Ductility of TRIPAided Bainitic Steels（的延性TRIPAided贝氏体钢）.pdfVIP

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Ductility of TRIPAided Bainitic Steels（的延性TRIPAided贝氏体钢）.pdf

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Ductility of TRIPAided Bainitic Steels（的延性TRIPAided贝氏体钢）

Design of Cold Rolled and Continuous Annealed Carbide-Free Bainitic Steels for Automotive Application F.G. Caballeroa b a b a , S. Allain , J. Cornide , J.D. Puerta Velásquez , C. Garcia-Mateo and M.K. Millerc a Spanish National Center for Metallurgical Research (CENIM-CSIC), Avda Gregorio del Amo, 8; Madrid, E-28040, Spain, fgc@cenim.csic.es; jca@cenim.csic.es; cgm@cenim.csic.es b ArcelorMittal Maizieres Research SA, Voie Romaine, BP30320, 57283 Maizières-lès-Metz Cedex, France, sebastien.allain@; juan -david.puerta- velasquez@ c Oak Ridge National Laboratory (ORNL), Materials Science and Technology Division; Oak Ridge, TN 37831-6139, millermk@ Corresponding Author: F.G. Caballero Spanish National Center for Metallurgical Research (CENIM-CSIC) Av. Gregorio del Amo, 8 28040 MADRID Spain Tlf: +34 91 553 89 00 (Ext 373) Fax +34 91 534 7425 E-mail: fgc@cenim.csic.es Abstract Advanced high strength steels for automotive applications were designed to achieve a carbide-free bainitic microstructure after conventional thermo-mechanical processing and a continuous annealing treatment. The microstructure obtained consists of ferrite laths interwoven with thin films of untransformed retained austenite. The sufficiently tough matrix and the control of the heterogeneity in the microstructure will allow an optimum combination of strength, ductility, and formability to be achieved. The designed steels reached far higher uniform elongations than that in commercial dual phase steels and martensitic steels with the same range of ultimate tensile strengths. Their formability was found to be appropriate for the