Cerri, Olivier (2007) Hot tearing in steels during solidification. Experimental characterization and thermomechanical modeling. PhD thesis Sciences et Génie des Matériaux, CEMEF- Centre de mise en forme des matériaux, ENSMP p.204.

Full text available as: - these-Cerri.pdf ( 6705 Kb )

Licence: Copyright

Alternative Locations: http://tel.archives-ouvertes.fr/tel-00239189/fr/

Abstract

Hot tearing is a major defect in castings or semi-finished cast products. It consists in the opening of cracks in the mushy zone and more precisely in the areas with high fraction of solid (typically 0.9 and beyond), when the material is subjected to deformations leading to local tensile stress. Various kinds of criteria have been previously developed to highlight a risk of formation of hot tears. The aim of this study is to evaluate their capability to predict the occurrence of hot tears correctly. In order to do so, two kinds of tests have been analyzed with the use of a thermomechanical model in which criteria have been implemented. A new constrained solidification testing apparatus has then been designed and contructed. This laboratory set-up proved to be discriminating because the generation of hot tears did occur, or not, depending on the configuration of the test. These defects are quite similar to those detected in industrial processes. Another evaluation has been performed on a semi industrial scale test, which consists in bending a semi-solid steel ingot. These comparisons succeeded in revealing that accumulated strain is a key parameter in hot tearing problems. Thus, the most significant criterion has been improved in order to predict more accurately the occurrence of hot tears in industrial configuration.

References

Bibliographie Chapitre 1 :

[Bernhard, 2000] C. Bernhard, H. Hiebler, M.M. Wolf, Simulation expérimentale de la formation des criques sous-cutanées en coulée continue, La revue de Métallurgie-CIT, 2000.

[Bobadilla, 1988] M. Bobadilla, B. Chamont, C. Gatellier, J.M. Jolivet, Etude de la fragilité à la solidification d’aciers au carbone, Commission des Communautés Européennes, Convention n°7210-CA/316, RE 88/023, 1988.

[Braccini, 2000] M. Braccini, Optimisation des pièces moulées : Etude des phénomènes de fissuration à chaud dans les alliages Al-Cu. Thèse de l’Institut National Polytechnique de Grenoble, 2000.

[Carpenter, 2004] K. Carpenter, The influence of microalloying elements on the hot ductility of thin slab cast steel, Thèse de l’Université de Wollongong, Australie, 2004.

[Clyne, 1979] T.W. Clyne, GJ. Davies, Comparison between experimental data and theorical predictions relating to dependence of solidification cracking on composition, Solidification and casting of metals, Metals Society; 1979, pp. 275.

[Dahle, 1996] A. K. Dahle, L. Arnberg, Overview : the rheological properties of solidifying aluminium foundry alloys, J. O. M.,1996, pp.34-37.

[Decultieux, 1996] F. Decultieux, Caractérisation du comportement thermomécanique d’alliages de fonderie pendant la solidification, Thèse de l’Ecole des Mines de Paris, 1996.

[Drezet, 1998] J-M. Drezet, M. Rappaz, Study of hot tearing in aluminium alloys using the ring mold test, Modelling of casting, Welding and Advanced solidification Processes VIII, éd B.G. Thomas et C. Beckerman, TMS, 1998.

[Drezet, 2001] J.M. Drezet, M.Rappaz, Prediction of hot tears in DC-CAST Aluminium Billets, Anjier JL, Light metals, 2001, pp. 887.

[Drezet, 2002] J.-M. Drezet, M. Gremaud, R. Graf, M. Gaumann, A new hot tearing criterion for steel, Proceedings of the 4th European Continuous Casting Conference, Birmingham, UK, 2002

[Eskin, 2004a] D. G. Eskin, Suyitno, L. Katgerman, Mechanical properties in the semi-solid state and hot tearing of aluminium, Progress in Materials Science, Vol.49, 2004, pp.629-711

[Eskin, 2004b] D.G. Eskin, Suyitno, J.F. Mooney, L. Katgerman, Contraction of aluminium alloys during and after solidification, Metall Mater Trans, Vol 35A, 2004, pp.1325

[Farup, 2001] I. Farup, J.M. Drezet, M. Rappaz, In situ observation of hot tearing formation in succinonitrile-acetone, Acta Materialia, Vol.49, 2001, pp.1261-1269.

