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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 and Hang Wang
Published/Copyright: March 12, 2015
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 106 Issue 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

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https://doi.org/10.3139/146.111182
Keywords for this article
High-temperature alloys; Ni-base superalloys; Discontinuous precipitation; Recrystallisation; Thermodynamics

Articles in the same Issue

  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
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