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

Fisk, M.; Andersson, J.; du Rietz, R.; Haas, Sylvio LU and Hall, Stephen LU (2014) In Materials Science & Engineering: A 612. p.202-207
Abstract
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... (More)
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. (Less)
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organization
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Contribution to journal
publication status
published
subject
keywords
Nucleation, SAXS, Vickers microhardness, Nickel based superalloys, Age, hardening, IN718
in
Materials Science & Engineering: A
volume
612
pages
202 - 207
publisher
Elsevier
external identifiers
  • wos:000340331300025
  • scopus:84903696081
ISSN
1873-4936
DOI
10.1016/j.msea.2014.06.036
language
English
LU publication?
yes
id
383c4306-1b53-4140-b790-49e378ad6c90 (old id 4656267)
date added to LUP
2014-09-24 14:00:48
date last changed
2017-08-20 03:00:12
@article{383c4306-1b53-4140-b790-49e378ad6c90,
  abstract     = {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.},
  author       = {Fisk, M. and Andersson, J. and du Rietz, R. and Haas, Sylvio and Hall, Stephen},
  issn         = {1873-4936},
  keyword      = {Nucleation,SAXS,Vickers microhardness,Nickel based superalloys,Age,hardening,IN718},
  language     = {eng},
  pages        = {202--207},
  publisher    = {Elsevier},
  series       = {Materials Science & Engineering: A},
  title        = {Precipitate evolution in the early stages of ageing in Inconel 718 investigated using small-angle x-ray scattering},
  url          = {http://dx.doi.org/10.1016/j.msea.2014.06.036},
  volume       = {612},
  year         = {2014},
}