An observation of the binder microstructure in WC-(Co+Ru) cemented carbides using transmission Kikuchi diffraction. (1st July 2020)

• Record Type: Journal Article
• Authors: Eizadjou, Mehdi; Chen, Hansheng; Czettl, Christoph; Pachlhofer, Julia; Primig, Sophie; Ringer, Simon P.
• Is Part Of: Scripta materialia. Number 183(2020)
• Page Start: 55
• Page End: 60
• Publication Date: 2020-07-01
• Subjects: WC-(Co+Ru) cemented carbides -- Microstructure -- TKD -- Twin boundaries -- Martensitic transformation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.03.010
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The microstructure of WC-(Co+Ru) cemented carbides was studied using transmission Kikuchi diffraction (TKD). We report that the Co FCC grains contain Σ3-annealing twins which undergo an incomplete martensitic transformation to form Co HCP laths on cooling below TMs . The parent Co FCC and product Co HCP phases are related via the Shoji-Nishiyama orientation relationship. Four variants of the Co HCP plates exhibit a special misorientation of 70.5 ± 0.2° 〈 11 2 ¯ 0 〉 . A higher transformed fraction was observed in the sample possessing the lower binder content and finer WC grains. We suggest that this is due to the availability of more WC-binder interfaces, which facilitate Co HCP plate nucleation. Graphical abstract: Image, graphical abstract