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Morphology evolution of γ′ precipitates in GTD-111 Ni-based superalloy with heat treatment parameters

  • Mohamad Berahmand and Seyed Abdolkarim Sajjadi
Published/Copyright: March 30, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 3

Abstract

GTD-111 is an Ni-based superalloy used in manufacturing of gas turbine blades. The superalloy attains appropriate high temperature strength through precipitation hardening. In this research the effect of isothermal aging on the morphology evolution and characteristics of precipitates was investigated. Two different heat treatment cycles were applied to the specimens. In cycle I all samples were solution-treated at 1 200 °C for 4 h and water quenched to obtain supersaturated solid solution. A microstructure containing fine γ′ precipitates was produced after heat treatment cycle I. The second heat treatment, cycle II, consisted of reheating of the specimens in the precipitate partial dissolution zone at 1 150 °C for 2 h to get coarse primary precipitates, and then water quenching to obtain fine secondary precipitates. The precipitate coarsening in the fine and duplex size precipitate distribution was studied by means of aging of the specimens for various times at 1 000 °C. The results showed that during long-term annealing of the single size distribution (Cycle Ι), precipitates line up to reduce interactive free energy and grow to fairly coarse sizes along a direction. In cycle ΙΙ, the precipitates were split into a group of eight small cuboids or pairs of parallel plates and a large number of γ′ particles were closely aligned along a direction.

Keywords: GTD-111; γ′ precipitate; Coarsening; Splitting; Rafting
* Correspondence address, Seyed Abdolkarim Sajjadi, Dept. of Department of Metallurgical and Materials Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Vakil-Abad Blvd., Mashhad, Iran. Tel./Fax: 0098-511-8763305, E-mail:

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Received: 2011-3-30
Accepted: 2012-8-9
Published Online: 2014-03-30
Published in Print: 2013-03-14

© 2013, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110856
Keywords for this article
GTD-111; γ′ precipitate; Coarsening; Splitting; Rafting

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. The thermodynamics of boron extraction from liquid silicon using SiO2–CaO–MgO slag treatment
  5. Viscosity estimation of semi-solid alloys based on thermal simulation compression tests
  6. Original Contributions
  7. Experimental study of phase equilibria in the “SnO”–CaO–SiO2 system in equilibrium with tin metal
  8. Prediction of the solidification path of Al-4.37Cu-27.02Mg ternary eutectic alloy with a unified microsegregation model coupled with Thermo-Calc
  9. Evaluation of the effective diffusion coefficient of boron in the Fe2B phase in the presence of chemical stresses
  10. Morphology evolution of γ′ precipitates in GTD-111 Ni-based superalloy with heat treatment parameters
  11. Hot forming of a new steel used in stamping dies and tooling
  12. Mechanical properties and corrosion behaviour of freestanding, precipitate-free magnesium WE43 thin films
  13. Sliding wear performance of Fe-, Ni- and Co-based hardfacing alloys for PTA cladding
  14. The suitability of selected austenitic stainless steels and hastelloy C276 alloys as substrates for thin film deposition using spray pyrolysis
  15. Synthesis, structural, optical and thermal analysis of nanostructured ZnO
  16. Electrical conductivity variation of (Bi2Te3)0.25(Sb2Te3)0.75 crystal grown using the zone melting method
  17. X-ray Absorption Near Edge Structure Studies of Pb1-xMnxTe(In, Ga) Systems
  18. DGM News
  19. DGM News
  20. Grain refining of aluminium alloys and silicon by means of boron-nitride particles
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