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First evidence of grain boundary serration in a specifically heat treated wrought Alloy 625 Ni-based superalloy

  • Mathieu Terner , Ji-Won Lee , Jin-Hyeok Kim and Hyun-Uk Hong
Published/Copyright: August 30, 2018
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 109 Issue 9

Abstract

Grain boundary serration is an effective way to increase the high temperature resistance of superalloys and steels. The popular Alloy 625 Ni-based superalloy was until now believed not to form serrated grain boundaries based on previous considerations of serrability criteria. Following the recent strain-induced serration mechanism, a special heat treatment involving continuous slow cooling between the solution and aging temperature was designed. As a result, significant serration was observed for the first time for Alloy 625 promoted by slow cooling. Grain boundary M23C6 carbides were systematically detected from either degenerescence of solidification MC carbides or heterogeneous nucleation. Upon aging, serration amplitude increased and precipitation of the δ phase proliferated.

Keywords: Grain boundary serration; Alloy 625; Precipitation; Heat treatment
*Correspondence address, Prof. Hyun-Uk Hong, Department of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon, Gyeongnam 51140, Republic of Korea, Tel.: +82-55-213-3699, Fax: +82-55-261-7017, E-mail:

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Received: 2018-02-19
Accepted: 2018-04-04
Published Online: 2018-08-30
Published in Print: 2018-09-14

© 2018, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Effect of lubricant additives on the tribological behavior of aluminum alloy against steel
  5. First evidence of grain boundary serration in a specifically heat treated wrought Alloy 625 Ni-based superalloy
  6. Precipitation characteristics of a nickel-based single-crystal superalloy after long-term thermal exposure
  7. Dynamic evolution of the metastable structure and nano-precipitation of 7055 aluminum alloy under thermal deformation
  8. Microstructural evolution and high-temperature compressive properties of an extruded Mg–Dy–Zn alloy sheet
  9. Microstructural characterization and residual stress distribution in a nanostructured austenitic stainless steel
  10. Microstructural evolution, phase selection and properties of CoCrCuFeMnxNi high-entropy alloys
  11. Thermodynamic modelling of the Hf–Pt system
  12. Mechanical, tribological and oxidation resistance properties of Ni-based self-lubricating composite coatings at elevated temperature by APS
  13. Pore formation mechanism of porous Ni–Cr–Al alloys prepared by elemental powder reactive synthesis
  14. Co3O4/carbon nano-onions composite as supercapacitor electrode and its excellent electrochemical performance
  15. Short Communications
  16. Reduced graphene oxide–SnO nanocomposites with good visible-light photoactivity
  17. DGM News
  18. DGM News
https://doi.org/10.3139/146.111674
Keywords for this article
Grain boundary serration; Alloy 625; Precipitation; Heat treatment

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Effect of lubricant additives on the tribological behavior of aluminum alloy against steel
  5. First evidence of grain boundary serration in a specifically heat treated wrought Alloy 625 Ni-based superalloy
  6. Precipitation characteristics of a nickel-based single-crystal superalloy after long-term thermal exposure
  7. Dynamic evolution of the metastable structure and nano-precipitation of 7055 aluminum alloy under thermal deformation
  8. Microstructural evolution and high-temperature compressive properties of an extruded Mg–Dy–Zn alloy sheet
  9. Microstructural characterization and residual stress distribution in a nanostructured austenitic stainless steel
  10. Microstructural evolution, phase selection and properties of CoCrCuFeMnxNi high-entropy alloys
  11. Thermodynamic modelling of the Hf–Pt system
  12. Mechanical, tribological and oxidation resistance properties of Ni-based self-lubricating composite coatings at elevated temperature by APS
  13. Pore formation mechanism of porous Ni–Cr–Al alloys prepared by elemental powder reactive synthesis
  14. Co3O4/carbon nano-onions composite as supercapacitor electrode and its excellent electrochemical performance
  15. Short Communications
  16. Reduced graphene oxide–SnO nanocomposites with good visible-light photoactivity
  17. DGM News
  18. DGM News
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