Pressure and temperature effects on the decomposition of arc evaporated Ti0.6Al0.4N coatings in continuous turning

The isostructural decomposition of arc evaporated Ti0.6Al0.4N coatings at elevated temperatures and high stresses occurring during metal cutting has been studied. Comparisons are made with short time (t=10min) anneals at temperatures typical for steel turning operations. The evolution of the spinoda...

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Bibliographic Details
Published in:Surface & coatings technology 2012-09, Vol.209, p.203-207
Main Authors: Norrby, N., Johansson, M.P., M'Saoubi, R., Odén, M.
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Coatings
Cross-disciplinary physics: materials science
rheology
Cutting
Decomposition
Exact sciences and technology
High stresses
Materials science
Metal cutting
Metals. Metallurgy
Physics
Production techniques
Spinodal decomposition
Stresses
Surface treatment
Surface treatments
Turning
Turning (machining)
Wavelengths
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Summary:The isostructural decomposition of arc evaporated Ti0.6Al0.4N coatings at elevated temperatures and high stresses occurring during metal cutting has been studied. Comparisons are made with short time (t=10min) anneals at temperatures typical for steel turning operations. The evolution of the spinodal wavelengths is studied by analytical transmission electron microscopy from samples originating from the rake face. Temperature and force measurements during turning allowed for separation of the effects of the temperature and stresses on wavelength evolution. The results show a peak temperature of around 900°C and a peak normal stress of around 2GPa during cutting. The overall wavelength is longer after cutting compared to the annealed sample at the same temperature. The results suggest that pressures generated during cutting promote coherent isostructural decomposition which is in line with theoretical studies but for considerably higher pressures. ► Cutting stresses in the GPa region are measured during turning. ► An ongoing spinodal decomposition of TiAlN is reported after machining. ► The spinodal decomposition of TiAlN is promoted by the high cutting stresses.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2012.08.068