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Study of initial notch wear during turning of stainless steel with CVD Al2O3/Ti(C,N) coated cemented carbide tools

Sirtuli, Larissa Juliana LU orcid ; Boing, Denis ; Bushlya, Volodymyr LU and Norgren, Susanne LU (2025) In International Journal of Refractory Metals and Hard Materials 129.
Abstract

Notch wear often determines tool life when machining stainless steel. Chemical Vapour Deposited (CVD) Al2O3/Ti(C,N) coated cemented carbide tools are the first recommendation for turning of stainless steel. The CVD coating plays a vital role in reducing and delaying tool wear progress. Hence, it is essential to understand the interaction between the initiation of notch wear and the coating degradation. However, most publications have focused on studying the progression of notch wear rather than the initiation of notch. Thus, this work investigates the initial notch wear in two fundamentally different alumina-based CVD coatings. The first coating system is composed of κ-Al2O3 multilayers... (More)

Notch wear often determines tool life when machining stainless steel. Chemical Vapour Deposited (CVD) Al2O3/Ti(C,N) coated cemented carbide tools are the first recommendation for turning of stainless steel. The CVD coating plays a vital role in reducing and delaying tool wear progress. Hence, it is essential to understand the interaction between the initiation of notch wear and the coating degradation. However, most publications have focused on studying the progression of notch wear rather than the initiation of notch. Thus, this work investigates the initial notch wear in two fundamentally different alumina-based CVD coatings. The first coating system is composed of κ-Al2O3 multilayers separated by thin TiN layers. The second coating system is a solid layer of textured (0001) α-Al2O3. Both coatings have a Ti(C,N) underlayer. The coated WC-Co cutting tools were assessed from 0.3 to 16 m of face turning in AISI 316Ti. The results showed that the notch wear started already at 0.3 m (equal to 0.3 s) of engagement length in the multilayer κ-Al2O3-TiN/Ti(C,N) coated tool and at 1 m (1 s) in the textured α-Al2O3/Ti(C,N) coated tool. The wear marks show signs of substantial mechanical and/or thermal loads in the notch region already after the first centimetres in cut. The initial notch wear occurred as a coating brittle fracture. Adhered stainless steel on the tools suggests that adhesion contributed to initial notch wear. The results of this work promote a better understanding and problem formulation of the fundamental mechanism of notch wear formation when using CVD-coated tools in stainless steel turning.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Al2O3 coating, CVD coating, Machining, Notch wear, Stainless steel, Tool wear
in
International Journal of Refractory Metals and Hard Materials
volume
129
article number
107116
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85218110049
ISSN
0263-4368
DOI
10.1016/j.ijrmhm.2025.107116
language
English
LU publication?
yes
id
8aa2a34c-8d0c-424f-8fe0-f71389c52dba
date added to LUP
2025-03-03 20:21:54
date last changed
2025-04-04 14:50:24
@article{8aa2a34c-8d0c-424f-8fe0-f71389c52dba,
  abstract     = {{<p>Notch wear often determines tool life when machining stainless steel. Chemical Vapour Deposited (CVD) Al<sub>2</sub>O<sub>3</sub>/Ti(C,N) coated cemented carbide tools are the first recommendation for turning of stainless steel. The CVD coating plays a vital role in reducing and delaying tool wear progress. Hence, it is essential to understand the interaction between the initiation of notch wear and the coating degradation. However, most publications have focused on studying the progression of notch wear rather than the initiation of notch. Thus, this work investigates the initial notch wear in two fundamentally different alumina-based CVD coatings. The first coating system is composed of κ-Al<sub>2</sub>O<sub>3</sub> multilayers separated by thin TiN layers. The second coating system is a solid layer of textured (0001) α-Al<sub>2</sub>O<sub>3</sub>. Both coatings have a Ti(C,N) underlayer. The coated WC-Co cutting tools were assessed from 0.3 to 16 m of face turning in AISI 316Ti. The results showed that the notch wear started already at 0.3 m (equal to 0.3 s) of engagement length in the multilayer κ-Al<sub>2</sub>O<sub>3</sub>-TiN/Ti(C,N) coated tool and at 1 m (1 s) in the textured α-Al<sub>2</sub>O<sub>3</sub>/Ti(C,N) coated tool. The wear marks show signs of substantial mechanical and/or thermal loads in the notch region already after the first centimetres in cut. The initial notch wear occurred as a coating brittle fracture. Adhered stainless steel on the tools suggests that adhesion contributed to initial notch wear. The results of this work promote a better understanding and problem formulation of the fundamental mechanism of notch wear formation when using CVD-coated tools in stainless steel turning.</p>}},
  author       = {{Sirtuli, Larissa Juliana and Boing, Denis and Bushlya, Volodymyr and Norgren, Susanne}},
  issn         = {{0263-4368}},
  keywords     = {{Al2O3 coating; CVD coating; Machining; Notch wear; Stainless steel; Tool wear}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{International Journal of Refractory Metals and Hard Materials}},
  title        = {{Study of initial notch wear during turning of stainless steel with CVD Al<sub>2</sub>O<sub>3</sub>/Ti(C,N) coated cemented carbide tools}},
  url          = {{http://dx.doi.org/10.1016/j.ijrmhm.2025.107116}},
  doi          = {{10.1016/j.ijrmhm.2025.107116}},
  volume       = {{129}},
  year         = {{2025}},
}