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Development of a database for cemented carbides: Thermodynamic modeling and experiments
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2001 (English)In: Journal of phase equilibria (Print), ISSN 1054-9714, E-ISSN 1544-1032, Vol. 22, no 6, 645-655 p.Article in journal (Refereed) Published
Abstract [en]

A new database, for thermodynamic information for cemented carbides has been developed. A full description of the alloy system C-Co-N-Nb-Ta-Ti-W is presented. The work has involved both thermodynamic evaluations of lower order systems and experimental investigations. Full new assessments of the quaternary Ti-W-C-N, Ta-W-C-N, and Nb-W-C-N systems have been performed, including tests of the influence of model parameters on miscibility gaps in higher order systems. A new improved description of the Co-W-C system based on new experiments is used in the present work. The main results of the experimental work are measurements of the composition of the cubic carbide in selected equilibria; measurements of the temperatures of the liq + fcc + WC + gr. and liq + fcc + WC + M6C equilibria in the Co-W-C and Co-W-X-C (X = Ti, Ta, Nb) systems; and measurements of the solubility of Ti, Ta, and Nb in liquid in multicomponent alloys. The results of the assessments have been implemented into a new database. The database has successfully been used in a parallel project to simulate the formation of gamma -phase free zones in cemented carbides. A few other applications of industrial relevance are presented.

Place, publisher, year, edition, pages
2001. Vol. 22, no 6, 645-655 p.
Keyword [en]
c-n systems, phase-diagram, ti-c, w-c, thermochemistry
URN: urn:nbn:se:kth:diva-21198ISI: 000172939600008OAI: diva2:339895
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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