References of "Lecomte-Beckers, Jacqueline"
     in
Bookmark and Share    
See detailTitanium alloys
Lecomte-Beckers, Jacqueline ULg

Scientific conference (2004, June)

Detailed reference viewed: 4 (1 ULg)
Full Text
Peer Reviewed
See detailMesoscopic model of intergranular cracks in low carbon steel during cooling of continuous casting
Castagne, S.; Pascon, Frédéric ULg; Lecomte-Beckers, Jacqueline ULg et al

in Lamberigts, M. (Ed.) Proceedings of the 2nd international conference of thermomechanical processing of steels (TMP 2004) (2004)

This paper addresses the problem of transverse cracking during the continuous casting of low carbon steel. The damage mechanisms occurring at high temperature during this process are identified and a ... [more ▼]

This paper addresses the problem of transverse cracking during the continuous casting of low carbon steel. The damage mechanisms occurring at high temperature during this process are identified and a numerical approach for the modelling of these phenomena at the grain scale is proposed. Experiments allowing the identification of the model’s parameters are described. Finally, the first results obtained with the model are presented. [less ▲]

Detailed reference viewed: 38 (4 ULg)
Full Text
Peer Reviewed
See detailMelting and crystallisation behaviour of multi-component Fe-C-Cr-X alloys : microstructural aspects
Tchuindjang, Jérôme Tchoufack ULg; Lecomte-Beckers, Jacqueline ULg

in Proceedings of the 13th European Microscopy Congress (2004)

Studied materials are of the Fe-C-Cr-X multi-component system where X represents a group of strong carbides formers as Mo, V, or Nb. These alloys are used for wear components. Differential Thermal ... [more ▼]

Studied materials are of the Fe-C-Cr-X multi-component system where X represents a group of strong carbides formers as Mo, V, or Nb. These alloys are used for wear components. Differential Thermal Analysis (DTA) was used to determine the melting and solidification behaviour of these materials. Raw material has a thermomecanical history that involved casting, heat treating and hot forming, which could be investigated by the melting sequence of the DTA trial. [less ▲]

Detailed reference viewed: 19 (6 ULg)
Full Text
Peer Reviewed
See detailStructural investigations of HSS rolls for hot strip mill
Lecomte-Beckers, Jacqueline ULg; Tchuindjang, Jérôme Tchoufack ULg; Ernst, R. et al

in Proceedings of the 41st Rolling Seminar Processes, Rolled and Coated Product (2004)

High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills (HSM). Good wear resistance and hardness at high temperatures, are defining features of HSS. Previous experience has ... [more ▼]

High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills (HSM). Good wear resistance and hardness at high temperatures, are defining features of HSS. Previous experience has shown that HSS rolls containing mainly hard MC carbides have a high friction coefficient, which is detrimental for the rolling power consumption and for the strip surface quality. On the other hand, HSS rolls containing eutectic rod shaped carbides are brittle and more susceptible to spalling. To overcome these problems, a suitable grade, called HSS7, that gives the best compromise between a low friction coefficient and a high crack propagation and wear resistance was developed. That alloy contains well-dispersed hard VC carbides improving wear, and non-interconnected eutectic carbides of the M2C and M7C3 type, hindering crack propagation. All the metallurgical factors affecting the performance and damage of under rolling condition in front finishing stands are reviewed: wear resistance, friction coefficient, resistance to rolling incident, and oxide film formation. The effect of nature, morphology and amount was for each of the carbides studied and connected to the factor affecting the behaviour of the new grade developed. Different techniques are used such as: differential thermal analysis, optical and electron scanning microscopy and image analysis. A correlation with mechanical properties was also performed. [less ▲]

Detailed reference viewed: 55 (10 ULg)
Full Text
Peer Reviewed
See detailStudy of the cooling process of an extruded aluminium profile
Bouffioux, Chantal ULg; Carton, Marc ULg; Lecomte-Beckers, Jacqueline ULg et al

in Gosh, Somnath; Castro, Jose M.; Lee, June K. (Eds.) Proceedings of Materials Processing and Design: Modeling, Simulation and Applications (NUMIFORM 2004) (2004)

The prediction of the final axial stresses and the residual strains of complex extruded aluminium profiles requires a good knowledge of the material behavior and of the industrial process. This paper is ... [more ▼]