[Feurer, 1976] U. Feurer, Mathematisches Modell der Warmribneigung von binären Aluminiumlegierungen, Giesserei-Forschung, Vol.28, 1976, pp.75

[Feurer, 1977] Feurer U. In: Nieswaag H, Schut JW, editors. Quality control of engineering alloys and the role of metals science. Delft: Delft University of Technology; 1977. pp. 131

[Fredriksson, 1979] H. Fredriksson, B. Lehtinen, Continuous observation of hot crack-formation during the deformation and heating in SEM, Solidification and Casting of Metals, 1979, pp. 260-267

[Gerds, 1976] A. F. Gerds, E.M. Stein, E.E. Fletcher, A.R. Elsea, La crique dans les pièces moulées en acier, Steel Founders’ Society of America, 1976

[Grandfield, 2001] JF. Grandfield, DJ. Cameron, JA. Taylor, Application of a new hot tearing analysis to horizontal DC cast magnesium alloy AZ91, Light metals 2001, pp. 895

[Grasso, 2004] P.D. Grasso, Coalescence and mechanical behaviour of semi-solid aluminium alloys in relation to hot tearing, Thèse de l’Ecole Polytechnique Fédérale de Lausanne, 2004.

[Guven,1988] YF. Guven, JD. Hunt, Hot tearing in aluminium copper alloy, Cast Metals 1988; pp.1-104.

[Hansson, 2001] K. Hansson, On the hot crack formation during solidification of iron-base alloys, Thèse de l’Institut Royal de Technologie, Stockholm, Suède, 2001

[Instone, 2000] S. Instone, D. St John, J. Grandfield, New Apparatus for characterising the tensile strength development and hot cracking in the mushy zone, Int J Cast Metals Res, 2000; vol.12, pp.441-456

[Katayama, 1985] S. Katayama, A. Matsunawa, T. Fujimoto, Correlation among solidification process, microstructure, microsegregation and solidification cracking susceptibility in stainless steel weld metals, Transactions of JWRI, vol. 14, n°1, 1985

[Katgerman, 1982] L. Katgerman, A mathematical model for hot cracking of aluminium alloys during DC casting, JOM, 34(20), 1982, pp.46.

[Keene, 1988] B.J. Keene, Review of data for the surface tension of iron and Its binary alloys, Int. Mater. Rev. vol. 33, no. 1, 1-37, 1988.

[Kotecki, 1993] D.J. Kotecki, Welding of Stainless Steel, ASM Handbook, Vol. 6, 1993, pp. 677-707.

[Kraemer, 1986] R. Kraemer, J. Y. Lamant, M. Larrecq, P. Rabier, Comportement mécanique de la brame dans la zone de refroidissement secondaire d’une machine de coulée continue d’acier, Rapport interne, IRSID, UNIREC, 1986

[Katgerman, 1982] L. Katgerman, A mathematical model for hot cracking of aluminium alloys during DC casting, JOM, 34(20), 1982, pp.46.

[Lahaie, 2001] D. J. Lahaie, M. Bouchard, Physical modeling of the deformation mechanisms of semisolid bodies and a mechanical criterion for hot tearing, Metall. Mater. Trans. B, Vol 32 A, 2001, pp. 697-705

[Langlais, 2000] J. Langlais, JE. Gruzleski, A novel approach to assessing the hot tearing susceptibility of aluminium alloys, Mater Sci Forum, Vol.331–337, 2000; pp.167

[Li, 2003] C. Li, B.G. Thomas, Thermo-mechanical Finite Element Model of Shell Behavior in Continuous Casting of Steel, Modeling of Casting, Welding and Advanced Solidification Process X, TMS, San Destin, FL, May 25-30, 2003

