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Allibert, C . H .,Chabretou, V .,Lavergne, O .,Missiaen, J . M . 대한금속재료학회(대한금속학회) 1999 METALS AND MATERIALS International Vol.5 No.2
The liquid-phase sintering (LPS) of cemented carbides prepared from submicronic powders induces a microstructural evolution generally ascribed to normal and abnormal grain growth. Such phenomena can be prevented by small additions of inhibitors (Cr, V) Presently, the mechanisms controlling either the grain growth or its inhibition are not strictly identified. In the present work, the effects of major parameters on grain growth (initial WC grain size, liquid composition, liquid fraction) are studied by image analysis of specimens sintered at 1450℃ up to 8h. The evolution of the mean intercept and intercept distribution of WC grains is analysed in teens of the possible mechanisms involved.
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.
Computer Simulation of Particle Rearrangement in the Presence of Liquid
Lee, S . M .,Chaix, J . M .,Martin, C . L .,Allibert, C . H .,Kang, S . J . L . 대한금속재료학회(대한금속학회) 1999 METALS AND MATERIALS International Vol.5 No.2
A model was developed to describe the motion of particles which are connected by liquid bridges. The model takes into account capillary force, particles inertia, viscous drag of liquid, and elastic collision. Below a critical thickness of the liquid film between particles, the liquid is assumed to be in a visco-elastic state and follows the Maxwell model. For a single pair of particles, the model predicts that, as viscosity increases, the first particle contact occurs later, and subsequent particle bounce is weaker. In the case of planar arrays of 5000 particles, the particles agglomerate, generating pores between particle clusters during the rearrangement. The final density obtainable by particle rearrangement increases as viscosity increases. This result is attributed to the suppression of fast local densification in the case of high viscosity. The implications and limitations of the present analysis are also presented and discussed.
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.
Delphine G erardin,Anna Chiara Uggenti,Stephane Beils,Andrea Carpignano,Sandra Dulla,Elsa Merle,Daniel Heuer,Axel Laureau,Michel Allibert 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
The Molten Salt Fast Reactor (MSFR) with its liquid circulating fuel and its fast neutron spectrum calls fora new safety approach including technological neutral methodologies and analysis tools adapted to earlydesign phases. In the frame of the Horizon2020 program SAMOFAR (Safety Assessment of the Molten SaltFast Reactor) a safety approach suitable for Molten Salt Reactors is being developed and applied to theMSFR. After a description of the MSFR reference design, this paper focuses on the identification of thePostulated Initiating Events (PIEs), which is a core part of the global assessment methodology. To fulfilthis task, the Functional Failure Mode and Effect Analysis (FFMEA) and the Master Logic Diagram (MLD)are selected and employed separately in order to be as exhaustive as possible in the identification of theinitiating events of the system. Finally, an extract of the list of PIEs, selected as the most representativeevents resulting from the implementation of both methods, is presented to illustrate the methodologyand some of the outcomes of the methods are compared in order to highlight symbioses and differencesbetween the MLD and the FFMEA.