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Precipitate evolution in the early stages of ageing in Inconel 718 investigated using small-angle x-ray scattering

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Author

Summary, in English

Microstructural evolution during the early stages of ageing (less than one hour) in a Ni-Cr-Fe based superalloy Inconel 718 (IN718) has been investigated using Small-Angle X-ray Scattering (SAXS). The effects of precipitate kinetics on the precipitate size distribution are compared indirectly with SAXS measurements by using Vickers microhardness data. The microhardness increased after 4 min of ageing at a temperature of 760 degrees C, although the recorded SAXS data did not reveal the precipitate size distribution. This indicates that the precipitates had not evolved enough to be detected, but still a small number of precipitates increased the yield strength. After ageing the alloy for the shortest period for which data were available, 8 min, clear evidence of precipitates could be found from the SAXS data, showing that the gamma '' - precipitates are about 6 nm in width and 3 nm in height. (C) 2014 Elsevier B.V. All rights reserved.

Publishing year

2014

Language

English

Pages

202-207

Publication/Series

Materials Science & Engineering: A

Volume

612

Document type

Journal article

Publisher

Elsevier

Topic

  • Physical Sciences
  • Mechanical Engineering
  • Natural Sciences

Keywords

  • Nucleation
  • SAXS
  • Vickers microhardness
  • Nickel based superalloys
  • Age
  • hardening
  • IN718

Status

Published

ISBN/ISSN/Other

  • ISSN: 1873-4936