[Ludwig, 2004] O. Ludwig, Etude expérimentale et modélisation du comportement rhéologique d’alliages Al-Cu en cours de solidification dans le cas de la fissuration à chaud en coulée continue, Thèse de l’Institut National Polytechnique de Grenoble, 2004

[Magnin, 1996] B. Magnin, L. Maenner, L. Katgerman, S. Engler, Ductility and rheology of al-4.5%Cu alloy from room temperature to coherency temperature, Mater Sci Forum, Vol.217–22. , 1996, pp.1209

[Monroe, 2005] C. Monroe, C. Beckermann, Development of a hot tear indicator for steel castings, Materials Science and Engineering: A, Vol. 413-414, 2005, pp. 30-36

[Novikov, 1965] II Novikov, Novik FS. Izv Vyssh Uchebn Zaved, Tsvetn Metall 1965;4:131.

[Novikov, 1995] II Novikov, Grushko OE. Mater Sci Technol 1995;11:926.

[Pierer, 2007] R. Pierer, C. Bernhard, C. Chimani, A contribution to hot tearing in the continuous casting process, Rev. Met. Paris, N°2 (February 2007), 2007, pp. 72-83

[Place, 1995] J.L. Place, Défaut de crique dans l’acier moulé, 95 F 005, Aciéries Delachaux, Association Technique de Fonderie, 1995

[Prokhorov, 1962] NN. Prokhorov, Russian Castings Production 1962;2:172.

[Rappaz, 1999] M. Rappaz, JM. Drezet, M. Gremaud, A new hot-tearing criterion, Metall Mater Trans A, 1999, Vol.30A, pp.449-456.

[Rogberg, 1983] B. Rogberg, An Investigation on the hot ductility of steels by performing tensile tests on In situ solidified samples, Scand. J. Metall., vol. 12, 1983, pp. 51-66

[Seol, 2002] D.J. Seol, K.H. Oh, J.W. Cho, J. Lee U. Yoon, Phase-field modelling of the thermo-mechanical properties of carbon steels, Acta Materiala 50, 2202, pp.2259-2268

[Suyitno, 2002] Suyitno, WH. Kool, L. Katgerman, Micro-mechanical model at triple junctions in DC casting, Light metals, Mat Sci Forum, Vol.396–402, 2002, pp.179.

[Suyitno, 2003] Suyitno, WH. Kool, L. Katgerman, Evaluation of mechanical and nonmechanical hot tearing criteria for DC casting of an alluminium alloy, 2003, pp. 753.

[Suyitno, 2004] Suyitno, D. Eskin, L. Katgerman, Effect of casting speed on structure formation and hot tearing during direct chill casting of Al-Cu alloys, Solidification Processes and Microstructures: A Symposium in Honor of W. Kurz, TMS Mar. 2004, pp. 47

[Suyitno, 2005] Suyitno, WH. Kool, L. Katgerman, Hot tearing criteria evaluation for direct chill casting of an Al-4.5Pct Cu alloy, Metall. Mater. Trans. A, Vol 36 A, 2005, pp. 1537-1546.

[Suyitno, 2006] Suyitno, D.G. Eskin, L. Katgerman, Structure observations related to hot tearing of Al–Cu billets produced by direct-chill casting, Materials Science and Engineering: A, Vol. 420, 2006, pp. 1-7

[Wintz, 1994] M. Wintz, M. Bobadilla, J.M. Jolivet, Fragilité à la solidification des acier : influence du carbone, du soufre et du phosphore, La revue de Métallurgie-CIT, 1994.

[Won, 2000] YM. Won, TJ. Yeo , DJ. Seol, KH. Oh, a new criterion for internal crack formation in continuously cast steels, Metall Mater Trans B, 2000, Vol.31B, pp.779-794.

