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Experimental and theoretical study of the microscopic crater wear mechanism in titanium machining
Sandvik Coromant R&D, Sweden.
Sandvik Coromant R&D, Sweden.
Sandvik Coromant R&D, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2017 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 376, 115-124 p.Article in journal (Refereed) Published
Abstract [en]

Continuous turning of Ti6AI4V with uncoated WC-Co cutting tool inserts mainly results in crater wear on the rake face of the tool. The crater is located close to the cutting edge and increases in size with increased time in cut. The flank wear remains minor until the point when the crater reaches a critical size so that the edge deforms plastically and edge breakage occurs. To understand the crater wear degradation mechanisms, this study focuses on examining the worn tool at different stages, using both experimental and theoretical techniques, as well as under static and dynamic conditions. A layer of adhered work-piece material is observed in the crater. The present study shows both experimental and theoretical evidence of carbon depletion of the WC in the crater and formation of W (bcc) at the interface during wet continuous longitudinal turning of Ti6AI4V. This has been demonstrated for the first time. In addition, indications of a carbon rich compound, possibly MC, where M=Ti, V and W, are also observed. These observations are verified by simulation of the diffusion process. Furthermore, diffusion simulations indicate that a liquid may form at the tool/chip interface in the crater zone during machining. Turning is a dynamic process, however, to study the chemical driving forces in this system under static conditions, a means of verification of which phases will form is needed. Therefore, a diffusion couple consisting of the same materials is prepared and analyzed. Similar results are obtained for the diffusion couple as for the worn tool, indicating that the chemical wear is an important degradation parameter. The diffusion couple results are also compared to a numerical simulation of the diffusion process.

Place, publisher, year, edition, pages
2017. Vol. 376, 115-124 p.
Keyword [en]
Ti6Al4V, Turning, Craterwear, Tungsten, X-ray Diffraction, Diffusion simulations
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-329129DOI: 10.1016/j.wear.2017.01.104ISI: 000403904000016OAI: oai:DiVA.org:uu-329129DiVA: diva2:1148916
Conference
21st International Conference on Wear of Materials (WOM), MAR 26-30, 2017, Long Beach, CA
Available from: 2017-10-12 Created: 2017-10-12 Last updated: 2017-10-12Bibliographically approved

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