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

Autor: Christoph Czettl, Mehdi Eizadjou, Simon P. Ringer, Hansheng Chen, Sophie Primig, Julia Pachlhofer
Rok vydání: 2020
Předmět:
Zdroj: Scripta Materialia. 183:55-60
ISSN: 1359-6462
Popis: The microstructure of WC-(Co+Ru) cemented carbides was studied using transmission Kikuchi diffraction (TKD). We report that the CoFCC grains contain Σ3-annealing twins which undergo an incomplete martensitic transformation to form CoHCP laths on cooling below TMs. The parent CoFCC and product CoHCP phases are related via the Shoji-Nishiyama orientation relationship. Four variants of the CoHCP 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 CoHCP plate nucleation.
Databáze: OpenAIRE