[Yamanaka, 1991] A. Yamanaka, K. Nakajima, K. Yasumoto, H. Kawashima, K. Nakai, Mesurement of critical strain for solidification cracking, Model. Cast. Weld. Adv. Solidification processes V, ed. M. Rappaz, Min. Met. Mat. Society, 1991, pp.279

[Zhao, 2000] L. Zhao, Baoyin, N. Wang, V. Sahajwalla, RD. Pehlke, The rheological properties and hot tearing behaviour of Al-Cu alloy, Int J Cast Metals Res 2000;13(3), pp.167.

Bibliographie Chapitre 2 :

[Briggs, 1968] C.W. Briggs, Hot tearing in steel castings, Steel Founders’ Society of America, Rocky River, 1968.

[Hansson, 2001] K. Hansson, On the hot crack formation during solidification of iron-base alloys, Thèse de l’Institut Royal de Technologie, Stockholm, Suède, 2001.

[Instone, 2000] S. Instone, D. St John, J. Grandfield, New Apparatus for characterising the tensile strength development and hot cracking in the mushy zone, Int J Cast Metals Res, 2000; vol.12, pp.441-456

[Kerrouault, 2001] N. Kerrouault, Fissuration à chaud en soudage d’un acier inoxydable austénitique, Thèse du CEA Saclay, 2001.

[Wintz, 1994] M. Wintz, M. Bobadilla, J.M. Jolivet, Fragilité à la solidification des acier : influence du carbone, du soufre et du phosphore, La revue de Métallurgie-CIT, 1994.

[Yamanaka, 1991] A. Yamanaka, K. Nakajima, K. Yasumoto, H. Kawashima, K. Nakai, Mesurement of critical strain for solidification cracking, Model. Cast. Weld. Adv. Solidification processes V, ed. M. Rappaz, Min. Met. Mat. Society, 1991, pp.279

Bibliographie Chapitre 3 :

[Abbaschian, 2003] L. Abbaschiana, M. S. F. de Limab, Cracking Susceptibility of Aluminum Alloys During Laser Welding, Materials Research, Vol. 6, No. 2, pp. 273-278, 2003.

[Bobadilla, 1988] M. Bobadilla, B. Chamont, C. Gatellier, J.M. Jolivet, Etude de la fragilité à la solidification d’aciers au carbone, Commission des Communautés Européennes, Convention n°7210-CA/316, RE 88/023, 1988.

[Clyne, 1975] T. W. Clyne, G.J. Davies, A Quantitative Solidification Cracking Test for Castings and an Evaluation of Cracking in Aluminum-Magnesium Alloys, Br. Foundryman. Vol. 68, Pt. 9, pp. 238-244. Sept. 1975

[Clyne, 1979] T.W. Clyne, GJ. Davies, Comparison between experimental data and theorical predictions relating to dependence of solidification cracking on composition, Solidification and casting of metals, Metals Society; 1979, pp. 275.

[Decultieux, 1996] F. Decultieux, Caractérisation du comportement thermomécanique d’alliages de fonderie pendant la solidification, Thèse de l’Ecole des Mines de Paris, 1996.

[Easton, 2004] M. Easton, H. Wang, J. Grandfield, D. StJohn, E. Sweet, An Analysis of the Effect of Grain Refinement on the Hot Tearing of Aluminium Alloys, Institute of Materials Engineering Australasia Ltd, Materials Forum, Volume 28 – 2004

[Fabrègue, 2004] D. Fabrègue, Microstructure et fissuration à chaud lors du soudage laser d'alliages d'aluminium 6000, Thèse de l’Institut National Polytechnique de Grenoble, 2004.

[Gerds, 1976] A. F. Gerds, E.M. Stein, E.E. Fletcher, A.R. Elsea, La crique dans les pièces moulées en acier, Steel Founders’ Society of America, 1976

[Grasso, 2004] P.D. Grasso, Coalescence and mechanical behaviour of semi-solid aluminium alloys in relation to hot tearing, Thèse de l’Ecole Polytechnique Fédérale de Lausanne, 2004

[Kerrouault, 2001] N. Kerrouault, Fissuration à chaud en soudage d’un acier inoxydable austénitique, Thèse du CEA Saclay, 2001.

