• Stefano Gialanella
  • Alessio Malandruccolo
Part of the Topics in Mining, Metallurgy and Materials Engineering book series (TMMME)


The three main groups of superalloys, cobalt-, iron-, and nickel-based, are presented, with reference to their compositional and processing aspects. The main selection criteria for designing the complex alloy compositions are illustrated. Superalloys, since the early stages of their development, have gained an ever-increasing role in the fabrication of components of gas turbine aero-engines, owing to the excellent combination of structural properties and corrosion resistance, both retained up to relatively high temperatures. These aspects have been enhanced further by processing routes, like directional solidification and single-crystal investment casting. Through the elimination of grain boundaries perpendicular to the main stress axis, a significant reduction of the diffusive creep rate has been attained. Diffusive creep is one of the deformation mechanisms in the Ashby maps, discussed in this chapter, together with another physical metallurgy issue: the superalloy strengthening by the precipitation of ordered γ′ phase. The microstructure of the superalloys and, thereby, their mechanical properties are usually refined by thermal treatments, whose main working principles are presented. Eventually the main applications of this fundamental class of alloys are introduced.


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Further Reading

  1. Durand-Charre M (1997) The Microstructure of Superalloys. CRC PressGoogle Scholar
  2. Gessinger G H (2013) Powder Metallurgy of Superalloys. Butterworth-HeinemannGoogle Scholar
  3. Kazantseva N V et al (2019) Superalloys – Analysis and Control of Failure Process. CRC PressGoogle Scholar
  1. Ott E et al (2010) Superalloy 718 and Derivatives – Proceedings of the 7th International Symposium on SUPERALLOY 718 and DERIVATIVES, Marriott Pittsburgh City Center, Pittsburgh, Pennsylvania, 10–13 Oct 2010Google Scholar
  2. Srivastava R R et al (2014) Resource recycling of superalloys and hydrometallurgical challenges. Journal of Materials Science 49 (14): 4671–4686 CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Stefano Gialanella
    • 1
  • Alessio Malandruccolo
    • 2
  1. 1.Industrial Engineering DepartmentUniversity of TrentoTrentoItaly
  2. 2.Metallurgy Industrial ConsultantBolzanoItaly

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