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Effect of prolonged isothermal exposure on elevated-temperature, time-dependent fatigue-crack propagation in INCONEL alloy 783

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Abstract

The effect of isothermal exposure on the elevated-temperature, time-dependent fatigue-crack propagation (FCP) in INCONEL Alloy 783 is investigated. Commercially produced Alloy 783 was annealed and aged following the standard heat-treatment procedure. One set of specimens was then isothermally exposed at 500 °C for 3000 hours. All specimens were subjected to FCP tests with various hold-time periods and sustained-loading crack-growth tests at 538 °C and 650 °C in a laboratory-air environment. Without a hold time, the as-produced and isothermally exposed materials had comparable FCP rates at both test temperatures. With hold times of 100 and 300 seconds, the as-produced and isothermally exposed specimens had comparable FCP rates at 538 °C. Hold-time testing of the as-produced material at 650 °C showed abnormal time-dependent FCP and sustained-loading crack-growth retardation. However, hold-time testing of isothermally exposed material at 650 °C showed the steady sustained-loading crack growth and fully time-dependent FCP typically observed in many superalloys. Comparison with Alloy 718 data from the literature shows that FCP rates of as-produced Alloy 718 and isothermally exposed Alloy 783 are comparable at 650 °C. A fully time-dependent FCP model based on the damage-zone concept and a thermal-activation equation is proposed to characterize the FCP behaviors.

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Author notes

  1. Longzhou Ma (Graduate Student, Research Scientist)

    Present address: Department of Mechanical Aerospace Engineering, West Virginia University Morgantown, 26506, WV

Authors and Affiliations

  1. Department of Mechanical Aerospace Engineering, West Virginia University Morgantown, 26506, WV

    Keh-Minn Chang (Professor)

  2. Materials Engineering, Harry Reid Center for Environmental Studies, University of Nevada, 89154, Las Vegas, NV

    Longzhou Ma (Graduate Student, Research Scientist)

  3. the Research and Development Department, Special Metals Corporation, 25705, Huntington, WV

    Sarwan K. Mannan (Metallurgist-Advanced)

  4. Special Metals Corporation, 25705, Huntington, WV

    Shailesh J. Patel (Director of Quality and Technology)

Authors
  1. Longzhou Ma
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  2. Keh-Minn Chang
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  3. Sarwan K. Mannan
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  4. Shailesh J. Patel
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Ma, L., Chang, KM., Mannan, S.K. et al. Effect of prolonged isothermal exposure on elevated-temperature, time-dependent fatigue-crack propagation in INCONEL alloy 783. Metall Mater Trans A 33, 3465–3478 (2002). https://doi.org/10.1007/s11661-002-0334-8

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  • DOI: https://doi.org/10.1007/s11661-002-0334-8

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