Abstract
Inconel 718, a compressor and turbine wheel material suited for 900–1200°F applications in advanced gas turbine engines, was evaluated for long time properties and structural stability. This work included creep rupture testing and residual tensile property determination after extended times under stress exposure. Tests were conducted at 1000°F to 21,000 hr, at 1100°F to 33,000 hr, at 1200°F to 10,000 hr, and at 1300°F for 6,000 hr. In addition, optical and electron microscopy, X-ray diffraction, and X-ray fluorescence methods of phase analyses before and after exposure were carried out. Except for the expected overaging at 1300°F, there were no detrimental instabilities observed. This alloy has been selected for critical compressor and turbine wheel applications that will see service to 36,000 hr.
Similar content being viewed by others
References
Raudebaugh, R. J., and Sadowski, E. P.; “Microstructural Changes in a 42 Pet Ni, 30 Pet Cr, 26 Pet Fe Alloy During Creep Rupture Testing”, Transactions AIME, Vol. 215, 1959, pp. 23–28.
Kaufman, M., and Palty, A. E.; “The Phase Structure of Inconel 718 and 702 Alloys”, Transactions AIME, Vol. 221, 1961, pp. 1253–1262.
Wagner, H. J., and Hall, A. M.; Physical Metallurgy of Alloy 718, Defense Metal Information Center, Report No. 217, Battelle Memorial Institute, June 1965.
Raymond, E. L.; “Effect of Grain Boundary Denudation of Gamma Prime on Notch Rupture Ductility of Inconel Nickel-Chromium Alloys X750 and 718”, Transactions AIME, Vol. 239, 1967, pp. 1415–1422.
Radavich, J. F.; unpublished research.
Eiselstein, H. L.; Metallurgy of a Columbium-Hardened Nickel-Chromium Alloy, ASTM Technical Publication No. 369, American Society for Testing and Materials, 1965.
Kotval, P. S.; “Identification of the Strengthening Phase in Inconel Alloy 718”, Transactions AIME, Vol. 242, 1968, pp. 1764.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Barker, J.F., Ross, E.W. & Radavich, J.F. Long Time Stability Of Inconel 718. JOM 22, 31–41 (1970). https://doi.org/10.1007/BF03355624
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF03355624