Influence of Co-enriched surface zones in cemented carbides on the microstructure and mechanical properties of TiN/TiC0.6N0.4/ α-Al2O3 coatings
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in: International journal of refractory metals & hard materials, Jahrgang 110.2023, Nr. January, 106025, 01.2023.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Influence of Co-enriched surface zones in cemented carbides on the microstructure and mechanical properties of TiN/TiC0.6N0.4/ α-Al2O3 coatings
AU - Konstantiniuk, Fabian
AU - Krobath, Martin
AU - Ecker, Werner
AU - Tkadletz, Michael
AU - Czettl, Christoph
AU - Schalk, Nina
N1 - Publisher Copyright: © 2022 Elsevier Ltd
PY - 2023/1
Y1 - 2023/1
N2 - In metal cutting applications functionally graded near-surface zones in cemented carbide substrates are applied to optimize their properties, in particular toughness and hardness. Thus, the present work focuses on the influence of Co-enriched substrate surface zones and their thickness on the microstructure and mechanical properties of state-of-the-art TiN/TiC 0.6N 0.4/α-Al 2O 3 coatings synthesized using chemical vapor deposition. Complementary cross-sectional energy dispersive X-ray spectroscopy and electron back-scatter diffraction maps provided insight into the grain size, preferred orientation and phase composition of coatings and substrates. While the hardness and Young's modulus of the coatings were hardly affected by the Co-enriched surface zone and its thickness, nanoindentation maps performed on the cross-sections of the substrates confirmed a lower hardness and Young's modulus in zones with higher Co content. Furthermore, it was found that the Co-enriched surface zone and its thickness have no effect on the thermal crack networks of the coatings. Rockwell-indentation tests demonstrated a reduction of the coating adhesion with increasing thickness of the Co-enriched surface zone. As determined by X-Ray diffraction, the tensile residual stress in both, the TiC 0.6N 0.4 and α-Al 2O 3, decreased with increasing thickness of the Co-enriched surface zone. Complementary finite element method simulations have shown that plastic deformation due to creep in the substrate and the Co-enriched surface zone only has a minor influence on the residual stress in the coating. The results obtained within this work contribute to a better understanding of the influence of a Co-enriched surface zone and its thickness on the performance of TiN/TiC 0.6N 0.4/α-Al 2O 3 coated cutting tools.
AB - In metal cutting applications functionally graded near-surface zones in cemented carbide substrates are applied to optimize their properties, in particular toughness and hardness. Thus, the present work focuses on the influence of Co-enriched substrate surface zones and their thickness on the microstructure and mechanical properties of state-of-the-art TiN/TiC 0.6N 0.4/α-Al 2O 3 coatings synthesized using chemical vapor deposition. Complementary cross-sectional energy dispersive X-ray spectroscopy and electron back-scatter diffraction maps provided insight into the grain size, preferred orientation and phase composition of coatings and substrates. While the hardness and Young's modulus of the coatings were hardly affected by the Co-enriched surface zone and its thickness, nanoindentation maps performed on the cross-sections of the substrates confirmed a lower hardness and Young's modulus in zones with higher Co content. Furthermore, it was found that the Co-enriched surface zone and its thickness have no effect on the thermal crack networks of the coatings. Rockwell-indentation tests demonstrated a reduction of the coating adhesion with increasing thickness of the Co-enriched surface zone. As determined by X-Ray diffraction, the tensile residual stress in both, the TiC 0.6N 0.4 and α-Al 2O 3, decreased with increasing thickness of the Co-enriched surface zone. Complementary finite element method simulations have shown that plastic deformation due to creep in the substrate and the Co-enriched surface zone only has a minor influence on the residual stress in the coating. The results obtained within this work contribute to a better understanding of the influence of a Co-enriched surface zone and its thickness on the performance of TiN/TiC 0.6N 0.4/α-Al 2O 3 coated cutting tools.
KW - CVD
KW - EBSD
KW - Graded cemented carbides
KW - TiCN
KW - α-Al2O3
UR - http://www.scopus.com/inward/record.url?scp=85140433475&partnerID=8YFLogxK
U2 - 10.1016/j.ijrmhm.2022.106025
DO - 10.1016/j.ijrmhm.2022.106025
M3 - Article
VL - 110.2023
JO - International journal of refractory metals & hard materials
JF - International journal of refractory metals & hard materials
SN - 0263-4368
IS - January
M1 - 106025
ER -