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    Cutting performance improvement of MTCVD coated cemented carbide inserts via appropriate heat treatment
    (Elsevier, 2020) Skordaris, Georgios; Bouzakis, Konstantinos Dionysios; Stergioudi, Fani; Kouparanis, Stefanos; Boumpakis, Apostolos; Bouzakis, A.
    The softening of cemented carbide at the elevated temperature of MTCVD processes results in significant reduction of their strength, and thus, high coating deformation during cutting. In this way, at interrupted cutting loads, as during turning cast iron, the cutting performance of MTCVD coated cemented carbide inserts degrades due to premature coating fatigue fracture. To overcome this problem, appropriate heat treatments of MTCVD coated inserts were conducted. The related temperatures and durations for improving the substrate properties were optimized considering obtained strength data of uncoated inserts variously heat treated and the turning performance of coated ones correspondingly heat treated. (C) 2020 CIRP. Published by Elsevier Ltd. All rights reserved.
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    Effect of the crystallinity of diamond coatings on cemented carbide inserts on their cutting performance in milling
    (Elsevier Science Bv, 2019) Skordaris, Georgios; Bouzakis, Konstantinos Dionysios; Kotsanis, Tilemachos; Boumpakis, Apostolos; Stergioudi, Fani; Christofilos, Dimitrios; Woda, M.
    Micro-crystalline diamond (MCD) coatings were deposited on cemented carbide inserts at different temperatures using hot filament chemical vapor deposition technique. For investigating the effect of the developed diamond crystallinity on the fatigue strength and wear behaviour of the prepared MCD coated inserts, inclined impact tests and milling investigations were conducted correspondingly. Raman spectra were recorded for capturing the crystalline phases after the film deposition and their potential changes after the impact and milling experiments induced by the mechanical and thermal loads. Thus, the explanation of the cutting performance of the employed diamond coated inserts with various crystalline phases was enabled. (C) 2019 Published by Elsevier Ltd on behalf of CIRP.
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    Stress, strain and strain-rate cemented carbide properties determined with a fem-supported evaluation of impact test imprints
    (Elsevier Sci Ltd, 2021) Bouzakis, Antonios; Skordaris, Georgios; Bouzakis, Konstantinos Dionysios; Gökçen, Mehmet Gökhan; Boumpakis, Apostolos; Batuk, Ahmet Uğur; Şişman, Süleyman
    Cemented carbide materials are key in tool manufacturing, nowadays widely used in cutting, forming and other manufacturing processes. Commonly applied methods for obtaining their strain-rate dependent material properties are insufficient due to the high hardness, mechanical strength and low deformability. In this paper, we produce relevant data for stress-strain and strain-rate curves up to strain rates of approximately 200 s(-1) with the aid of a developed FEM-supported evaluation method for remaining imprints on cemented carbide surfaces after applying impact loads at various durations and magnitudes. Regarding the impact duration, the impact loads were dynamically generated via electromagnetic or piezoelectric devices. The attained data are relevant to several applications including calculations to determine the stress and strain fields developed in cemented carbide tools imposed by impact loads at various conditions.