Effects of Combined Addition of Cr₃C₂ and NbC on Microstructure and Properties of Cemented Carbides Prepared by WС-Co Composite Powder

Abstract:

With addition various contents of combined grain growth inhibitors Cr₃C₂ and NbC into the ultrafine WC-Co6% composite powder, and the effects of codoped Cr₃C₂ and NbC addition on microstructure and properties of the alloys have been investigated by X-ray diffraction, scanning electron microscopy. The results showed that increasing the content of inhibitors in the composite powder, the abnormal grain growth disappeared and homogeneous ultrafine grain structure formed, i.e., the grain growth inhibitor promoted sintering densification process. WC grains were refined by the comprehensive effects of the Cr₃C₂/NbC dissolving in the Co phase to alter the interface energy and interfere the WC solution in the binder phase, which prevents the structure of cobalt change from the face-center-cubic into dense-hexagonal crystal, and to increases the transverse rupture strength.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 794-800
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.794
• Online since: March 2016
• Authors: Ai Min Jiang, Quan Li, Feng Jie Yang
• Keywords: Combined Grain Growth Inhibitors, Mechanical Properties, Microstructure, WC-Co Composite Powder

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