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Effect of carbon activity on microstructure evolution in WC-Ni cemented carbides
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim of this work was to systematically study how the microstructure evolution is affected by the carbon activity in WC-Ni cemented carbides. Seven WC-9.59at%Ni alloys with different carbon activity were sintered at 1500 °C. From investigating these alloys, the carbon window has been experimentally evaluated using light optical microscopy and compared to theoretical carbon window calculated using Thermo-Calc. The overall microstructure of cross sections and raw surfaces have been investigated using scanning electron microscopy. Finally, the WC grain size and distribution have been evaluated using electron backscatter diffraction.

It was found that the experimental carbon window was slightly wider than the theoretical carbon window. The WC grain size increased and the grain size distribution got wider with increasing carbon activity. In addition, the largest WC grains showed the largest grain growth by increasing carbon activity. By comparing the present results of grain size and distribution of WC-Ni to previous results of WC-Co, it was found that the WC grain growth was more pronounced and more influenced by the carbon activity.

Place, publisher, year, edition, pages
2018. , p. 72
Keywords [en]
Cemented carbides, Hard metal, WC-Ni, Tungsten carbide, Nickel binder, Grain coarsening, Grain growth, Carbon activity, Size distribution, EBSD, Electron backscattered diffraction
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-226566OAI: oai:DiVA.org:kth-226566DiVA, id: diva2:1199370
External cooperation
Sandvik Mining and Rock Technology
Subject / course
Physical Metallurgy
Educational program
Master of Science in Engineering - Materials Design and Engineering
Presentation
2018-04-03, Västberga, 10:11 (English)
Supervisors
Examiners
Available from: 2018-04-23 Created: 2018-04-20 Last updated: 2018-07-10Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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