2014 | |
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Inorganic Chemistry,
53 (1):147-159
2014
Equipe: Département SI2M : Microstructures et Contraintes |
2011 | |
Articles: | |
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ISIJ International,
51(10):1724-1732
2011
ISSN: 0915-1559
Resume: We elaborated two carbide-free bainitic steels with different microstructures through specific alloy design and austempering process. Microstructural characterizations were performed by means of EBSD analysis and in-situ high energy synchrotron diffraction in order to evaluate the phase fractions and the carbon content in the retained austenite, as well as the microtextures. These microstructural features were correlated to the tensile properties. Both steels exhibited an excellent compromise between high strength (above 1 250 MPa), good ductility (uniform elongation up to 14%) and high fracture strain (reduction of area up to 46%). The volume fraction of MA blocks (blocks of retained austenite partially transformed into fresh martensite during the final cooling at room temperature) was a key relevant parameter that strongly influenced the work-hardening at the expense of the damaging processes at high strain. Equipe: Département SI2M : Microstructures et Contraintes |
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Solid State Phenomena,
172-174:747-752
2011
Equipe: Département SI2M : Microstructures et Contraintes |
2010 | |
Articles: | |
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International Journal of Microstructure and Materials Properties,,
5 (1):65-78
2010
Equipe: Département SI2M : Microstructures et Contraintes |
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Nuclear Engineering and Design,
240:1975-1985
2010
Equipe: Département SI2M : Microstructures et Contraintes |
2009 | |
Articles: | |
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Computational Material Science,
46(3):761-766
2009
ISSN: 0927-0256
Resume: A multiphase model for Ti-6Al-4V is proposed. This material is widely used in industrial applications and so needs accurate behaviour modeling. Tests have been performed in the temperature range from 25 degrees C to 1020 degrees C and at strain rates between 10(-3) s(-1) and 1 s(-1). This allowed the identification of a multiphase mechanical model coupled with a metallurgical model. The behaviour of each phase is calibrated by solving an inverse problem including a phase transformation model and a mechanical model to simulate tests under thermomechanical loadings. A scale transition rule (beta-rule) is proposed in order to represent the redistribution of local stresses linked to the heterogeneity of plastic strain. Finally this model is applied to two laser assisted processes: direct laser fabrication and laser welding. (C) 2009 Elsevier B.V. All rights reserved. Equipe: Département SI2M : Microstructures et Contraintes |
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European Journal of Computational Mechanics,
18(5-6):485-523
2009
ISSN: 1779-7179
Equipe: Département SI2M : Microstructures et Contraintes |
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Computational Materials Science,
45(3):800-805
2009
ISSN: 0927-0256
Equipe: Département SI2M : Microstructures et Contraintes |
2008 | |
Articles: | |
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International Journal of Microstructure and Materials Properties,
3(1):150
2008
ISSN: 1741-8429
Equipe: Département SI2M : Microstructures et Contraintes |
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Materials Science and Engineering: A,
487(1-2):33-45
2008
ISSN: 0921-5093
Equipe: Département SI2M : Microstructures et Contraintes |