Journal of Materials for Energy Systems

, Volume 5, Issue 4, pp 188–204 | Cite as

Creep-rupture and fractographic analysis of candidate stirling engine superalloys tested in air

  • S. Bhattacharyya


The creep-rupture behavior of six candidate Stirling engine iron-base superalloys was determined in air. The alloys tested included four wrought alloys (A-286, INCOLOY® Alloy 800H* N-155, and 19-9DL) and two cast alloys (CRM-6D and XF-818). The wrought alloys were evaluated in the form of sheet, 0.79 to 0.99 mm thick. The cast alloy specimens were investment cast to shape and finish machined to 6.38-mm-gauge diameter. The creep-rupture specimens were tested in air for times up to 3000 hours, over the temperature range 650‡ to 925 ‡C. The rupture life, minimum creep rate, and time to 1 pct creep strain data were statistically analyzed and published.1,2 In this paper, microstructural and fractographic aspects of the ruptured specimens are discussed, with only a few correlational graphical analyses included for XF-818 and 19-9DL. Tests are continuing in 15 MPa hydrogen, and later these data will be correlated with air data and microstructural analysis of the specimens conducted.


Intergranular Crack Minimum Creep Rate Rupture Life Fracture Edge Dimple Rupture 
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  1. 1.
    S. Bhattacharyya: “Creep-Rupture Behavior of Six Candidate Stirling Engine Iron-Base Superalloys in High Pressure Hydrogen,”Volume I—Air Creep-Rupture Behavior, NASA CR-168071, NASA-Lewis Research Center, Cleveland, OH, December 1982.Google Scholar
  2. 2.
    S. Bhattacharyya: “Creep Rupture Behavior of Six Candidate Stirling Engine Superalloys Tested in Air,” submitted for publication in theJ. Eng. Mat. Technol., ASME, New York.Google Scholar
  3. 3.
    J. R. Stephens: “Characterization of Stirling Engine Materials,” presented at the Automotive Technology Development Contractor Coordination Meeting, Dearborn, MI, October 25–28, 1982.Google Scholar
  4. 4.
    S. Bhattacharyya, E. J. Vesely, Jr., and V. L. Hill: “High Pressure/ High Temperature Hydrogen Permeability in Candidate Stirling Engine Alloys,”J. Mat. for Energ. Syst., March 1982, vol. 3, no. 4, p. 12.CrossRefGoogle Scholar
  5. 5.
    J. R. Stephens: “Hostile Environmental Conditions Facing Candidate Alloys for the Automotive Stirling Engine,” Conference Proceedings on Environment Degradation of Engineering Materials in Hydrogen, Virginia Polytechnic Institute, Blacksburg, VA 24061, September 21–23, 1981, pp. 123–132.Google Scholar
  6. 6.
    J. R. Stephens: “Stirling Engine Materials Research,” presented at the Automotive Technology Development Contractor Coordination Meeting, Dearborn, MI, November 11–13, 1980.Google Scholar
  7. 7.
    J. A. Misencik: “Evaluation of Candidate Stirling Engine Heater Tube Alloys for 1000 Hours at 760 ‡C,” NASA TM-81578, U.S. Dept. of Energy, Washington, DC, November 1980.Google Scholar
  8. 8.
    S. Bhattacharyya, E. J. Vesely, Jr., and V. L. Hill: “Determination of Hydrogen Permeability in Uncoated and Coated Superalloys,” Interim Report, NASA CR-165209, U.S. Dept. of Energy, Office of Transportation Programs, Washington, DC, January 1981.Google Scholar
  9. 9.
    W. R. Witzke and J. R. Stephens: “Creep-Rupture Behavior of Seven Iron-Base Alloys After Long-Term Aging at 760‡ in Low Pressure Hydrogen,” NASA TM-81534, NASA-Lewis Research Center, Cleveland, OH, August 1980.Google Scholar
  10. 10.
    H. J. Frost and M. F. Ashby: “Deformation-Mechanism Maps for Pure Iron, Two Austenitic Stainless Steels, and a Low-Alloy Ferritic Steel,” Cambridge University Report, Cambridge, U.K., July 1975.Google Scholar
  11. 11.
    H. J. Frost and M. F. Ashby:Deformation Mechanism Maps, The Plasticity and Creep of Metals and Ceramics, Pergamon Press, Oxford, England, 1982.Google Scholar
  12. 12.
    F. R. Larson and J. Miller:Trans. ASME, 1952, vol. 74, p. 765.Google Scholar
  13. 13.
    S. S. Manson and A. M. Haferd: “A Linear Time-Temperature Relation for Extrapolation and Creep and Stress-Rupture Data,” NACA Technical Note 2890, March 1952.Google Scholar
  14. 14.
    S. S. Manson and W. R. Brown,Proc. ASTM, 1953, vol. 53, p. 693.Google Scholar
  15. 15.
    O. D. Sherby: “Factors Affecting the High Temperature Strength of Polycrystalline Solids,”Acta Metall., 1962, vol. 10, no. 2, pp. 135–147.CrossRefGoogle Scholar
  16. 16.
    J. E. Dorn: “The Spectrum of Activation Energies for Creep,” inCreep and Recovery, pp. 255–283, American Society for Metals, Metals Park, OH, 1957.Google Scholar
  17. 17.
    R. M. Goldhoff: “The Evaluation of Elevated Temperature Creep and Rupture Strength Data: An Historical Perspective,” inCharacterization of Materials for Service at Elevated Temperatures, G. V. Smith, ed., pp. 247–265, Publ. No. MPC-7, ASME, New York, 1978.Google Scholar

Copyright information

© American society for metals 1984

Authors and Affiliations

  • S. Bhattacharyya
    • 1
  1. 1.IIT Research InstituteChicago

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