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Wear development of self-lubricating CrAlVN coatings during turning Ti6Al4V
Citation Link: https://doi.org/10.15480/882.4363
Publikationstyp
Journal Article
Date Issued
2021-12
Sprache
English
TORE-DOI
Journal
Start Page
70
End Page
77
Citation
21st Machining Innovations Conference for Aerospace Industry 2021 (MIC 2021): 70-77 (2021)
Contribution to Conference
Publisher DOI
Publisher
Social Science Electronic Publ.
Interactions between cutting tool and workpiece material are crucial to tool wear at the cutting edge. In particular difficult to
machine materials like the titanium alloy Ti6Al4V require tailored solutions to avoid extensive tool wear. Temperature-active, self-
lubricating chromium-aluminium-vanadium-nitride (CrAlVN) coatings deposited by physical vapor deposition (PVD) have shown
the potential to reduce tool wear during Ti6Al4V turning. These coatings form lubricating oxide phases at temperatures between
700 °C ≤ θ ≤ 800 °C which might be suitable to reduce thermal and mechanical loads during cutting. However, the initial wear
development as well as the formation of lubricating oxide phases during Ti6Al4V turning while using cooling lubricant have not
been adequately investigated. Consequentially, it is unclear whether the lubricating oxide phases form during the turning operation
with flood cooling. Nevertheless, this is of interest, because the use of cooling lubricant is state of the art in turning of Ti6Al4V in
order to reach an increased tool life. That is why, the initial tool wear within the first two minutes of turning with flood cooling
was investigated in this study. For this purpose, two different CrAlVN coatings with varying V/Al ratios were deposited on
cemented carbide inserts by a hybrid direct current magnetron sputtering (dcMS) / high power pulsed magnetron sputtering
(HPPMS) process using an industrial coating unit. Subsequently, cutting tests with a depth of cut ap = 1.2 mm, feed rate
f = 0.12 mm, setting angle κr = 95° and cutting velocity vc = 80 m/min were conducted at defined cutting intervals of tc = 5 s, 10 s,
20 s, 40 s, 80 s and 120 s using a computer numerical controlled (CNC) lathe machine. The initial tool wear development,
prevailing wear mechanisms as well as the formed oxide phases during the intervals were analyzed. Uncoated cemented carbide
inserts were used as a reference. The results highlight that the formation of lubricating vanadium oxides is possible in turning
process with cooling lubricant. Furthermore, it seems that adhesion processes are the main causes of tool failure. The results offer
the possibility to adapt the CrAlVN coatings for Ti6Al4V turning.
machine materials like the titanium alloy Ti6Al4V require tailored solutions to avoid extensive tool wear. Temperature-active, self-
lubricating chromium-aluminium-vanadium-nitride (CrAlVN) coatings deposited by physical vapor deposition (PVD) have shown
the potential to reduce tool wear during Ti6Al4V turning. These coatings form lubricating oxide phases at temperatures between
700 °C ≤ θ ≤ 800 °C which might be suitable to reduce thermal and mechanical loads during cutting. However, the initial wear
development as well as the formation of lubricating oxide phases during Ti6Al4V turning while using cooling lubricant have not
been adequately investigated. Consequentially, it is unclear whether the lubricating oxide phases form during the turning operation
with flood cooling. Nevertheless, this is of interest, because the use of cooling lubricant is state of the art in turning of Ti6Al4V in
order to reach an increased tool life. That is why, the initial tool wear within the first two minutes of turning with flood cooling
was investigated in this study. For this purpose, two different CrAlVN coatings with varying V/Al ratios were deposited on
cemented carbide inserts by a hybrid direct current magnetron sputtering (dcMS) / high power pulsed magnetron sputtering
(HPPMS) process using an industrial coating unit. Subsequently, cutting tests with a depth of cut ap = 1.2 mm, feed rate
f = 0.12 mm, setting angle κr = 95° and cutting velocity vc = 80 m/min were conducted at defined cutting intervals of tc = 5 s, 10 s,
20 s, 40 s, 80 s and 120 s using a computer numerical controlled (CNC) lathe machine. The initial tool wear development,
prevailing wear mechanisms as well as the formed oxide phases during the intervals were analyzed. Uncoated cemented carbide
inserts were used as a reference. The results highlight that the formation of lubricating vanadium oxides is possible in turning
process with cooling lubricant. Furthermore, it seems that adhesion processes are the main causes of tool failure. The results offer
the possibility to adapt the CrAlVN coatings for Ti6Al4V turning.
DDC Class
600: Technik
620: Ingenieurwissenschaften
More Funding Information
The authors gratefully acknowledge the financial support of the German Research Foundation, Deutsche Forschungs-gemeinschaft (DFG) within the research project “Unter-suchung temperaturaktiver, reibungsmindernder Schicht-systeme für die Drehbearbeitung von Titanlegierungen”, BO 1979/69-1 / HI 843/10-1, with the project number 422345568.
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