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Wear mechanisms of PcBN tools when machining AISI 316L

Persson, Henrik LU ; Lenrick, Filip LU orcid ; Franca, Luiz ; Ståhl, Jan Eric LU and Bushlya, Volodymyr LU (2021) In Ceramics International 47(22). p.31894-31906
Abstract

This paper investigates the machinability of AISI 316L stainless steel without and with NMI treatment, when machined with three different PcBN tool grades: low cBN content (50% vol.), medium (65% vol.) and high (90% vol.). The NMI treatment consisted of resulfurized and Ca-treated steels with two different Si/Al ratio. The tool materials were evaluated in terms of tool life, showing the best performance for the medium cBN content grade. Results showed that the crater wear has a more significant effect on the tool performance than the standard wear criteria of maximum flank wear. The worn tools were examined using scanning electron microscopy (SEM), focused ion beam (FIB) and transmission electron microscopy (TEM). In most cases, the... (More)

This paper investigates the machinability of AISI 316L stainless steel without and with NMI treatment, when machined with three different PcBN tool grades: low cBN content (50% vol.), medium (65% vol.) and high (90% vol.). The NMI treatment consisted of resulfurized and Ca-treated steels with two different Si/Al ratio. The tool materials were evaluated in terms of tool life, showing the best performance for the medium cBN content grade. Results showed that the crater wear has a more significant effect on the tool performance than the standard wear criteria of maximum flank wear. The worn tools were examined using scanning electron microscopy (SEM), focused ion beam (FIB) and transmission electron microscopy (TEM). In most cases, the crater exhibited three distinct regions from the edge to the end of the contact zone: the plateau, middle crater, and the upper region. Plateau and crater region displayed tool protective layer (TPL), consisting mostly of Al, Si, Mg and Ca-oxides; and some dimples in the tool from preferential wear of cBN grains. In the upper region of the best performing material, a ~1.5 μm thick TPL of mostly MnCr2O4 spinel was found, a result of the transfer of Mn- and Cr-rich oxide NMIs found in this material or oxidation of workpiece material, during the machining process.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
316L, Austenitic stainless steel, cBN, Machining, None-metallic inclusions
in
Ceramics International
volume
47
issue
22
pages
31894 - 31906
publisher
Elsevier
external identifiers
  • scopus:85113346836
ISSN
0272-8842
DOI
10.1016/j.ceramint.2021.08.075
language
English
LU publication?
yes
additional info
Funding Information: The authors would like to give thanks to Lund NanoLab, providing high quality equipment for FIB/SEM in this study, and the Sustainable Production Initiative, a cooperation between Lund University and Chalmers University of Technology. The collaboration and support from Element Six Group during this research is greatly appreciated. Publisher Copyright: © 2021 The Authors Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
id
3d202d8e-45ae-49ef-b5b0-188790aa9aaa
date added to LUP
2021-09-03 10:10:01
date last changed
2024-03-08 16:53:16
@article{3d202d8e-45ae-49ef-b5b0-188790aa9aaa,
  abstract     = {{<p>This paper investigates the machinability of AISI 316L stainless steel without and with NMI treatment, when machined with three different PcBN tool grades: low cBN content (50% vol.), medium (65% vol.) and high (90% vol.). The NMI treatment consisted of resulfurized and Ca-treated steels with two different Si/Al ratio. The tool materials were evaluated in terms of tool life, showing the best performance for the medium cBN content grade. Results showed that the crater wear has a more significant effect on the tool performance than the standard wear criteria of maximum flank wear. The worn tools were examined using scanning electron microscopy (SEM), focused ion beam (FIB) and transmission electron microscopy (TEM). In most cases, the crater exhibited three distinct regions from the edge to the end of the contact zone: the plateau, middle crater, and the upper region. Plateau and crater region displayed tool protective layer (TPL), consisting mostly of Al, Si, Mg and Ca-oxides; and some dimples in the tool from preferential wear of cBN grains. In the upper region of the best performing material, a ~1.5 μm thick TPL of mostly MnCr<sub>2</sub>O<sub>4</sub> spinel was found, a result of the transfer of Mn- and Cr-rich oxide NMIs found in this material or oxidation of workpiece material, during the machining process.</p>}},
  author       = {{Persson, Henrik and Lenrick, Filip and Franca, Luiz and Ståhl, Jan Eric and Bushlya, Volodymyr}},
  issn         = {{0272-8842}},
  keywords     = {{316L; Austenitic stainless steel; cBN; Machining; None-metallic inclusions}},
  language     = {{eng}},
  number       = {{22}},
  pages        = {{31894--31906}},
  publisher    = {{Elsevier}},
  series       = {{Ceramics International}},
  title        = {{Wear mechanisms of PcBN tools when machining AISI 316L}},
  url          = {{http://dx.doi.org/10.1016/j.ceramint.2021.08.075}},
  doi          = {{10.1016/j.ceramint.2021.08.075}},
  volume       = {{47}},
  year         = {{2021}},
}