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Henrik Persson
Adjungerad universitetsadjunkt
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Wear mechanisms of PcBN tools when machining AISI 316L
Författare
Summary, in English
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.
Avdelning/ar
- Nätkurslärare
- Distans- o uppdragsutbildning
- SPI: Sustainable Production Initiative
- Industriell Produktion
Publiceringsår
2021
Språk
Engelska
Sidor
31894-31906
Publikation/Tidskrift/Serie
Ceramics International
Volym
47
Issue
22
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Manufacturing, Surface and Joining Technology
- Metallurgy and Metallic Materials
Nyckelord
- 316L
- Austenitic stainless steel
- cBN
- Machining
- None-metallic inclusions
Aktiv
Published
ISBN/ISSN/Övrigt
- ISSN: 0272-8842