Research Assistant & R.O.
Tel. : 02/650.2723 Email : Loic.Malet@ulb.ac.be Technical skills : Transmission Electron Microscopy, Electron Backscatterd Diffraction Mainly two different morphologies of martensite can be obtained in steels depending on the amount of alloying elements. The first morphology, referred to as lath martensite, forms in low alloy, low carbon steels. It is, by far, the most extensively studied form of martensite due to its industrial applications. The second morphology of martensite, referred to as plate martensite, forms in highly alloyed and in high carbon steels and in particular in Fe-High Ni alloys. In this case, the transformation product is disc shaped and internally twinned. This morphology is the only form of martensite that has the potential to exhibit shape memory properties. My work is dedicated to the comprehension of the mechanisms of the martensitic transformation in iron based alloys in general and in the crystallography of the phase transformation in particular. Our research covers both kind of morphologies through the comparative study of TRIP steels, metastable stainless steels (301LN) and Ni-rich iron alloys. The crystallography of the phase transformation is studied at different scales and makes extensive use of EBSD and TEM. Publications : Malet, S. Godet: On the relation between orientation relationships predicted by the phenomenological theory and internaltwinsin plate martensite Scripta Materialia 102(2015)83 R.K. Dutta, L. Malet, H. Gao, M.J.M. Hermans, S. Godet, I.M. Richardson: Formation of nanostructures in severely deformed high-strenght steel induced by high-frequency ultrasonic impact treatment: Metallurgical and Materials transactions A: 46(2015)813 M.-S. Colla, B. Amin-Ahmadi, H. Idrissi, L. Malet, S. Godet, J.-P. Raskin, D. Schryvers, T. Pardoen : Dislocation-mediated relaxation in nanograined columnar palladium films revealed by on-chip time-resolved HRTEM testing : Nature Communications 6(2015)5922 Bernier, L. Bracke, L. Malet, S. Godet: An alternative to the crystallographic reconstruction of austenite in steels: Materials Characterization 89(2014)23-32 Bernier, L. Bracke, L. Malet, S. Godet: Crystallographic recnstruction study of the effects of finish rolling temperature on the variant selection during bainite transformation in C-Mn High-Strenght steels: Metallurgical and materials transactions A: 45(2014)5937 Marechal, L. Malet, S. Godet, C.W. Sinclair: Materials Science Forum: 702(2012)850 Malet, C.W. Sinclair, P.J. Jacques, S; Godet: Grain scale analysis of variant selection during the gamma-epsilon-alpha' phase transformation in austenitic steels: Solid State Phenomena 172(2011)84 Malet, P. J. Jacques, S. Godet, Quantitative Analysis of Variant Selection and Orientation Relationships during the ?-to-? Phase Transformation in Hot-Rolled TRIP Steels: Advanced Materials Research, 89(2010)359 Malet, M.R. Barnett, P.J. Jacques, S. Godet: Variant selection during the ?-to-? phase transformation in hot-rolled bainitic TRIP-aided steels Scripta Materialia 61(2009)520