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Research on the creep fracture mechanism of FGH95 Ni-based superalloy

  • Xie Jun , Tian Sugui , Zhou Xiaoming , Su Yong and Liu Jiao
Published/Copyright: November 5, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 11

Abstract

The creep fracture mechanism of FGH95 superalloy has been investigated by means of microstructure observation and creep behaviour measurement. Results show that, after solution treatment at 1150°C, the coarser γ′ precipitates distribute in the wider regions of previous particle boundaries. As the solution temperature increases to 1165°C, the grains grow in the alloy and carbide films precipitate along the grain boundaries. When the alloy is solution treated at 1160°C, the coarser γ′ phase in boundary regions is fully dissolved, and granular carbides precipitate along the grain boundaries, which may effectively restrain boundary sliding and hinder dislocation movements to improve the creep resistance of the alloy. During creep, the deformation feature of the alloy is that slipping dislocations with single or double orientations and stacking faults are activated in the alloy. As creep progresses, the amount of slip traces increases to bring about stress concentration and cause microcracks to be initiated and propagated along the grain boundaries up to the rupture of the alloy.

Keywords: FGH95 nickel-based superalloy; Microstructure; Creep fracture mechanism
* Correspondence address, Su-gui Tian (Professor), School of Materials Science and Engineering, Shenyang University of Technology, No. 111, Shenliao West Road, Economic and Technological Development Zone, Shenyang, 110870, P. R. China, Tel.: +86-24-25494089, Fax: +86-24-25496768, E-mail:

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Received: 2012-10-09
Accepted: 2013-06-24
Published Online: 2013-11-05
Published in Print: 2013-11-14

© 2013, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110971
Keywords for this article
FGH95 nickel-based superalloy; Microstructure; Creep fracture mechanism

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Solubility of nitrogen in ferrite; the Fe–N phase diagram
  5. The Li–C phase equilibria
  6. Experimental study of phase equilibria in the “SnO”–SiO2–“FeO” system at silica saturation, and fixed oxygen partial pressures at 1473 K
  7. The evolution of Y distribution during the processing route of mechanically alloyed iron studied by means of atom probe tomography
  8. Oscillative surface morphology in peritectic NiAl using phase-field modeling
  9. Microstructural characterisation of oxide layer developed by sulphuric anodisation on 2017A alloys
  10. Wear and corrosion behaviour of AISI 310 and AISI 316 stainless steels in synthetic mine water
  11. Superplasticity of coarse-grained Ti-13V-11Cr-3Al alloy
  12. Research on the creep fracture mechanism of FGH95 Ni-based superalloy
  13. Hot pressing of Al2O3 matrix ceramic materials improved by diopside additive
  14. Tungsten heavy alloy as a filler metal for repair welding of dies for high pressure die casting
  15. A one-pot synthesis of Ag/α-Fe2O3 nanoplates with gelatin and their photocatalytic activity
  16. Short Communications
  17. Effects of coating solution concentration on the interlaminar shear strength of carbon fiber/epoxy/nano-CaCO3 composites
  18. People
  19. Dr.-Ing. Christa Blank
  20. DGM News
  21. DGM News
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