Startseite Implications of solute super-saturation in growth of vaporisation-induced recrystallised grains during heat treatment in Ni-base superalloys
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Implications of solute super-saturation in growth of vaporisation-induced recrystallised grains during heat treatment in Ni-base superalloys

  • Neil D’Souza , Dean Welton und Hang Wang
Veröffentlicht/Copyright: 12. März 2015
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 106 Heft 3

Abstract

The role of vaporisation in the evolution of surface micro-structural instability has been investigated in Ni-base superalloys during heat treatment below the solvus temperature. Initial nucleation of beta (β) grains at the surface with random orientations arose from vaporisation of Ni, Co and Cr with subsequent de-stabilisation of gamma (γ) phase. Further vaporisation and inter-diffusion resulted in a discontinuous reaction (secondary reaction zone – gamma prime (γ′) matrix + topologically close packed phases with needle-like morphology). On the other hand, advancement of the secondary reaction zone grain boundary was shown to be dependent only on the solute supersaturation ahead of the boundary. The driving force for growth of the secondary reaction zone was calculated from the Gibbs energy change and nearly all of this force was available to pull the grain boundary.

Keywords: High-temperature alloys; Ni-base superalloys; Discontinuous precipitation; Recrystallisation; Thermodynamics
* Correspondence address, Dr. Hang Wang, School of Metallurgy and Materials, University of Birmingham, Birmingham, B15 2TT, U.K., Tel.: +44-1214146803, Fax: +44-1214147890, E-mail: ,

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Received: 2014-10-06
Accepted: 2014-11-21
Published Online: 2015-03-12
Published in Print: 2015-03-11

© 2015, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Phase equilibria studies of the “MnO”–Al2O3–SiO2 system in equilibrium with metallic alloy. Part 2: phase equilibria
  5. X-ray stress measurement from an imperfect Debye–Scherrer ring
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  7. Quantification of roping in aluminium sheet alloys for car body applications by combining 3D surface measurements with Fourier analysis
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  9. Evaluation of the corrosion resistance of plasma nitrided austenitic stainless steel
  10. Corrosion performance and microstructural response of A380 matrix alloy reinforced with sol–gel TiO2-coated SiC particles: a perspective on previous studies
  11. Role of chloride in the electrochemical behaviour of AZ31B Mg alloy
  12. Implications of solute super-saturation in growth of vaporisation-induced recrystallised grains during heat treatment in Ni-base superalloys
  13. Rapid synthesis of Mn3O4 powder from pyro-synthesis of ethylene glycol–metal nitrate precursor assisted by nitric acid
  14. Production of bioactive glass-derived scaffolds using citric acid porogen
  15. Short Communications
  16. Microstructure and mechanical properties of deformed Mg–Mn–Sn alloys
  17. Fast microwave synthesis and characterization of MgTi2O5
  18. Time dependent synthesis of crystalline Bi2S3 and its application as a sensitizer in SnO2 based solar cells
  19. Synthesis of cobalt-doped CdS (CdS:Co) by a simple and rapid microwave activated method and investigating optical properties
  20. People
  21. In Memoriam Volker Schumacher
  22. DGM News
  23. DGM News
https://doi.org/10.3139/146.111182
Schlagwörter für diesen Artikel
High-temperature alloys; Ni-base superalloys; Discontinuous precipitation; Recrystallisation; Thermodynamics

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Phase equilibria studies of the “MnO”–Al2O3–SiO2 system in equilibrium with metallic alloy. Part 2: phase equilibria
  5. X-ray stress measurement from an imperfect Debye–Scherrer ring
  6. Effect of heat treatment on the microstructure and tensile properties of Ti-5Al-3Zr-4Mo-3V alloy
  7. Quantification of roping in aluminium sheet alloys for car body applications by combining 3D surface measurements with Fourier analysis
  8. Dissimilar friction stir welding between polycarbonate and AA 7075 aluminum alloy
  9. Evaluation of the corrosion resistance of plasma nitrided austenitic stainless steel
  10. Corrosion performance and microstructural response of A380 matrix alloy reinforced with sol–gel TiO2-coated SiC particles: a perspective on previous studies
  11. Role of chloride in the electrochemical behaviour of AZ31B Mg alloy
  12. Implications of solute super-saturation in growth of vaporisation-induced recrystallised grains during heat treatment in Ni-base superalloys
  13. Rapid synthesis of Mn3O4 powder from pyro-synthesis of ethylene glycol–metal nitrate precursor assisted by nitric acid
  14. Production of bioactive glass-derived scaffolds using citric acid porogen
  15. Short Communications
  16. Microstructure and mechanical properties of deformed Mg–Mn–Sn alloys
  17. Fast microwave synthesis and characterization of MgTi2O5
  18. Time dependent synthesis of crystalline Bi2S3 and its application as a sensitizer in SnO2 based solar cells
  19. Synthesis of cobalt-doped CdS (CdS:Co) by a simple and rapid microwave activated method and investigating optical properties
  20. People
  21. In Memoriam Volker Schumacher
  22. DGM News
  23. DGM News
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