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Investigation of wear initiation in CVD coated cermet tools during stainless steel turning

Sirtuli, Larissa Juliana LU orcid ; Shoja, Siamak ; Boing, Denis ; Bushlya, Volodymyr LU and Norgren, Susanne LU (2026) In International Journal of Refractory Metals and Hard Materials 138.
Abstract

CVD (chemical vapor deposition) coated cutting tools typically exhibit thermal cracks caused by the mismatch in coefficients of thermal expansion (CTEs) between coating and cemented carbide. These cracks act as weak points during stainless steel machining, contributing to premature tool wear. As a strategy to suppress thermal cracks formation, we investigate replacing the conventional cemented carbide with a cermet substrate, which has a CTE closely matching that of the coating. Therefore, in this work we analyze and compare the influence of a cermet substrate on wear initiation in CVD coated tools during AISI 316Ti stainless steel turning. Two coatings were evaluated: (i) nanolayered κ-Al2O3–TiN/Ti(C,N) and (ii)... (More)

CVD (chemical vapor deposition) coated cutting tools typically exhibit thermal cracks caused by the mismatch in coefficients of thermal expansion (CTEs) between coating and cemented carbide. These cracks act as weak points during stainless steel machining, contributing to premature tool wear. As a strategy to suppress thermal cracks formation, we investigate replacing the conventional cemented carbide with a cermet substrate, which has a CTE closely matching that of the coating. Therefore, in this work we analyze and compare the influence of a cermet substrate on wear initiation in CVD coated tools during AISI 316Ti stainless steel turning. Two coatings were evaluated: (i) nanolayered κ-Al2O3–TiN/Ti(C,N) and (ii) (0001)-textured α-Al2O3/Ti(C,N). Both coatings were free of thermal cracks when deposited on the cermet and exhibited a compressive residual stress state. In the κ-Al2O3–TiN coating, fracture occurred between the nanolayers at 0.3 m of cutting, similar to that observed when the same coating was deposited on cemented carbide. In the α-Al2O3/Ti(C,N), the use of cermet promoted more gradual coating degradation, with cermet exposure first observed after 16 m of cutting, compared with only 1 m for the corresponding cemented carbide tool. These results indicate that suppression of thermal cracks delays wear in α-Al2O3/Ti(C,N) coatings. However, coating removal still occurred after a relatively short cutting distance (16 m) and once the coating was fully removed, the low fracture toughness of the cermet became a critical factor influencing tool wear.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cermet, CVD coating, Machining, Notch wear, Stainless steel, Tool wear
in
International Journal of Refractory Metals and Hard Materials
volume
138
article number
107751
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:105034481520
ISSN
0263-4368
DOI
10.1016/j.ijrmhm.2026.107751
language
English
LU publication?
yes
id
64d40751-501a-44e7-82ea-6dbf08b00ae3
date added to LUP
2026-04-13 11:38:37
date last changed
2026-05-19 12:44:23
@article{64d40751-501a-44e7-82ea-6dbf08b00ae3,
  abstract     = {{<p>CVD (chemical vapor deposition) coated cutting tools typically exhibit thermal cracks caused by the mismatch in coefficients of thermal expansion (CTEs) between coating and cemented carbide. These cracks act as weak points during stainless steel machining, contributing to premature tool wear. As a strategy to suppress thermal cracks formation, we investigate replacing the conventional cemented carbide with a cermet substrate, which has a CTE closely matching that of the coating. Therefore, in this work we analyze and compare the influence of a cermet substrate on wear initiation in CVD coated tools during AISI 316Ti stainless steel turning. Two coatings were evaluated: (i) nanolayered κ-Al<sub>2</sub>O<sub>3</sub>–TiN/Ti(C,N) and (ii) (0001)-textured α-Al<sub>2</sub>O<sub>3</sub>/Ti(C,N). Both coatings were free of thermal cracks when deposited on the cermet and exhibited a compressive residual stress state. In the κ-Al<sub>2</sub>O<sub>3</sub>–TiN coating, fracture occurred between the nanolayers at 0.3 m of cutting, similar to that observed when the same coating was deposited on cemented carbide. In the α-Al<sub>2</sub>O<sub>3</sub>/Ti(C,N), the use of cermet promoted more gradual coating degradation, with cermet exposure first observed after 16 m of cutting, compared with only 1 m for the corresponding cemented carbide tool. These results indicate that suppression of thermal cracks delays wear in α-Al<sub>2</sub>O<sub>3</sub>/Ti(C,N) coatings. However, coating removal still occurred after a relatively short cutting distance (16 m) and once the coating was fully removed, the low fracture toughness of the cermet became a critical factor influencing tool wear.</p>}},
  author       = {{Sirtuli, Larissa Juliana and Shoja, Siamak and Boing, Denis and Bushlya, Volodymyr and Norgren, Susanne}},
  issn         = {{0263-4368}},
  keywords     = {{Cermet; CVD coating; Machining; Notch wear; Stainless steel; Tool wear}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{International Journal of Refractory Metals and Hard Materials}},
  title        = {{Investigation of wear initiation in CVD coated cermet tools during stainless steel turning}},
  url          = {{http://dx.doi.org/10.1016/j.ijrmhm.2026.107751}},
  doi          = {{10.1016/j.ijrmhm.2026.107751}},
  volume       = {{138}},
  year         = {{2026}},
}