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Spatially resolved structural and chemical properties of the white layer in machined Inconel 718 super alloy

A. B. Marçal, L. LU ; Dierks, H. LU ; Bushlya, V. LU ; Lazar, I. LU orcid ; Dzhigaev, D. LU orcid ; Zhe, R. ; Rysov, R. ; Björling, A. LU ; Sprung, M. and Mikkelsen, A. LU , et al. (2024) In Materials and Design 239.
Abstract

Inconel 718 is one type of nickel-based alloy used for a large range of applications, including gas turbines and aeroengines components. Although mechanical and thermodynamic properties of this material have been deeply studied in the past years, a method able to investigate local properties of the thin white layer formed on the alloy surface after machining remains challenging. Here, a 90 nm X-ray beam is used to probe the local strain, crystal orientation, and chemical composition of grains in the white layer. Data reveals mosaicity induced by the tool during machining. The high spatial resolution, combined with crystal lattice sensitivity, shows that the average grain size is around 30 nm throughout the white layer, while the strain... (More)

Inconel 718 is one type of nickel-based alloy used for a large range of applications, including gas turbines and aeroengines components. Although mechanical and thermodynamic properties of this material have been deeply studied in the past years, a method able to investigate local properties of the thin white layer formed on the alloy surface after machining remains challenging. Here, a 90 nm X-ray beam is used to probe the local strain, crystal orientation, and chemical composition of grains in the white layer. Data reveals mosaicity induced by the tool during machining. The high spatial resolution, combined with crystal lattice sensitivity, shows that the average grain size is around 30 nm throughout the white layer, while the strain is anisotropic nearest to the surface. Results provide new insights on the basic properties of the white layer in super alloys, revealing important information about the impact of finish machining which might help to explain fatigue and cracking formation on these materials during their usage phase.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Inconel 718, White layer, X-ray diffraction, X-ray fluorescence
in
Materials and Design
volume
239
article number
112789
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85186529713
ISSN
0264-1275
DOI
10.1016/j.matdes.2024.112789
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2024 The Author(s)
id
fdeeb48e-eccb-413c-9645-f0c9b1ea5205
date added to LUP
2024-03-18 13:14:51
date last changed
2024-03-20 03:04:59
@article{fdeeb48e-eccb-413c-9645-f0c9b1ea5205,
  abstract     = {{<p>Inconel 718 is one type of nickel-based alloy used for a large range of applications, including gas turbines and aeroengines components. Although mechanical and thermodynamic properties of this material have been deeply studied in the past years, a method able to investigate local properties of the thin white layer formed on the alloy surface after machining remains challenging. Here, a 90 nm X-ray beam is used to probe the local strain, crystal orientation, and chemical composition of grains in the white layer. Data reveals mosaicity induced by the tool during machining. The high spatial resolution, combined with crystal lattice sensitivity, shows that the average grain size is around 30 nm throughout the white layer, while the strain is anisotropic nearest to the surface. Results provide new insights on the basic properties of the white layer in super alloys, revealing important information about the impact of finish machining which might help to explain fatigue and cracking formation on these materials during their usage phase.</p>}},
  author       = {{A. B. Marçal, L. and Dierks, H. and Bushlya, V. and Lazar, I. and Dzhigaev, D. and Zhe, R. and Rysov, R. and Björling, A. and Sprung, M. and Mikkelsen, A. and Lenrick, F. and M'Saoubi, R. and Wallentin, J.}},
  issn         = {{0264-1275}},
  keywords     = {{Inconel 718; White layer; X-ray diffraction; X-ray fluorescence}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Materials and Design}},
  title        = {{Spatially resolved structural and chemical properties of the white layer in machined Inconel 718 super alloy}},
  url          = {{http://dx.doi.org/10.1016/j.matdes.2024.112789}},
  doi          = {{10.1016/j.matdes.2024.112789}},
  volume       = {{239}},
  year         = {{2024}},
}