首页|Contact fatigue behaviour of CVD coated cemented carbides in dry and wet conditions
Contact fatigue behaviour of CVD coated cemented carbides in dry and wet conditions
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NSTL
Elsevier
Cycling contact fatigue indentation tests in dry and wet conditions were conducted in cemented carbides CVD-coated with Ti(C,N)/α-Al2O3 and Zr(C,N)/α-Al2O3 systems. In dry contact experiments, all imprints presented a deformed area where the coating was still present after the test. Formation of cracks was visible at the edge of the contact point of the imprint. On the other hand, under wet conditions, almost all imprints presented a ring where the α-Al2O3 had been removed, driven by a corrosion-fatigue process. Exceptionally, for Cr-containing cemented carbides combined with Zr(C,N)/α-Al2O3 coating, no delamination of α-Al2O3 was observed after the test under wet conditions. This result suggests that the combination of fine-grained cemented carbides and coating systems with low coefficient of thermal expansion may be of advantage to resist degradation by cyclic contact fatigue. Furthermore, the response to fatigue by contact loads can be enhanced by tailoring/combining cemented carbides and CVD coating systems which present higher chemical stability, and both higher intrinsic plasticity and resistance to plastic deformation.
Universidad Tecnológica Nacional Facultad Regional Concepción del Uruguay
INTEMA (Universidad Nacional de Mar del Plata -CONICET) Mar del Plata
CIEFMA-Department of Materials Science Universitat Politècnica de Catalunya-Barcelona Tech EEBE & Barcelona Research Center in Multiscale Science and Engineering Universitat Politècnica de Catalunya-Barcelona Tech
Functional Materials Department of Materials Science Saarland University
NSTL
Elsevier
