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Fatigue Crack Propagation at Elevated Temperature in MAR-M002 Single Crystals

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High Temperature Alloys for Gas Turbines 1982

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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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Author information

Authors and Affiliations

  1. Department of Metallurgy and Science of Materials, Oxford University, UK

    J. S. Crompton & J. W. Martin

Authors
  1. J. S. Crompton
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  2. J. W. Martin
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Editor information

Editors and Affiliations

  1. SNECMA, Belgium

    R. Brunetaud

  2. CRM, Belgium

    D. Coutsouradis

  3. NPL, UK

    T. B. Gibbons

  4. FFV, Sweden

    Y. Lindblom

  5. CEGB, UK

    D. B. Meadowcroft

  6. Wien University, Austria

    R. Stickler

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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

  • eBook Packages: Springer Book Archive

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