High Strength Nanocrystallized Multilayered Structure Obtained by Smat and Co-rolling

Laurent Waltz (1) , Delphine Retraint (1) , Arjen Roos (1) , Patrick Olier (2) , Jian Lu (3)

1 LASMIS - Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée
2 LTMEx - Laboratoire des Technologies des Matériaux EXtrêmes
3 Department of Mechanical Engineering [Hong Kong]

In the present study, a method is presented combining surface nanocrystalline treatment (SMAT) and the co-rolling process. The aim of this duplex treatment is the development of a 316L stainless steel semi-massive multilayered bulk structure with improved yield and ultimate tensile strengths, while conserving an acceptable elongation to failure by optimizing the volume fraction and distribution of the nano-grains in the laminate. To characterize this composite structure, tensile tests as well as sharp nanoindentation tests were carried out to follow the local hardness evolution through the cross-section of the laminate. Furthermore, transmission electron microscope (TEM) observations were carried out to determine the correlation between the microstructure, the local hardness and the mechanical response of the structure.

Mots clés: Nanocrystalline materials; SMAT; Co-rolling; Multilayered structure; Mechanical properties

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

Laurent Waltz, Delphine Retraint, Arjen Roos, Patrick Olier, Jian Lu. High Strength Nanocrystallized Multilayered Structure Obtained by Smat and Co-rolling. Materials Science Forum, 2009, 614, pp.249-254. ⟨10.4028/www.scientific.net/MSF.614.249⟩. ⟨hal-00720659⟩