[Ludwig, 2004] O. Ludwig, Etude expérimentale et modélisation du comportement rhéologique d’alliages Al-Cu en cours de solidification dans le cas de la fissuration à chaud en coulée continue, Thèse de l’Institut National Polytechnique de Grenoble, 2004.

[Miyazaki, 1981] J. Miyazaki, T. Mori, K. Narita, T. Ohnishi, Influence of Deformation on the Internal Crack Formation in Continuously Cast Bloom, Continuous Casting of Steel, Second Process Technology Conference, Vol. 2; Chicago; Ill ; 23-25 Feb. 1981. pp. 35-43. 1981

[Novikov, 1966] II. Novikov, Goryachelomkost tsvetnykh metallov i splavov (Hot shortness of non-ferrous metals and alloys), Moscow: Nauka; 1966. p. 299.

[Olivier, 1976] M. Olivier, La crique à chaud dans l’acier moulé, causes et remèdes, C.T.I.F., Etude U725, 1976.

[Pierer, 2007] R. Pierer, C. Bernhard, C. Chimani, A contribution to hot tearing in the continuous casting process, La Revue de Métallurgie-CIT,pp. 72-83, Février 2007

[Place, 1995] J.L. Place, Défaut de crique dans l’acier moulé, 95 F 005, Aciéries Delachaux, Association Technique de Fonderie, 1995.

[Rappaz, 1999] M. Rappaz, JM. Drezet, M. Gremaud, A new hot-tearing criterion, Metall Mater Trans A, 1999, Vol.30A, pp.449-456.

[Trubitsyn, 1958] N.V. Trubitsyn, P.N. Bidulya, Influence of the Composition of Steel on the Formation of Hot Cracks in the castings, Liteinoe Proizvodstvo, n°6, 1958, pp. 22-26.

[Wanin, 2002] M. Wanin, Évaluation non destructive de la qualité des matériaux (partie 2), Techniques de l’Ingénieur, M 4 131, pp.1-16, 2002

Bibliographie Chapitre 4 :

[Bobadilla, 1988] M. Bobadilla, B. Chamont, C. Gatellier, J.M. Jolivet, Etude de la fragilité à la solidification d’aciers au carbone, Commission des Communautés Européennes, Convention n°7210-CA/316, RE 88/023, 1988.

[Bobadilla, 1993] M. Bobadilla, M. Niederlaender, C. Nuss, G. Perrin, et J. Sélaries, Données thermophysiques utilisées dans les modèles thermiques de solidification en coulée continue, pour différentes nuances d’aciers. Rapport Interne, IRSID, 1993.

[Clyne, 1979] T.W. Clyne, GJ. Davies, Comparison between experimental data and theorical predictions relating to dependence of solidification cracking on composition, Solidification and casting of metals, Metals Society; 1979, pp. 275.

[Costes, 2004] F. Costes, Modélisation thermomécanique tridimensionnelle par éléments finis de la coulée continue d’aciers, Thèse de l’Ecole des Mines de Paris, 2004.

[Decultieux, 1996] F. Decultieux, Caractérisation du comportement thermomécanique d’alliages de fonderie pendant la solidification, Thèse de l’Ecole des Mines de Paris, 1996.

[Heinrich, 2003] A. Heinrich, Modélisation Bidimensionnelle de la coulée continue d'acier. Thèse de doctorat, École Nationale Supérieure des Mines de Paris, 2003.

[Hiroux, 2002] B. Hiroux, Identification automatique de Résistances Thermiques de Contact par une analyse inverse basée sur une méthode d’éléments finis, rapport de stage, Ecole Nationale Supérieure des Mines de Paris, septembre 2002.

[Jaouen, 1998] O. Jaouen, Modélisation Tridimensionnelle par éléments finis pour l’analyse thermo-mécanique du refroidissement des pièces–moules, Thèse de l’École Nationale Supérieure des Mines de Paris, 1998.

