Microstructure and Tribological Behavior of Ultra-Fine Cemented Carbides

Abstract:

The chemical compositions and microstructures of several different cemented carbides were checked by XRD, XRF, SEM, metallographic microscope and stereomicroscope. The influences of phase compositions and microstructures on mechanical properties were investigated. The results show that improving the Co content and refining WC grain properly are effective means to acquire the excellent mechanical properties of cemented carbide. A series of friction and wear tests were carried out in a high-speed tribometer to explore the tribological behavior of three cemented carbides with different Co content and WC grain size against aluminum alloy 7050-T7451. It was found that the tribological behaviors of cemented carbides are largely dependent on their microstructures and mechanical properties. The enhancement of flexural strength and fracture toughness can be ascribed to deformation buffering effects of Co binder, but the improved hardness depends on the rigid skeleton of WC-WC grains.

• Periodical: Key Engineering Materials (Volume 693)
• Pages: 586-593
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.693.586
• Online since: May 2016
• Authors: Yong Zhi Pan*, Jun Zhao, J. Zhang
• Keywords: Aluminum Alloy, Cemented Carbide, Microstructure, Tribological Behavior

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