The prediction of the final axial stresses and the residual strains of complex extruded aluminium profiles requires a good knowledge of the material behavior and of the industrial process. This paper is focused on the methods required to provide the whole set of data: material ones and process ones. Scanning differential calorimetry, dilatometry and diffusivity tests identify thermophysic material properties and hot tensile tests identify parameters of the elastovisco- plastic Norton-Hoff law. The description of the industrial process and its simulations are described. Then a sensitivity analyzis provides the cooling key parameters causing the undesired final curvature during the industrial process. [less ▲]

Detailed reference viewed: 67 (5 ULg)
Full Text
Peer Reviewed
See detailLingopti project: semi-continuous casting process of copper-nickel alloys
Pecquet, Etienne ULg; Volles, Ralf; Lecomte-Beckers, Jacqueline ULg et al

in Proceedings of the 21st International Congress of Theoritical and Applied Mechanics (2004)

The following text deals with casting of copper-nickel alloys. They are high added values materials. The research contains two main parts. Laboratory tests (completed with bibliography) that provide ... [more ▼]

The following text deals with casting of copper-nickel alloys. They are high added values materials. The research contains two main parts. Laboratory tests (completed with bibliography) that provide thermal and mechanical properties of the ingot and the mould but also heat transfer coefficients between the ingot and its environment (mould, air and water). These parameters are required in the second part : development and validation of numerical modelization by the finite element method to optimise the industrial process. [less ▲]

Detailed reference viewed: 38 (11 ULg)
Full Text
Peer Reviewed
See detailCharacterisation of thermophysical properties of semi-solid steels for thixoforming
Lecomte-Beckers, Jacqueline ULg; Rassili, Ahmed ULg; Carton, Marc ULg et al

in Proceedings of the 8th International Conference on Semi-Solid Processing of Alloys and Composites (S2P) (2004)

Major challenge for semi-solid processing includes broadening the range of alloys that can be successfully thixoformed and developing alloys specifically for thixoforming. One important parameter is ... [more ▼]

Major challenge for semi-solid processing includes broadening the range of alloys that can be successfully thixoformed and developing alloys specifically for thixoforming. One important parameter is appropriate solidus-liquidus interval. The wider the solidification interval, the wider the processing window. This study is related to the experimental determination of this critical parameter on eight different steel compositions. This parameter was obtained using Differential Scanning Calorimetry. This technique allows to obtain the solid fraction versus temperature. The paper also presents the results of thermophysical properties determination such as thermal diffusivity, heat capacity and thermal conductivity. These properties were measured from room temperature to semi-solid state in one particular steel. The thermal diffusivity was measured using the Laser Flash method and the heat capacity using a DSC calorimeter. The thermal conductivity was obtained by calculation knowing the thermal dilatation measured with a dilatometer. All these measurements were performed for temperatures up to the liquidus. These parameters are difficult to measure but they are important to determine for the conductive heating phase of a semi-solid forming (SSM) process. [less ▲]

Detailed reference viewed: 42 (3 ULg)
Full Text
Peer Reviewed
See detailPreparation of BaZrO3 powders by a spray-drying process
Robertz, B.; Boschini, Frédéric ULg; Rulmont, André ULg et al

in Journal of Materials Research (2003), 18(6), 1325-1332

The potential use of barium zirconate for the manufacture of corrosion-resistant substrates emphasizes the need for a simple, inexpensive, and easily scalable process to produce high-quality powders with ... [more ▼]

The potential use of barium zirconate for the manufacture of corrosion-resistant substrates emphasizes the need for a simple, inexpensive, and easily scalable process to produce high-quality powders with well-controlled composition and properties. However, the classical solid-state preparation of barium zirconate leads to an inhomogeneous powder unsuitable for applications in highly corrosive environment. For this paper, the possibility to use the spray-drying technique for the preparation of BaZrO3 powders with a controlled size distribution and morphology was investigated. The influence of the nature and concentration of the precursor solution and the influence of the spray-drying step are discussed on the basis of x-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and dilatometric measurements. [less ▲]

Detailed reference viewed: 51 (4 ULg)
See detailHSS alloys
Lecomte-Beckers, Jacqueline ULg

Scientific conference (2003, June)

Detailed reference viewed: 2 (0 ULg)
Full Text
See detailStudy of complex carbides obtained after solidification and thermal treatment in High Speed Steels
Tchuindjang, Jérôme Tchoufack ULg; Lecomte-Beckers, Jacqueline ULg

in Proceedings des journées annuelles de la Société belge de physique SBP-BSP (27 et 28 mai 2003) (2003, May)

High-speed steels (HSS) rolls are used in front finishing stands of hot strip mills. Good wear resistance and hardness at high temperature are defining characteristics of HSS. Many carbides are present in ... [more ▼]

