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Evolution of γ′ morphology and γ/γ′ lattice parameter misfit in a nickel-based superalloy during non-equilibrium cooling

  • Łukasz Rakoczy , Grzegorz Cempura , Adam Kruk , Aleksandra Czyrska-Filemonowicz and Anna Zielińska-Lipiec
Published/Copyright: January 11, 2019
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 110 Issue 1

Abstract

The change of γ′ phase morphology in quenched Ni-based superalloy strengthened by γ′ precipitates was investigated by means of scanning electron microscopy and X-ray diffraction. Lattice parameters of γ and γ′ phases and subsequently the δ parameter were calculated. Relatively high content of gamma prime formers resulted in a substantially high volume fraction of precipitates in the dendrite cores. The volume fraction of γ′ phase was significantly decreased due to dissolution of precipitates in the surrounding matrix, as a result of short-term subsolidus exposure. The lattice parameter of γ′ phase was higher than that of γ phase, which results in a positive δ parameter in fully heat treated (FHT) and also FHT+ Quench conditions. For (200) and (220) reflections the γ/γ′ misfit was lower in the FHT + Q sample.

Keywords: γ/γ′ misfit; γ′ phase; Superalloys; Quenching; Non-equilibrium cooling
*Correspondence address, Łukasz Rakoczy, M. Sc., Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland, Tel.: +48126172621, E-mail:

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Received: 2017-12-14
Accepted: 2018-10-15
Published Online: 2019-01-11
Published in Print: 2019-01-09

© 2019, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111729
Keywords for this article
γ/γ′ misfit; γ′ phase; Superalloys; Quenching; Non-equilibrium cooling

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. XVI International Conference on Electron Microscopy
  5. Original Contributions
  6. Application of analytical electron microscopy and FIB-SEM tomographic technique for phase analysis in as-cast Allvac 718Plus superalloy
  7. Microstructure and properties of laser interference crystallized amorphous FeSiB ribbon
  8. Analysis of amorphous regions in severely marformed NiTi shape memory alloy
  9. Structure of MgLiAl alloys after various routes of severe plastic deformation studied by TEM
  10. Microstructure and selected mechanical and electrical property analysis of Sr-doped LaCoO3 perovskite thin films deposited by the PLD technique
  11. Microstructure of an oxide scale formed on ATI 718Plus superalloy during oxidation at 850 °C characterised using analytical electron microscopy
  12. Effect of powder morphology on the microstructure and properties of cold sprayed Ni coatings
  13. Microstructure of Ti/Al multilayer foils ignited with electric current
  14. Evolution of γ′ morphology and γ/γ′ lattice parameter misfit in a nickel-based superalloy during non-equilibrium cooling
  15. Effect of heat treatment on the precipitation hardening in FeNiCoAlTaB shape memory alloys
  16. The structure and formation mechanism of FeS2/Fe3S4/S8 nanocomposite synthesized using spherical shaped Fe3O4 nanoparticles as the precursor
  17. Short Communications
  18. Characterization of Inconel 625 surface layer modified by laser shock processing
  19. DGM News
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