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Microstructure investigations of WC-Co cemented carbide containing Eta-phase and Cr
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2018 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Cemented carbide containing sub carbide phases, M6C and M12C, known as eta-phase, increases the lifetime milling cutters due to increased resistance to comb cracks. When milling, the inserts much sustain high temperatures, meaning edgeline toughness and thermal fatigue resistance are needed. To obtain this, finer grains and higher binder content are needed.

In this study, WC-Co cemented carbides with eta-phase and Cr as well as a higher binder content are investigated. The microstructure is the focus, with parameters such as eta-phase particle size and volume fraction, WC grain size being evaluated. Another part of the study is the investigate the effect of Cr on heat treatment.

The addition of Cr in a WC-Co cemented carbide with eta-phase has shown to give rise to smaller eta-phase particle sizes and WC grain size as compared to without Cr. Also, increasing the volume fraction of eta-phase has less influence on WC and eta-phase particle size.

Heat treated samples without Cr is shown to increase the coercivity of the samples at 700 degrees Celsius, without change in WC grain size. The effect is also leading to an increase in hardness. But with addition of Cr, the effect seems to diminish.

Place, publisher, year, edition, pages
2018. , p. 51
Series
UPTEC Q, ISSN 1401-5773 ; 18024
Keywords [en]
Cemented carbide, Eta-phase, Chromium, Material characterization
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:uu:diva-356823OAI: oai:DiVA.org:uu-356823DiVA, id: diva2:1237216
External cooperation
Sandvik Coromant
Educational program
Master Programme in Materials Engineering
Supervisors
Examiners
Available from: 2018-08-08 Created: 2018-08-07 Last updated: 2018-08-08Bibliographically approved

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