alloys for Gas Turbines 1982. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7907-9_26
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DOI: https://doi.org/10.1007/978-94-009-7907-9_26
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-009-7909-3
Online ISBN: 978-94-009-7907-9
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