Please use this identifier to cite or link to this item: doi:10.22028/D291-37952
Title: Critical Assessment of Two-Dimensional Methods for the Microstructural Characterization of Cemented Carbides
Author(s): Fang, Shiqi
Salán, Núria
Pauly, Christoph
Llanes, Luis
Mücklich, Frank
Language: English
Title: Metals
Volume: 12
Issue: 11
Publisher/Platform: MDPI
Year of Publication: 2022
Free key words: cemented carbides
two-dimensional microstructural characterization
carbide grain size
phase fraction
carbide contiguity
binder mean free path
optical microscopy
DDC notations: 500 Science
Publikation type: Journal Article
Abstract: Cemented carbides, or hard metals, are ceramic–metal composites usually consisting of tungsten carbide particles bound by a cobalt-based alloy. They are the backbone materials for the tooling industry, as a direct consequence of the outstanding range of property combinations, depending on their effective microstructural assemblage, i.e., the physical dimensions and relative content of their constitutive phases. Hence, reliable microstructural characterization becomes key for hard metal grade selection and quality control. This work aimed to assess the practical twodimensional characterization methods for the most important one- and two-phase properties of cemented carbides, i.e., the carbide grain size, phase fraction, carbide contiguity, and binder mean free path. Three different methods—point, line, and area analysis—were implemented to characterize four microstructurally distinct grades. The images were acquired by optical and scanning electron microscopy, with the latter through both secondary and backscattered electrons. Results were critically discussed by comparing the obtained values of properties and the different characterization methodology. Inspection technique combinations were finally ranked based on accuracy, accessibility, and operability considerations. The line method was used to analyze all the properties, the area method, for the one-phase properties, and the point method, for only the phase fraction. It was found that the combination of optical microscopy and the line analysis method was suitable for a direct inspection and rapid estimation for carbides above fine grain size. The most precise results were achieved using line analysis of the images obtained by the backscattered electrons of the scanning electron microscope.
DOI of the first publication: 10.3390/met12111882
Link to this record: urn:nbn:de:bsz:291--ds-379524
ISSN: 2075-4701
Date of registration: 11-Nov-2022
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Dirk Bähre
NT - Prof. Dr. Frank Mücklich
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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