High-speed steels (HSS) rolls are used in front finishing stands of hot strip mills. Good wear resistance and hardness at high temperature are defining characteristics of HSS. Many carbides are present in these alloys, each having different effects upon the final properties of HSS. As a result, the nature, the morphology and the amount of these carbides are factors of important concern. Optical microscopy combined with electron microscopy lead to quicker identification and characterization of HSS carbides. [less ▲]

Detailed reference viewed: 30 (7 ULg)
See detailNuclear materials I
Lecomte-Beckers, Jacqueline ULg

Learning material (2003)

*Brief review of most important mechanical properties of materials - stress-strain relationship - ductile and brittle fracture; ductile-brittle transition - fatigue failure - creep * Stress analysis ... [more ▼]

*Brief review of most important mechanical properties of materials - stress-strain relationship - ductile and brittle fracture; ductile-brittle transition - fatigue failure - creep * Stress analysis: stress intensity, thermal stresses * Functional requirements of materials in a nuclear environment - "nuclear" materials: fuel, fuel cladding, moderator/reflector, coolant - structural materials: reactor internals and vessel, piping, valves * Degradation mechanisms of materials in a nuclear environment - radiation effects: general principles, atomic displacements, embrittlement, swelling fatigue: due to thermal stresses and stratification - corrosion: p.m. (to be developed in course "Nuclear Materials II" * Detailed treatment of important materials in a nuclear environment (especially nuclear- mechanical interactions and relationships) - fuel and cladding - moderator/reflector - structural materials (incl reactor internals, reactor vessel) [less ▲]

Detailed reference viewed: 17 (4 ULg)
Full Text
Peer Reviewed
See detailLingopti project: semi-continuous casting process of coper-nickel alloys
Pecquet, Etienne ULg; Pascon, Frédéric ULg; Lecomte-Beckers, Jacqueline ULg et al

in Dick, E.; Vierendeels, J.; Cantrijn, F. (Eds.) et al Proceedings of the 6th national congress on theoretical and applied mechanics (2003)

Lingopti project is a First Europe project. It treats semi-continuous casting of copper-nickel alloys ingots. The research, performed in the University of Liège, consists in the optimisation of the mould ... [more ▼]

Lingopti project is a First Europe project. It treats semi-continuous casting of copper-nickel alloys ingots. The research, performed in the University of Liège, consists in the optimisation of the mould and the whole casting process of the LBP S.A. company (Chênée – Liège) to obtain better cast products. In fact, cast products sometimes present long oscillation marks (λ ≈ 500mm) and some ingots have many internal cracks. The semi-continuous process consists in the vertical casting of 7m height ingots. The goal is also to test different chemical compositions of the material and to predict what happens on the casting process. [less ▲]

Detailed reference viewed: 71 (5 ULg)
Full Text
See detailInclusions and Carbides characterisation in High-Speed Steels
Tchuindjang, Jérôme Tchoufack ULg; Lecomte-Beckers, Jacqueline ULg

in Proceedings de la journée de la société belge de microscopie (SBM-BVM), RUCA, UA (2003)

Prior to assessment of inclusions and carbides is the identification of thes particles. The present survey shows how we determine the nature of inclusions and carbides, while using Scanning Electron ... [more ▼]

Prior to assessment of inclusions and carbides is the identification of thes particles. The present survey shows how we determine the nature of inclusions and carbides, while using Scanning Electron Microscopy and Energy Dispersive Spectroscopy with X-Rays. [less ▲]

Detailed reference viewed: 17 (3 ULg)
Full Text
Peer Reviewed
See detailDevelopment of a new high-speed steel with optimized carbide composition for mill rolls
Lecomte-Beckers, Jacqueline ULg; Tchuindjang, Jérôme Tchoufack ULg; Pirard, Eric ULg et al

in Stal' (2003), 2

High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills. Good wear resistance and hardness at high temperatures, are defining features of HSS. Many types of carbides are ... [more ▼]

High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills. Good wear resistance and hardness at high temperatures, are defining features of HSS. Many types of carbides are present in these alloys, each having different effect upon their final properties. As a result, nature, morphology and amount of these carbides are factors of important concern. Identification and characterisation of carbides were realised. MC, M2C, M7C3 carbides were found. Some relationships with mechanical properties were obtained especially in the field of the solidification sequence that affects grain size and carbides dispersion. [less ▲]

Detailed reference viewed: 29 (8 ULg)