ADVANCED MATERIALS & PROCESSES | JULY 2026 27 will continue to be the highest volume nickel-base alloy for many years to come. The third and final installment of this series, to appear in the September issue of AM&P, will explore the development and use of derivatives of alloy 718. For more information: John deBar- badillo, consultant, Nitech LLC, Barboursville, WV 25504, 304.809.4801, jdebarba42@icloud.com. References 1. H.L. Eiselstein, Age Hardenable Nickel Alloy, U.S. Patent 3,046,108, July 24, 1962. 2. H.L. Eiselstein, Metallurgy of a Columbium-Hardened Nickel-Chromium- Iron Alloy, Advances in the Technology of Stainless Steels and Related Alloys, ASTM STP, No. 369, p 62-79, 1965. 3. S. Patel, J.J. deBarbadillo, and S. Coryell, Superalloy 718: Evolution of the Alloy from High to Low Temperature Application, Proc. 9th Int. Conf. Superalloy 718 and Derivatives, TMS, p 23-49, 2018. 4. P. Schilke, J.J. Pepe, and R.C. Schwant, Alloy 706 Metallurgy and Turbine Wheel Applications, Superalloys 718, 625, 706 and Various Derivatives, TMS, p 1-11, 1994. 5. R. Schwant, et al., Extending the Size of Alloy 718 Rotating Components, Superalloys 718, 625, 706 and Derivatives 2005, TMS, p 15-24, 2005. 6. R. Purgert, et al., Materials for Advanced Ultra-Supercritical (A-USC) Steam Turbines — A-USC Component Demonstration, Final Technical Report, OSTI report 1875111, July 2022, doi. org/10.2172/1875111. 7. J. Halchak, Rocketdyne, personal communication. 8. F.T. Inouye, et al., Application of Alloy 718 in M-1 Engine Components, NASA Report CR-788, NASA, 1967. 9. R.P. Jewett and J.A. Halchak, The Use of Alloy 718 in the Space Shuttle Main Engine, Superalloys 718, 625 and Various Derivatives, TMS, p 749-760, 1991. 10. R.R. Gradl, et al., Metal Additive Manufacturing for Propulsion Appli- cations, AIAA Progress in Astronautics and Aeronautics Book Series, 2022, arc. aiaa.org/doi/book/10.2514/4.106279. 11. H.L. Martin, et al., Effects of Low Temperatures on the Mechanical Properties of Structural Metals, NASA SP 5012(01), 1968. 12. J.C. Laurence, High Field Electromagnets at NASA Lewis Research Center, NASA Report TN D-4910, 1968. 13. V. Barabash, et al., Materials Challenges for ITER — Current Status and Future Activities, Journal of Nuclear Materials, Elsevier B.V., p 21-32, 2007. 14. W.L. Kimmerle, M.T. Miglin, and J.L. Nelson, Stress Corrosion Cracking of Alloy 718 in Pressurized Water Reactor Primary Water, Superalloy 718 Metallurgy and Application, TMS, p 417426, 1989. 15. Inconel Alloy 718, The International Nickel Co. Inc, 1968. 16. R.B. Bhavsar, A. Collins, and S. Silverman, Use of Alloy 718 and 725 in the Oil and Gas Industry, Superalloy 718, 625 and Various Derivatives, TMS, p 47-55, 2001. 17. O. Onyewuenyi, Alloy 718 — Alloy Optimization for Applications in Oil and Gas Production, Superalloy 718: Metallurgy and Applications, TMS, p 345362, 1989. 18. Specification of Nickel Base Alloy 718 (UNS N07718) for Oil and Gas Drilling and Production Equipment, API Specification 6A718, March 2004. 19. J.J. deBarbadillo and S.K. Mannan, Alloy 718 for Oilfield Applications, Proc. 7th Int. Conf. Superalloy 718 and Derivatives, TMS, p 493-502, 2014. 20. T.A. Roach, Alloy 718 Fasteners, Versatility and Reliability for Aerospace Design, Superalloy 718: Metallurgy and Applications, TMS, p 381-389, 1989. 21. R.A. Heacox, Influence of Cold Reduction and Heat Treatment on the Properties and Microstructure of Alloy 718 Fastener Stock, Superalloys — Processing, Batelle, p 1-15, 1972. Images of SLM Inconel 718 alloy microstructure obtained by scanning electron microscopy using (a) secondary electron and (b) back scattered electron. Note the different layers across the laser scanning paths. Courtesy of ASM Handbook, Vol. 24, Additive Manufacturing Processes. (a) (b) Read the first article in this series in AM&P May, which intro- duces the initial discovery and early impact of alloy 718 on aerospace engines, and highlights the contributions of Herbert Eiselstein, FASM, to superalloy development.
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