Abstract
The paper describes an unusual transformation that takes place only within the deformed region of identations. Under a suitable ambient temperature decarburization of cemented WC-Co on annealing is enhanced by prior localized deformation. Within individual WC grains, plate-like growth of a mixed carbide (either Co/sub 3/W/sub 3/C or Co/sub 6/W/sub 6/C) occurs preferentially. On some occasions intrusion of the substoichiometric carbide is preceded by a structural transformation in the WC slip band. This transformation is consistent with the formation of an orthorhombic (pseudo-hexagonal) WC phase that may be derived from the original structure by the passage of one partial dislocation on every sucessive slip plane.
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