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Effect of microstructure on the properties of pulse current sintered bimodal hardmetals
Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.ORCID iD: 0000-0003-4888-6237
Department of Metallurgical and Materials Engineering, University of Engineering and Technology, Lahore.
2008 (English)In: Proceedings of the 7th International Conference on Tungsten, Refractory and Hardmaterials, 2008, p. 41-48Conference paper, Published paper (Refereed)
Abstract [en]

This study deals with the pulse current processing, microstructure and mechanical properties of WC-20wt%(W,Ti,Ta)C-6wt%Co cemented carbides. The conventional WC particles of 4μm size and ultrafine particles of 200nm were introduced in the system with varying ratio to synthesize bimodal hardmetals. Pulse current processing effectively controlled the grain size of WC particles in the presence of (W,Ti,Ta)C phase to synthesize fine microstructure. The microstructure of pulse current consolidated hardmetals was sensitive to the ratio of conventional WC particles to ultrafine WC particles. The ratio of conventional WC particles to ultrafine WC particles was very effective to enhance the mechanical properties of bimodal hardmetals. Hardness of bimodal hardmetals increased with decrease in the ratio of conventional WC particles to ultrafine WC carbide particles. The bending strength showed the similar trend of the hardness. The fracture behavior showed transgranular fracture mode as a dominant fracture mechanism in bimodal hardmetals with varying ratio of conventional WC particles to ultrafine WC particles.

Place, publisher, year, edition, pages
2008. p. 41-48
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-26889Local ID: 02659457-8f15-40a4-b494-3cd9f7b236b4ISBN: 978-0-9793488-8-4 (print)OAI: oai:DiVA.org:ltu-26889DiVA, id: diva2:1000069
Conference
International Conference on Tungsten, Refractory and Hardmaterials : 08/06/2008 - 12/06/2008
Note
Upprättat; 2008; 20150513 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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