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Scratch adhesion characteristics of PVD TiAlN deposited on high speed steel, cemented carbide and PCBN substrates
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology. Dalarna University, Falun, Sweden.
Seco Tools AB, Fagersta, Sweden.
Seco Tools AB, Fagersta, Sweden.
Dalarna University, Falun, Sweden.
2013 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 308, no 1-2, 133-141 p.Article in journal (Refereed) Published
Abstract [en]

Modern tool materials, ranging from powder metallurgical high speed steel to super hard materials such as polycrystalline cubic boron nitride and diamond, are used as cutting tools in the metal cutting industry. In order to further improve the cutting performance, these tools are frequently coated by thin, hard PVD coatings such as TiN, TiAlN, AlCrO3, etc. In order to develop and design new PVD coatings it is important to characterize the mechanical properties of the coatings and understand the coating/ substrate deformation mechanisms in a tribological contact, e.g. metal cutting. For example, it is important to be aware that the mechanical properties of the substrate (tool material) have a significant impact on the practical coating adhesion and the coating failure mechanisms.

In the present study scratch testing has been used in order to evaluate to increase the understanding of the mechanical response and potential coating failure modes of cathodic arc evaporated TiAlN deposited on high speed steel, cemented carbide and polycrystalline cubic boron nitride. Post-test characterization of the scratched samples using optical profilometry, scanning electron microscopy and energy dispersive X-ray spectroscopy were performed and the cohesive and adhesive surface failure mechanisms are described and related to the substrate material properties. The results clearly show that, although all substrate materials can be regarded as hard, they result in completely different coating failure mechanisms at the normal load corresponding to substrate exposure. Also, coating failure resulting in substrate exposure does not necessarily correspond to interfacial cracking resulting in adhesive fracture along the coating–substrate interface.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 308, no 1-2, 133-141 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-102543DOI: 10.1016/j.wear.2013.08.025ISI: 000330910900017OAI: oai:DiVA.org:liu-102543DiVA: diva2:678955
Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Wear of coated and uncoated PCBN cutting tool used in turning and milling
Open this publication in new window or tab >>Wear of coated and uncoated PCBN cutting tool used in turning and milling
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This licentiate thesis has the main focus on evaluation of the wear of coated and uncoated polycrystalline cubic boron nitride cutting tool used in cutting operations against hardened steel. And to exam the surface finish and integrity of the work material used. Harder work material, higher cutting speed and cost reductions result in the development of harder and more wear resistance cutting tools. Although PCBN cutting tools have been used in over 30 years, little work have been done on PVD coated PCBN cutting tools. Therefore hard turning and hard milling experiments with PVD coated and uncoated cutting tools have been performed and evaluated. The coatings used in the present study are TiSiN and TiAlN. The wear scar and surface integrity have been examined with help of several different characterization techniques, for example scanning electron microscopy and Auger electron spectroscopy.

 

The results showed that the PCBN cutting tools used displayed crater wear, flank wear and edge micro chipping. While the influence of the coating on the crater and flank wear was very small and the coating showed a high tendency to spalling. Scratch testing of coated PCBN showed that, the TiAlN coating resulted in major adhesive fractures. This displays the importance of understanding the effect of different types of lapping/grinding processes in the pre-treatment of hard and super hard substrate materials and the amount and type of damage that they can create. For the cutting tools used in turning, patches of a adhered layer, mainly consisting of FexOy were shown at both the crater and flank. And for the cutting tools used in milling a tribofilm consisting of SixOy covered the crater. A combination of tribochemical reactions, adhesive wear and mild abrasive wear is believed to control the flank and crater wear of the PCBN cutting tools. On a microscopic scale the difference phases of the PCBN cutting tool used in turning showed different wear characteristics. The machined surface of the work material showed a smooth surface with a Ra-value in the range of 100-200 nm for the turned surface and 100-150 nm for the milled surface. With increasing crater and flank wear in combination with edge chipping the machined surface becomes rougher and showed a higher Ra-value. For the cutting tools used in milling the tendency to micro edge chipping was significant higher when milling the tools steels showing a higher hard phase content and a lower heat conductivity resulting in higher mechanical and thermal stresses at the cutting edge.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. 39 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1634
Keyword
PCBN, PVD coating, Wear mechanisms, Tool wear, Metal cutting
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-102551 (URN)10.3384/lic.diva-102551 (DOI)LIU-TEK-LIC-2013:68 (Local ID)978-91-7519-443-1 (ISBN)LIU-TEK-LIC-2013:68 (Archive number)LIU-TEK-LIC-2013:68 (OAI)
Presentation
2014-01-17, Högskolan i Dalarna, Borlänge, 13:15 (Swedish)
Opponent
Supervisors
Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2015-06-01Bibliographically approved

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Sveen, Susanne

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