[Kozlowski, 1992] P.F. Kozlowski, B. G. Thomas, J. A. Azzi, et H. Wang, Simple constitutive equations for steel at high temperature, Metall. Trans. A, 23A, pp. 903–918, 1992.

[OSC, 2002] OSC, rapport n°2, Optimisation des systèmes de coulée, mars 2002

[OSC, 2003] OSC, rapport n°3, Optimisation des systèmes de coulée, 2003

[Prokhorov, 1962] NN. Prokhorov, Russian Castings Production 1962;2:172.

[Rappaz, 1999] M. Rappaz, JM. Drezet, M. Gremaud, A new hot-tearing criterion, Metall Mater Trans A, 1999, Vol.30A, pp.449-456.

[Triolet, 2005] N. Triolet, literature survey about critical strain or stress into the mushy zone that affect the slabs internal soundness, Rapport interne Arcelor Research n°IRD/OI/2005/1065, juin 2005.

[Won, 2000] YM. Won, TJ. Yeo , DJ. Seol, KH. Oh, a new criterion for internal crack formation in continuously cast steels, Metall Mater Trans B, 2000, Vol.31B, pp.779-794.

[Yamanaka, 1991] A. Yamanaka, K. Nakajima, K. Yasumoto, H. Kawashima, K. Nakai, Mesurement of critical strain for solidification cracking, Model. Cast. Weld. Adv. Solidification processes V, ed. M. Rappaz, Min. Met. Mat. Society, 1991, pp.279

Bibliographie Chapitre 5 :

[Bobadilla, 1984] M. Bobadilla, J.M. Jolivet, D. Tromp, J.P. Birat, M. Larrecq, Prévision des criques internes en coulée continue, Projet de rapport final, Recherche DDSTI n° 81/P 0674, IRSID, 1984.

[Bobadilla, 1988] M. Bobadilla, B. Chamont, C. Gatellier, J.M. Jolivet, Etude de la fragilité à la solidification d’aciers au carbone, Commission des Communautés Européennes, Convention n°7210-CA/316, RE 88/023, 1988.

[Clyne, 1979] T.W. Clyne, GJ. Davies, Comparison between experimental data and theorical predictions relating to dependence of solidification cracking on composition, Solidification and casting of metals, Metals Society; 1979, pp. 275.

[Drezet, 2002] J.-M. Drezet, M. Gremaud, R. Graf, M. Gaumann, A new hot tearing criterion for steel, Proceedings of the 4th European Continuous Casting Conference, Birmingham, UK, 2002

[Miyazaki, 1981] J. Miyazaki, T. Mori, K. Narita, T. Ohnishi, Influence of Deformation on the Internal Crack Formation in Continuously Cast Bloom, Continuous Casting of Steel, Second Process Technology Conference, Vol. 2; Chicago; Ill ; 23-25 Feb. 1981. pp. 35-43, 1981

[Nagaumi, 2006] H Nagaumi, S Suzhuki, T Okane, T Umeda, Effect of Fe Content on Hot Tearing of High-Strength Al-Mg-Si Alloy¸ Mat. Trans., Vol. 47, 2206, pp. 2821-2827

[Pierer, 2007] R. Pierer, C. Bernhard, C. Chimani, A contribution to hot tearing in the continuous casting process, Rev. Met. Paris, N°2 (February 2007), pp. 72-83, 2007

[Prokhorov, 1962] NN. Prokhorov, Russian Castings Production, pp.2-172,1962.

[Rappaz, 1999] M. Rappaz, JM. Drezet, M. Gremaud, A new hot-tearing criterion, Metall Mater Trans A, 1999, Vol.30A, pp.449-456.

[Saveiko, 1961] VN. Saveiko, Theory of hot tearing, Russ Cast Prod: 453–456 12, 1961.

