New developments of advanced high-strength steels for automotive applications

Jean-Hubert Schmitt; Thierry Iung

doi:10.1016/j.crhy.2018.11.004

New developments of advanced high-strength steels for automotive applications

Jean-Hubert Schmitt ¹ ; Thierry Iung ²

¹ MSSMat, CNRS, Centrale Supélec, Université Paris-Saclay, 91190 Gif-sur-Yvette, France
² ArcelorMittal Global R&D – Maizières, Voie Romaine, 57283 Maizières-lès-Metz, France

Comptes Rendus. Physique, Volume 19 (2018) no. 8, pp. 641-656.

Abstract
Résumé

Automotive industry asks for higher resistant steels to lighten parts and improve crash resistance. Keeping a good ductility while increasing tensile strength requires the development of new grades in which hardening mechanisms counteract the drop in elongation when enhancing mechanical resistance. This is mainly achieved with multiphase steels and completing dislocation hardening by twinning and martensite transformation during straining. This has led to high-strength steel families, some of them being already used in body in white (Dual Phase (DP) and TRIP steels). Others, still in development, will soon emerge on the market (Quenched and Partitioned (Q&P), medium-Mn steels or TWIP).

L'industrie automobile demande des aciers plus résistants pour alléger les pièces et améliorer la résistance aux chocs. Le maintien d'une bonne ductilité tout en augmentant la résistance à la traction nécessite le développement de nouvelles nuances dans lesquelles les mécanismes de durcissement compensent la baisse de l'allongement en augmentant la résistance mécanique. Ceci est principalement réalisé avec des aciers multiphasés et en complétant le durcissement par dislocation par du maclage et une transformation martensitique pendant la déformation. Ceci a donné naissance à des familles d'aciers à haute résistance dont certaines sont déjà utilisées pour la caisse en blanc (aciers Dual Phase (DP) et TRIP). D'autres, encore en cours de développement, apparaîtront bientôt sur le marché (aciers trempés et partitionnés (Q&P), aciers à moyenne teneur en manganèse ou TWIP).

Published online: 2018-11-28

DOI: 10.1016/j.crhy.2018.11.004

Keywords: Advanced high-strength steels, TRIP steels, TWIP steels, Q&P steels, Medium-Mn steels, Automotive applications
Mot clés : Aciers à très haute résistance, Aciers TRIP, Aciers TWIP, Procédé Q&P, Aciers moyen Mn, Application automobile

Author's affiliations:

Jean-Hubert Schmitt ¹; Thierry Iung ²

¹ MSSMat, CNRS, Centrale Supélec, Université Paris-Saclay, 91190 Gif-sur-Yvette, France
² ArcelorMittal Global R&D – Maizières, Voie Romaine, 57283 Maizières-lès-Metz, France

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Jean-Hubert Schmitt; Thierry Iung. New developments of advanced high-strength steels for automotive applications. Comptes Rendus. Physique, Volume 19 (2018) no. 8, pp. 641-656. doi : 10.1016/j.crhy.2018.11.004. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2018.11.004/

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