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On the wear mechanisms of uncoated and coated pcBN tools during turning of 17–4 PH martensitic stainless steel

Bjerke, A. LU orcid ; Casas, J. ; Lenrick, F. LU orcid ; Andersson, J. M. LU orcid ; M'Saoubi, R. LU and Bushlya, V. LU (2025) In International Journal of Refractory Metals and Hard Materials 127.
Abstract

Polycrystalline cubic boron nitride (pcBN) is a very promising tool material for turning martensitic stainless steels at high cutting speeds (vc > 200 m/min). The competitive advantage of pcBN over cemented carbide increases as the cutting speed is increased. Changing the speed might lead to a shift in the wear balance and hence the knowledge about tool wear below vc = 200 m/min might not be applicable at vc = 600 m/min. The coatings designed for the lower speed range might also not be performing in the same way at higher speeds. This paper investigates the wear mechanism of uncoated and (Ti,Al)N coated pcBN tools when turning 17–4 PH in a hardened condition at speeds vc = 200–600 m/min.... (More)

Polycrystalline cubic boron nitride (pcBN) is a very promising tool material for turning martensitic stainless steels at high cutting speeds (vc > 200 m/min). The competitive advantage of pcBN over cemented carbide increases as the cutting speed is increased. Changing the speed might lead to a shift in the wear balance and hence the knowledge about tool wear below vc = 200 m/min might not be applicable at vc = 600 m/min. The coatings designed for the lower speed range might also not be performing in the same way at higher speeds. This paper investigates the wear mechanism of uncoated and (Ti,Al)N coated pcBN tools when turning 17–4 PH in a hardened condition at speeds vc = 200–600 m/min. Both scanning and transmission electron microscopy are used to study the worn tools. The in-depth analysis reveals that adhesive wear is only active at low speeds. Increasing the speed does however lead to more wear by diffusion and oxidation. The cBN is preferentially worn out, leaving the TiC binder at the tool-chip interface. Oxidation results in the accelerated wear of the pcBN but also in the formation of metal oxides within the adhered build up layer. The (Ti,Al)N coating does not significantly extend the tool life within this speed range, but it suppresses the adhesive wear mechanism preventing premature tool failure.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
(Ti,Al)N coating wear turning 17–4 PH, High speed machining of 17–4 PH SAE 630 UNS S17400, PcBN tool wear during turning of 17–4 PH, TEM investigation of worn PcBN tools
in
International Journal of Refractory Metals and Hard Materials
volume
127
article number
106984
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85210537087
ISSN
0263-4368
DOI
10.1016/j.ijrmhm.2024.106984
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2024 The Author(s)
id
60fc542e-da68-4a92-8c1c-68dbde68c917
date added to LUP
2024-12-09 10:12:06
date last changed
2025-04-28 20:29:38
@article{60fc542e-da68-4a92-8c1c-68dbde68c917,
  abstract     = {{<p>Polycrystalline cubic boron nitride (pcBN) is a very promising tool material for turning martensitic stainless steels at high cutting speeds (v<sub>c</sub> &gt; 200 m/min). The competitive advantage of pcBN over cemented carbide increases as the cutting speed is increased. Changing the speed might lead to a shift in the wear balance and hence the knowledge about tool wear below v<sub>c</sub> = 200 m/min might not be applicable at v<sub>c</sub> = 600 m/min. The coatings designed for the lower speed range might also not be performing in the same way at higher speeds. This paper investigates the wear mechanism of uncoated and (Ti,Al)N coated pcBN tools when turning 17–4 PH in a hardened condition at speeds v<sub>c</sub> = 200–600 m/min. Both scanning and transmission electron microscopy are used to study the worn tools. The in-depth analysis reveals that adhesive wear is only active at low speeds. Increasing the speed does however lead to more wear by diffusion and oxidation. The cBN is preferentially worn out, leaving the TiC binder at the tool-chip interface. Oxidation results in the accelerated wear of the pcBN but also in the formation of metal oxides within the adhered build up layer. The (Ti,Al)N coating does not significantly extend the tool life within this speed range, but it suppresses the adhesive wear mechanism preventing premature tool failure.</p>}},
  author       = {{Bjerke, A. and Casas, J. and Lenrick, F. and Andersson, J. M. and M'Saoubi, R. and Bushlya, V.}},
  issn         = {{0263-4368}},
  keywords     = {{(Ti,Al)N coating wear turning 17–4 PH; High speed machining of 17–4 PH SAE 630 UNS S17400; PcBN tool wear during turning of 17–4 PH; TEM investigation of worn PcBN tools}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{International Journal of Refractory Metals and Hard Materials}},
  title        = {{On the wear mechanisms of uncoated and coated pcBN tools during turning of 17–4 PH martensitic stainless steel}},
  url          = {{http://dx.doi.org/10.1016/j.ijrmhm.2024.106984}},
  doi          = {{10.1016/j.ijrmhm.2024.106984}},
  volume       = {{127}},
  year         = {{2025}},
}