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Carbide/binder interfaces in Ti(CN)–(Ti,W)C/(Ti,W)(CN)-based cermets

Author:
Park, Choongkwon   Nam, Sangwoo   Kang, Shinhoo  


Journal:
Journal of Alloys and Compounds


Issue Date:
2016


Abstract(summary):

Highlights

The addition of (Ti0.88W0.12)C significantly improved the toughness of cermets.

The ceramic particles in the cermets exhibited {111} plane faceting.

The coherency state at the core/rim/binder interfaces led to high toughness.

The thermal stability of constituents and nitrogen in the system are the main causes.

Abstract

Partially solutionized carbide cermets (PSCs) were prepared for cutting tool applications by replacing a portion of Ti(CN) with (Ti0.88W0.12)C or (Ti0.88W0.12)(C0.7N0.3) in a conventional Ti(CN)-based cermet. The PSC containing (Ti0.88W0.12)C exhibited high fracture toughness with no loss of hardness. The elimination of Ti(C0.7N0.3) cores in the microstructure reduced the strain at the core/rim interfaces, leading to the increase in fracture toughness. The PSC containing (Ti0.88W0.12)C showed coherent relationships at the core/rim and rim/binder interfaces, contributing to the improved mechanical properties. In contrast, nitrogen in (Ti0.88W0.12)(C0.7N0.3) resulted in a different microstructure and properties. The major factors determining the mechanical properties of the cermets are discussed in terms of the carbide/binder interfaces and the thermal stability of the added carbides.

Graphical abstract



Page:
671-677


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