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Contribution of the Interface Energies to the Growth Process of Cemented Carbides WC-Co
Lay Sabine,Missiaen Jean-Michel,Allibert Colette H 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The driving forces and the probable processes of WC-Co grain growth are reanalysed from recent data of interface energy and microstructure. Grain growth is driven by the disappearing of the high energy WC/WC and WC/Co interfaces with habit planes different from {0001}, and facets and by the area decrease of the WC/WC and WC/Co interfaces with {0001} and habit planes. Grain growth mainly results of dissolution-precipitation. Abnormal grains are likely formed by defects assisted nucleation.
Elaboration of (Steel/Cemented Carbide) Multimaterial by Powder Metallurgy
Pascal Celine,Chaix Jean-Marc,Dutt Ankur,Lay Sabine,Allibert Colette H. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
A steel/cemented carbide couple is selected to generate a tough/hard two layers material. Sintering temperature and composition are deduced from phase equilibria, and experimental studies are used to determine optimal conditions. Liquid migration from the hard layer to the tough one is observed. Microstructure evolution during sintering of the tough material (TEM, SEM, image analysis) evidences coupled mechanisms of pore reduction and WC dissolution. Liquid migration, as well as interface crack formation due to differential densification are limited by suitable temperature and time conditions.