WC-Co-Re cemented carbides: Structure, properties and potential applications. (January 2019)

• Record Type: Journal Article
• Authors: Konyashin, I.; Farag, S.; Ries, B.; Roebuck, B.
• Is Part Of: International journal of refractory metals & hard materials. Volume 78(2019)
• Page Start: 247
• Page End: 253
• Publication Date: 2019-01
• Subjects: Cemented carbides -- Co-Re binders -- Microstructure -- High-temperature properties; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2018.10.001
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Cemented carbides of the WC-Co-Re system represent a new class of hard materials having a significantly increased Young's modulus, hot hardness and high temperature creep resistance. The WC-Co-Re phase diagram was evaluated and compared with the corresponding WC-Co phase diagram. Physical and mechanical properties of such composites were measured at room and elevated temperatures and compared with those of conventional WC-Co cemented carbides. Microstructures of the WC-Co-Re cemented carbides at different carbon contents, binder contents and WC grain sizes were examined. Rhenium being dissolved in the Co-based binder is found to be a very strong grain growth inhibitor with respect to WC coarsening during liquid-phase sintering. The Young's modulus, hot hardness and high temperature creep resistance of the WC-Co-Re cemented carbides are greater than those of conventional WC-Co cemented carbides. Due to their unique properties the WC-Co-Re materials can find applications in use in high-pressure high-temperature components for synthesis of diamond and c-BN and cutting Ni-based super alloys and other heat-generating workpiece materials. Highlights: WC-Co-Re phase diagram is evaluated and compared with WC-Co phase diagram. Microstructures of WC-Co-Re materials at different compositions are examined. Special features of fabrication conditions of WC-Co-Re materials are described. Physical and mechanical properties WC-Co-Re materials are measured. Potential applications of WC-Co-Re materials are evaluated