FEMS EUROMAT 2023
Lecture
04.09.2023
Study of the deformation and creep properties of “Green Carbide” WC-Co hardmetals at elevated temperature
KM

Dr. Kathrin Maier

Materials Center Leoben Forschung GmbH

Maier, K. (Speaker)¹; Klünsner, T.¹; Marsoner, S.¹; Pachlhofer, J.²; Weirather, T.²; Czettl, C.²
¹Materials Center Leoben Forschung GmbH; ²CERATIZIT Austria GmbH, Reutte (Austria)
Vorschau
19 Min. Untertitel (CC)

The production of metalworking tools made of WC-Co hardmetal requires tungsten (W) and cobalt (Co) as raw materials. These metals are categorized as "critical raw materials" associated with issues in terms of price, availability, and environmental footprint. Therefore, recycling hardmetal scrap is becoming increasingly important to limit the use of Co and W from primary metallurgy. Furthermore, applying metalworking tools made of 100% recycled materials requires the same properties as state-of-the-art tools to achieve the same performance. In the current work, static compression and step-loading creep tests were performed to investigate the creep and plastic deformation properties of “Green Carbide” and “state-of-the-art” WC-Co hardmetals. The term "Green Carbide" refers to grades consisting of nearly 100% high-quality secondary raw materials and "state-of-the-art" refers to hardmetals that are manufactured according to the current state of the technology and also contain a certain amount of recycled material. The investigated hardmetal samples were made out of 10 wt.% Co-binder and an average WC grain size of 0.7 µm. Experiments were conducted with a servo-hydraulic test machine under vacuum and uniaxial loading conditions at room temperature up to 900°C. Microstructure analyses were performed on argon ion polished surfaces using scanning electron microscopy. Experiments showed that the “Green Carbide” and the “state-of-the-art” hardmetals exhibit very similar deformation behavior under monotonically increasing compression load. The creep behavior of the investigated hardmetals was also similar. Additionally, experiments have shown that the loading direction influences the creep behavior of both hardmetal grades. Initial results show that "Green Carbide" combines the performance as well as the quality of the "state-of-the-art" hardmetal grade under monotonically increasing loads and creep loads with focused, sustainable production.

Abstract

Abstract

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