Microstructure evolution in the cemented carbides WC-Co. II. Cumulated effects of Cr additions and of the CAV ratio on the crystal features of the WC grains

The influence of an addition of Cr, introduced to replace 5 at% Co on the microstructure evolution of WC-13 at% Co with different C/W ratio is examined at 1450 deg . Three alloys consisting of WC and Co binder and containing a graphite or eta excess are studied by SEM and TEM. The effects of Cr are...

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Published in:Physica status solidi. A, Applied research Applied research, 2002-09, Vol.193 (2), p.284-293
Main Authors: Wang, Y, Pauty, E, Lay, S, Allibert, C H
Format: Article
Language:English
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Summary:The influence of an addition of Cr, introduced to replace 5 at% Co on the microstructure evolution of WC-13 at% Co with different C/W ratio is examined at 1450 deg . Three alloys consisting of WC and Co binder and containing a graphite or eta excess are studied by SEM and TEM. The effects of Cr are similar to those induced by a W excess in the undoped alloys: decrease of the mean grain growth and change of the interface features of the WC grains. The interface modification - less faceted, with steps - indicates a decrease of interface energy anisotropy and suggests a coarsening mechanism limited by the growth of the steps. The specific role of Cr on the hindrance of large grain formation depends on the C/W ratio.
ISSN:0031-8965