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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

Effect of Cr and V on phase equilibria in Co–WC based hardmetals

  • Karin Frisk and Andreas Markström

Abstract

New measurements of the influence of Cr and V on the melting temperature of the binder phase in Co-based hardmetals are presented. It was shown that both Cr and V affect the melting temperature significantly. Cr decreases the melting temperature by over 100°C, and V by approximately 40°C. This is due to the high solubility of Cr and V in liquid Co, and this solubility was determined by experiments and calculations. The solubility of Cr in solid fcc-Co is also discussed, as well as the composition of the MC, M7C3 and the M6C carbides in alloys with Cr and V. The new experimental information is used to obtain a reliable thermodynamic description of the binder phase (Co-rich) in C – Co – Cr – W and C – Co – V – W alloys. Calculated equilibria are compared with experiments.


* Correspondence address, Karin Frisk, Swerea KIMAB AB, P. O. Box 55970 SE-10216 Stockholm, Sweden, Tel.: +46 8 440 48 47, Fax: +46 8 440 45 35, E-mail: , www.swereakimab.se

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Received: 2007-5-16
Accepted: 2007-12-19
Published Online: 2013-06-11
Published in Print: 2008-03-01

© 2008, Carl Hanser Verlag, München

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