[Seol, 2002] D.J. Seol, K.H. Oh, J.W. Cho, J. Lee U. Yoon, Phase-field modelling of the thermo-mechanical properties of carbon steels, Acta Materiala 50, pp.2259-2268, 2202

[Suyitno, 2002] Suyitno, WH. Kool, L. Katgerman, Micro-mechanical model at triple junctions in DC casting, Light metals, Mat Sci Forum, 2002, Vol.396–402, pp.179.

[Wintz, 1994] M. Wintz, M. Bobadilla, J.M. Jolivet, Fragilité à la solidification des acier : influence du carbone, du soufre et du phosphore, La revue de Métallurgie-CIT, 1994.

[Won, 2000] YM. Won, TJ. Yeo , DJ. Seol, KH. Oh, a new criterion for internal crack formation in continuously cast steels, Metall Mater Trans B, 2000, Vol.31B, pp.779-794.

[Wünnenberg, 1985] K. Wünnenberg, R. Flender, Investigation of Internal-Crack Formation in Continuous-Casting, Using a Hot Model, Ironmaking Steelmaking. Vol. 12, no. 1, pp. 22-29. 1985

[Yamanaka, 1991] A. Yamanaka, K. Nakajima, K. Yasumoto, H. Kawashima, K. Nakai, Mesurement of critical strain for solidification cracking, Model. Cast. Weld. Adv. Solidification processes V, ed. M. Rappaz, Min. Met. Mat. Society, 1991, pp.279

Bibliographie Conclusion :

[Bernacki, 2007] M. Bernacki, Y. Chastel, H. Digonnet, H. Resk, T. Coupez, R.E. Logé, Development of numerical tools for the multiscale modelling of recrystallization in metals, based on a digital material framework, Computer Methods in Materials Science 7, 2007, pp. 142-149.

[Hamide, 2007] M. Hamide, E. Massoni, M. Bellet, Adaptive mesh technique for thermalmetallurgical numerical simulation of arc welding processes, International Journal for Numerical Methods in Engineering, 2007.

[Henri, 2008] M. Henri, Modélisation 3D par éléments finis du refroidissement primaire lors de la coulée continue d’aciers, Thèse de l’Ecole des Mines de Paris, 2008.

[Vernède, 2006] S. Vernède, Ph. Jarry, M. Rappaz, A granular model for mushy zones: application to hot tearing, Proc. 11th Conf. on Modeling of Casting, Welding and Advanced Solidification Processes, Ed. Gandin & Bellet, TMS, 2006, pp. 635-642.

Table of content

Introduction

Problématique

Approche proposée

Chapitre 1 : Introduction à la fissuration à chaud

I. Problématique industrielle

II. La rupture à chaud dans les aciers

III. Critères de rupture à chaud

IV. Caractérisation de la rupture à chaud.

V. Conclusion.

Références bibliographiques

Chapitre 2 : Conception d’un essai de solidification contrariée : l’essai Crickacier

I. Définition d’un nouveau moyen d’essai

II. Conception de l’essai

III. Discussion

IV. Bilan de la conception

Références bibliographiques

Chapitre 3 : Campagne expérimentale et analyse des résultats expérimentaux

I. Introduction .

II. Campagne expérimentale

III. Analyse de l’influence qualitative des paramètres 'procédé'

IV. Observations expérimentales de la ‘criquabilité’

V. Discussion

VI. Conclusion.

Références bibliographiques

Chapitre 4 : Modélisation de la fissuration à chaud.

I. Présentation du logiciel THERCAST®.

II. Modélisation de la fissuration à chaud

III. Modélisation de l’essai Crickacier

IV. Etudes numériques de différentes configurations .

V. Discussion

VI. Conclusion.

Références bibliographiques

Chapitre 5 : Analyse thermomécanique de l’essai de cintrage de lingots

I. Description de l’essai

II. Résultats expérimentaux

III. Modélisation numérique de l’essai de cintrage

IV. Analyse critique des critères de fissuration à chaud

V. Discussion.

VI. Conclusion

Références bibliographiques

Conclusion et perspectives

Bilan du travail réalisé

Applications et perspectives

Références bibliographiques

Statistiques de consultation

Repository Staff Only: edit this item