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Strain and phase evolution in TiAlN coatings during high-speed metal cutting : An in operando high-energy x-ray diffraction study

Moreno, M. ; Andersson, J. M. ; Eriksson, J. ; Alm, P. ; Hedström, K. ; M'Saoubi, R. LU ; Schramm, I. C. ; Schell, N. ; Johansson-Jöesaar, M. P. and Odén, M. , et al. (2024) In Acta Materialia 263.
Abstract

We report on phase and strain changes in Ti1-xAlxN (0 ≤ x ≤ 0.61) coatings on cutting tools during turning recorded in operando by high-energy x-ray diffractometry. Orthogonal cutting of AISI 4140 steel was performed with cutting speeds of 360–370 m/min. Four positions along the tool rake face were investigated as a function of time in cut. Formation of γ-Fe in the chip reveals that the temperature exceeds 727 °C between the tool edge and the middle of the contact area when the feed rate is 0.06 mm/rev. Spinodal decomposition and formation of wurtzite AlN occurs at the positions of the tool with the highest temperature for the x ≥ 0.48 coatings. The strain evolution in the chip reveals that the mechanical stress is... (More)

We report on phase and strain changes in Ti1-xAlxN (0 ≤ x ≤ 0.61) coatings on cutting tools during turning recorded in operando by high-energy x-ray diffractometry. Orthogonal cutting of AISI 4140 steel was performed with cutting speeds of 360–370 m/min. Four positions along the tool rake face were investigated as a function of time in cut. Formation of γ-Fe in the chip reveals that the temperature exceeds 727 °C between the tool edge and the middle of the contact area when the feed rate is 0.06 mm/rev. Spinodal decomposition and formation of wurtzite AlN occurs at the positions of the tool with the highest temperature for the x ≥ 0.48 coatings. The strain evolution in the chip reveals that the mechanical stress is largest closest to the tool edge and that it decreases with time in cut for all analyzed positions on the rake face. The strain evolution in the coating varies between coatings and position on the rake face of the tool and is affected by thermal stress as well as the applied mechanical stress. Amongst others, the strain evolution is influenced by defect annihilation and, for the coatings with highest Al-content (x ≥ 0.48), phase changes.

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type
Contribution to journal
publication status
published
subject
keywords
Coatings, In situ, Synchrotron diffraction, Wear mechanisms, X-ray diffraction
in
Acta Materialia
volume
263
article number
119538
publisher
Elsevier
external identifiers
  • scopus:85178211408
ISSN
1359-6454
DOI
10.1016/j.actamat.2023.119538
language
English
LU publication?
yes
id
3d52849b-ff22-4f19-83e2-2256739b057d
date added to LUP
2023-12-18 15:13:56
date last changed
2023-12-18 15:13:56
@article{3d52849b-ff22-4f19-83e2-2256739b057d,
  abstract     = {{<p>We report on phase and strain changes in Ti<sub>1-x</sub>Al<sub>x</sub>N (0 ≤ x ≤ 0.61) coatings on cutting tools during turning recorded in operando by high-energy x-ray diffractometry. Orthogonal cutting of AISI 4140 steel was performed with cutting speeds of 360–370 m/min. Four positions along the tool rake face were investigated as a function of time in cut. Formation of γ-Fe in the chip reveals that the temperature exceeds 727 °C between the tool edge and the middle of the contact area when the feed rate is 0.06 mm/rev. Spinodal decomposition and formation of wurtzite AlN occurs at the positions of the tool with the highest temperature for the x ≥ 0.48 coatings. The strain evolution in the chip reveals that the mechanical stress is largest closest to the tool edge and that it decreases with time in cut for all analyzed positions on the rake face. The strain evolution in the coating varies between coatings and position on the rake face of the tool and is affected by thermal stress as well as the applied mechanical stress. Amongst others, the strain evolution is influenced by defect annihilation and, for the coatings with highest Al-content (x ≥ 0.48), phase changes.</p>}},
  author       = {{Moreno, M. and Andersson, J. M. and Eriksson, J. and Alm, P. and Hedström, K. and M'Saoubi, R. and Schramm, I. C. and Schell, N. and Johansson-Jöesaar, M. P. and Odén, M. and Rogström, L.}},
  issn         = {{1359-6454}},
  keywords     = {{Coatings; In situ; Synchrotron diffraction; Wear mechanisms; X-ray diffraction}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Acta Materialia}},
  title        = {{Strain and phase evolution in TiAlN coatings during high-speed metal cutting : An in operando high-energy x-ray diffraction study}},
  url          = {{http://dx.doi.org/10.1016/j.actamat.2023.119538}},
  doi          = {{10.1016/j.actamat.2023.119538}},
  volume       = {{263}},
  year         = {{2024}},
}