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Mechanical and Thermophysical Properties of Hardmetals at Room and Elevated Temperatures

Mechanische und thermophysikalische Eigenschaften von Hartmetallen bei Raumtemperatur und erhöhten Temperaturen
: Vornberger, Anne; Pötschke, Johannes; Gestrich, Tim; Herrmann, Mathias

Fulltext urn:nbn:de:0011-n-5723539 (274 KByte PDF)
MD5 Fingerprint: 9a992577981c3ce22f4c5ee6d63f5099
Created on: 16.1.2020

European Powder Metallurgy Association -EPMA-:
Euro PM2018 Proceedings : 14 – 18 October 2018, Bilbao, Spain
Shrewsbury: EPMA, 2018
ISBN: 978-1-899072-50-7
6 pp.
International Powder Metallurgy Congress and Exhibition (Euro PM) <2018, Bilbao>
Deutsche Forschungsgemeinschaft DFG
HE 2457/21-1
Grundlagen zur substratspezifischen Gestaltung der Schneidkante
Conference Paper, Electronic Publication
Fraunhofer IKTS ()
hardmetal; cemented carbide; WC-Co; mechanical properties; thermophysical properties

Hardmetals or cemented carbides are a widely-used material in cutting applications. To reach maximum efficiency in the cutting process the choice of the proper hardmetal grade is crucial. Often the selection is solely based on mechanical properties such as hardness and fracture toughness while in some cutting applications the selection should also be based on the thermal conductivity too. Thus, for cutting applications both mechanical and thermophysical properties are equally important. In this study different WC-Co hardmetals with the same nominal hardness at room temperature were fabricated by varying both WC grain sizes from nanoscaled to coarse and metallic (Co) binder contents. Hardness and thermal conductivity were determined in the range from room temperature up to 900 °C. Results show significant differences in thermal diffusivity and high temperature hardness of the materials with the same room temperature hardness. The influence of the microstructure on these properties will be discussed. While both mechanical as well as thermophysical properties of hardmetals have been studied separately before, a systematic study of both properties at once is missing. This study presents first results of both hardness and thermal diffusivity measurements as a function of WC grain size, metallic binder content and temperature.