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Structural changes in Ti1-xAlxN coatings during turning : A XANES and EXAFS study of worn tools

Rogström, L. ; Moreno, M. ; Andersson, J. M. ; Johansson-Jöesaar, M. P. ; Odén, M. ; Klementiev, K. LU ; Näslund, L. and Magnuson, M. (2023) In Applied Surface Science 612.
Abstract

Structural changes in Ti1-xAlxN coated tool inserts used for turning in 316L stainless steel were investigated by XANES, EXAFS, EDS, and STEM. For coarse-grained fcc-structured Ti1-xAlxN coatings, with 0 ≤ x ≤ 0.62, the XANES spectrum changes with Al-content. XANES Ti 1s line-scans across the rake face of the worn samples reveals that TiN-enriched domains have formed during turning in Ti0.47Al0.53N and Ti0.38Al0.62N samples as a result of spinodal decomposition. The XANES spectra reveal the locations on the tool in which the most TiN-rich domains have formed, indicating which part of the tool-chip contact area that experienced the highest temperature... (More)

Structural changes in Ti1-xAlxN coated tool inserts used for turning in 316L stainless steel were investigated by XANES, EXAFS, EDS, and STEM. For coarse-grained fcc-structured Ti1-xAlxN coatings, with 0 ≤ x ≤ 0.62, the XANES spectrum changes with Al-content. XANES Ti 1s line-scans across the rake face of the worn samples reveals that TiN-enriched domains have formed during turning in Ti0.47Al0.53N and Ti0.38Al0.62N samples as a result of spinodal decomposition. The XANES spectra reveal the locations on the tool in which the most TiN-rich domains have formed, indicating which part of the tool-chip contact area that experienced the highest temperature during turning. Changes in the pre-edge features in the XANES spectra reveal that structural changes occur also in the w-TiAlN phase in fine-grained Ti0.38Al0.62N during turning. EDS shows that Cr and Fe from the steel adhere to the tool rake face during machining. Cr 1s and Fe 1s XANES show that Cr is oxidized in the end of the contact length while the adhered Fe retains in the same fcc-structure as that of the 316L stainless steel.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hard coatings, Metal cutting, TiAlN, XANES, XAS
in
Applied Surface Science
volume
612
article number
155907
publisher
Elsevier
external identifiers
  • scopus:85145598942
ISSN
0169-4332
DOI
10.1016/j.apsusc.2022.155907
language
English
LU publication?
yes
id
02aeb908-590b-40aa-9020-4e1a3c186438
date added to LUP
2023-02-16 13:36:51
date last changed
2023-02-16 13:36:51
@article{02aeb908-590b-40aa-9020-4e1a3c186438,
  abstract     = {{<p>Structural changes in Ti<sub>1-x</sub>Al<sub>x</sub>N coated tool inserts used for turning in 316L stainless steel were investigated by XANES, EXAFS, EDS, and STEM. For coarse-grained fcc-structured Ti<sub>1-x</sub>Al<sub>x</sub>N coatings, with 0 ≤ x ≤ 0.62, the XANES spectrum changes with Al-content. XANES Ti 1s line-scans across the rake face of the worn samples reveals that TiN-enriched domains have formed during turning in Ti<sub>0.47</sub>Al<sub>0.53</sub>N and Ti<sub>0.38</sub>Al<sub>0.62</sub>N samples as a result of spinodal decomposition. The XANES spectra reveal the locations on the tool in which the most TiN-rich domains have formed, indicating which part of the tool-chip contact area that experienced the highest temperature during turning. Changes in the pre-edge features in the XANES spectra reveal that structural changes occur also in the w-TiAlN phase in fine-grained Ti<sub>0.38</sub>Al<sub>0.62</sub>N during turning. EDS shows that Cr and Fe from the steel adhere to the tool rake face during machining. Cr 1s and Fe 1s XANES show that Cr is oxidized in the end of the contact length while the adhered Fe retains in the same fcc-structure as that of the 316L stainless steel.</p>}},
  author       = {{Rogström, L. and Moreno, M. and Andersson, J. M. and Johansson-Jöesaar, M. P. and Odén, M. and Klementiev, K. and Näslund, L. and Magnuson, M.}},
  issn         = {{0169-4332}},
  keywords     = {{Hard coatings; Metal cutting; TiAlN; XANES; XAS}},
  language     = {{eng}},
  month        = {{03}},
  publisher    = {{Elsevier}},
  series       = {{Applied Surface Science}},
  title        = {{Structural changes in Ti<sub>1-x</sub>Al<sub>x</sub>N coatings during turning : A XANES and EXAFS study of worn tools}},
  url          = {{http://dx.doi.org/10.1016/j.apsusc.2022.155907}},
  doi          = {{10.1016/j.apsusc.2022.155907}},
  volume       = {{612}},
  year         = {{2023}},
}