Laser heat treatment of martensitic steel and dual-phase steel with high martensite content
TypeArticles dans des revues avec comité de lecture
Laser heat treatment of galvanised steels with a martensite content superior to 80% were performed on a 1 cm wide area over an extensive temperature range [620 K - 1350 K]. The material softening induced is studied through uniaxial tensile testing and SEM microstructural observation. A treatment temperature close to Ac3 yields a massive increase in the ductility of the specimens while reducing the mechanical strength. This change in mechanical properties is associated with the nucleation of new austenite islands and the vanishing of the initial martensite laths. The results presented in this paper pave the way to localised variations of the strength-ductility trade-off, which could be useful for several industrial applications, particularly for enabling plastic forming or stamping of the martensitic steel sheets at low temperature.
Fichier(s) constituant cette publication
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Visualiser des documents liés par titre, auteur, créateur et sujet.
Experimental analysis of spatter generation and melt-pool behavior during the powder bed laser beam melting process GUNENTHIRAM, V; PEYRE, P; SCHNEIDER, MATTHIEU; DAL, Morgan; COSTE, Frédéric; KOUTIRI, Imade; FABBRO, Rémy (Elsevier, 2018)The experimental analysis of spatter formation was carried out on an instrumented SLM set-up allowing the quantification of spatter ejections and possible correlation with melt-pool behavior. Considering nearly similar SLM ...
Analysis of laser–melt pool–powder bed interaction during the selective laser melting of a stainless steel GUNENTHIRAM, Valérie; PEYRE, Patrice; SCHNEIDER, Matthieu; DAL, Morgan; COSTE, Frédéric; FABBRO, Rémy (Laser Institute of America, 2017)The laser powder bed fusion (LPBF) or powder-bed additive layer manufacturing process is now recognized as a high-potential manufacturing process for complex metallic parts. However, many technical issues are still to ...
Analysis and possible estimation of keyhole depths evolution, using laser operating parameters and material properties FABBRO, Rémy; DAL, Morgan; PEYRE, Patrice; COSTE, Frédéric; SCHNEIDER, Matthieu; GUNENTHIRAM, V (Laser Institute of America, 2018)The authors propose an analysis of the effect of various operating parameters on the keyhole depth during laser welding. The authors have developed a model that uses the analysis of the thermal field obtained in 2D geometry, ...
Laser based method for surface tension and density measurements for liquid refractory metals (Nb, Ta, and W) DAL, Morgan; COSTE, Frédéric; SCHNEIDER, Matthieu; BOLIS, Riccardo; FABBRO, Rémy (Laser Institute of America, 2019)The increase of process simulations in industry leads to the need of accurate knowledge of material thermal properties. As the determination of liquid metal properties is quite difficult, this article presents an experimental ...
PHIPPS, Claude R.; BONNAL, Christophe; MASSON, Frédéric; BOUSTIE, Michel; BERTHE, Laurent; SCHNEIDER, Matthieu; BATON, Sophie D; BRAMBRINK, Erik; CHEVALIER, Jean Marc; VIDEAU, Laurent; BOYER, Séverine A.E (Elsevier Ltd, 2018)New data on some materials at 80ps pulse duration and 1057 nm wavelength give us the option of proportionally combining them to obtain arbitrary values between 35 (aluminum) and 800 N/MW (POM, polyoxymethylene) for momentum ...