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References

Articles:
•	Longuet, A., Robert, Y., Aeby-Gautier, E., Appolaire, B., Mariage, J. F., Colin, C. and Cailletaud, G. A multiphase mechanical model for Ti-6Al-4V: Application to the modeling of laser assisted processing Computational Material Science, 46(3):761-766 2009 ISSN: 0927-0256 DOI: 10.1016/j.commatsci.2009.05.012 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
•	Xiong, X. C., Redjaïmia, A. and Goune, M. Pearlite in hypoeutectoid iron-nitrogen binary alloys Journal of Materials Science, 44(2):632-638 2009 ISSN: 0022-2461 DOI: 10.1007/s10853-008-3054-7 Resume: In this study, hypoeutectoid Fe-N binary specimens have been prepared by gas nitriding pure iron in austenite domain at 840 A degrees C. The slow cooling of these specimens led to the alpha-ferrite + gamma'-Fe(4)N pearlitic microstructure which is similar to the pearlite in Fe-C binary system. This pearlitic microstructure has been characterized by electron microscopy. The crystal structure of the gamma'-Fe(4)N nitride has been identified by electron microdiffraction and the Nishiyama-Wassermann (N-W) and near Kurdjumov-Sachs (K-S) orientation relationships have been found between the alpha-ferrite and the gamma'-Fe(4)N. Equipe: Département SI2M : Microstructures et Contraintes
•	Maniana, M., Azim, A., Rhanim, H. and Archambault, P. Problème inverse pour le traitement laser des mÃ©taux Ã transformations de phases International Journal of Thermal Sciences, 48:795--804 2009 DOI: doi:10.1016/j.ijthermalsci.2008.05.018 Equipe: Département SI2M : Microstructures et Contraintes

Articles:

•

Longuet, A., Robert, Y., Aeby-Gautier, E., Appolaire, B., Mariage, J. F., Colin, C. and Cailletaud, G.

A multiphase mechanical model for Ti-6Al-4V: Application to the modeling of laser assisted processing

Computational Material Science, 46(3):761-766

2009

ISSN: 0927-0256

DOI: 10.1016/j.commatsci.2009.05.012

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

•

Xiong, X. C., Redjaïmia, A. and Goune, M.

Pearlite in hypoeutectoid iron-nitrogen binary alloys

Journal of Materials Science, 44(2):632-638

2009

ISSN: 0022-2461

DOI: 10.1007/s10853-008-3054-7

Resume: In this study, hypoeutectoid Fe-N binary specimens have been prepared by gas nitriding pure iron in austenite domain at 840 A degrees C. The slow cooling of these specimens led to the alpha-ferrite + gamma'-Fe(4)N pearlitic microstructure which is similar to the pearlite in Fe-C binary system. This pearlitic microstructure has been characterized by electron microscopy. The crystal structure of the gamma'-Fe(4)N nitride has been identified by electron microdiffraction and the Nishiyama-Wassermann (N-W) and near Kurdjumov-Sachs (K-S) orientation relationships have been found between the alpha-ferrite and the gamma'-Fe(4)N.

Equipe: Département SI2M : Microstructures et Contraintes

•

Maniana, M., Azim, A., Rhanim, H. and Archambault, P.

International Journal of Thermal Sciences, 48:795--804

2009

DOI: doi:10.1016/j.ijthermalsci.2008.05.018

Equipe: Département SI2M : Microstructures et Contraintes

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