Investigation of the Wear Behavior of PVD Coated Carbide Tools during Ti6Al4V Machining with Intensive Built Up Edge Formation

Tool wear phenomena during the machining of titanium alloys are very complex. Severe adhesive interaction at the tool chip interface, especially at low cutting speeds, leads to intensive Built Up Edge (BUE) formation. Additionally, a high cutting temperature causes rapid wear in the carbide inserts...

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Bibliographic Details
Published inCoatings (Basel) Vol. 11; no. 3; p. 266
Main Authors Chowdhury, M.S.I., Bose, B., Rawal, S., Fox-Rabinovich, G.S., Veldhuis, S.C.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2021
Subjects
Adhesive wear
Built up edge
Carbide tools
Coatings
Cutting parameters
Cutting speed
Cutting tools
Cutting wear
High temperature
Inserts
Morphology
Protective coatings
Research methodology
Residual stress
Spectrum analysis
Strain hardening
Thermal conductivity
Titanium alloys
Titanium base alloys
Tool wear
Tribology
Turning (machining)
X-rays
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Summary:Tool wear phenomena during the machining of titanium alloys are very complex. Severe adhesive interaction at the tool chip interface, especially at low cutting speeds, leads to intensive Built Up Edge (BUE) formation. Additionally, a high cutting temperature causes rapid wear in the carbide inserts due to the low thermal conductivity of titanium alloys. The current research studies the effect of AlTiN and CrN PVD coatings deposited on cutting tools during the rough turning of a Ti6Al4V alloy with severe BUE formation. Tool wear characteristics were evaluated in detail using a Scanning Electron Microscope (SEM) and volumetric wear measurements. Chip morphology analysis was conducted to assess the in situ tribological performance of the coatings. A high temperature–heavy load tribometer that mimics machining conditions was used to analyze the frictional behavior of the coatings. The micromechanical properties of the coatings were also investigated to gain a better understanding of the coating performance. It was demonstrated that the CrN coating possess unique micromechanical properties and tribological adaptive characteristics that minimize BUE formation and significantly improve tool performance during the machining of the Ti6Al4V alloy.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings11030266