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NanoMat 2018 Nano Research & Applications
ISSN: 2471-9838 Page 68
April 26-27, 2018
Rome, Italy
17th Edition of International Conference on
Emerging Trends in
Materials Science and
Nanotechnology
In the present work, a new method combining surface
nanocrystallisation treatment (SMAT) and the co-rollingprocess is
presented. The aimof 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 and three point bending tests have
beencarriedout.Aspecialattentionwasgrantedtotheinspectionof
the interface bonding quality of the co-rolled composite laminates.
Furthermore, optical and electron microscope observations were
carried out to determine the correlation between the mechanical
response, the microstructure and the appearance of the interfaces.
Mechanical tests andmicrostructural observations have shown the
presence of oxides at the laminate interfaces (Figure 1). It appears
that the thermomechanical treatment carried out at 650°C leads to
a bad junction at the interfaces, which has a detrimental effect on
the mechanical strength of the structures. Moreover, the question
of maintaining the nanostructured layers after thermomechanical
treatment arises.
Figure1: Optical microscopy observations performed on co-rolled samples
after electrolytic polishing and heat treatment of: a) and b) 550°C; a’) and b’)
650 °C.
Recent Publications
1. K. Lu, J. Lu, Surface nanocrystallization (Snc) of metallic
materials - presentation of the concept behind a new approach,
J. Mater. Sci. Technol. 15 (1999) 193-197.
2. K. Lu, J. Lu, Nanostructured surface layer on metallic materials
induced by Surface Mechanical Attrition Treatment, Mater. Sci.
Eng. A 375-377 (2004) 38-45.
3. T. Roland, D. Retraint, K. Lu, J. Lu: Generation of nanostructures
on 316L stainless steel and its effect on mechanical behavior,
Mater. Sci. Forum 490-491 (2005) 625-630.
4. D. Retraint, Effect of a superficial nanostructured layer on
the mechanical properties of metallic parts, Matériaux &
Techniques 99 (2011) 101-104.
5. L.Waltz, P. Kanouté, D. Retraint, “Mechanical characterizationof
a SMATed 316L stainless steel: use of cyclic nanoindentation”,
European Congress on Advanced Materials and Processes
(Euromat 2011), Montpellier, 12-15 September 2011.
6. D. Retraint, Z. Quadir, W. Xu, L. Waltz, M. Ferry, “Microstructural
investigation of roll bonded nanocrystalline stainless steel
sheets”, The 16th International Conference on the Textures
of Materials (ICOTOM 16), Bombay (India), 12-17 December
2011.
Biography
After getting an engineer diploma in mechanical engineering and a master of
science from the High Institute of Aeronautics and Space in Toulouse (France),
Laurent Waltz started a PhD thesis on the development of nanocrystallized
structures presenting high mechanical strength at the University of Technol-
ogy of Troyes. He is currently associate professor at the Laboratory of Me-
chanics and Civil Engineering of Montpellier University where he works on the
characterization of materials with gradient properties using optical means.
Experimental characterization of 316L nanocristallized
multilayer structure
Laurent Waltz1, Delphine Retraint2 and Arjen Roos3
1Associate Professor, LMGC, Univ. Montpellier, CNRS, Montpellier, France
2Full Professor, ICD, P2MN, LASMIS, University of Technology of Troyes (UTT), UMR 6281, CNRS –
Troyes, France
3Researcher, ICD, P2MN, LASMIS, University of Technology of Troyes (UTT), UMR 6281, CNRS –
Troyes, France
Laurent Waltz et al., Nano Res Appl, Volume:4
DOI: 10.21767/2471-9838-C1-009