Laser treatment of 430 ferritic stainless steel for enhanced mechanical properties
Article dans une revue avec comité de lecture
Thin AISI 430 ferritic stainless steel sheets containing 18% Cr were hardened by continuous-wave laser beams under different conditions. A symmetric double laser treatment platform was developed to operate two lasers simultaneously in order to achieve a homogenous microstructure through the specimen and avoid the overheating associated with single laser treatments on one surface. The influence of linear energy density and shielding gas on microstructure and hardness is investigated for both single and double laser treatments. Tensile behavior and oxidation effect during treatment are also studied. With a peak temperature around Tm, the single-track laser yields local microhardness that is 90% higher than the base material, while samples completely treated by the multi-track laser present a 60% increase in yield stress and 45.8% in ultimate tensile stress. These improvements in mechanical behaviors are driven by the formation of martensite and chromium carbides upon rapid cooling despite poor carbon content and dramatic grain coarsening. These results could be useful in order to locally modify the behavior of medium chrome ferritic stainless steel to meet industrial
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Article dans une revue avec comité de lectureWANG, Zhige; DIRRENBERGER, Justin; LAPOUGE, Pierre; DUBENT, Sébastien (Elsevier BV, 2022)Thin AISI 430 ferritic stainless steel sheets containing 18% Cr were hardened by continuous-wave laser beams under different conditions. A symmetric double laser treatment platform was developed to operate two lasers ...
Microstructure Evolution and Mechanical Properties of AISI 430 Ferritic Stainless Steel Strengthened Through Laser Carburization Article dans une revue avec comité de lectureWANG, Zhige; DIRRENBERGER, Justin; LAPOUGE, Pierre; DUBENT, Sébastien; JABIR, Hamza; MICHEL, Vincent (ASME International, 2022-08-08)Carburization assisted by laser processing is a promising method to strengthen metallic materials. Direct laser beam carburization is implemented for the first time on thin AISI 430 ferritic stainless steel (FSS) sheets ...
Article dans une revue avec comité de lectureLAPOUGE, Pierre; DIRRENBERGER, Justin; COSTE, Frédéric; SCHNEIDER, Matthieu (Elsevier, 2019)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 ...
Isogeometric shape optimization of smoothed petal auxetic structures via computational periodic homogenization Article dans une revue avec comité de lectureWANG, Zhen-Pei; POH, Leong Hien; DIRRENBERGER, Justin; ZHU, Yilin; FOREST, Samuel (Elsevier, 2017)An important feature that drives the auxetic behaviour of the star-shaped auxetic structures is the hinge-functional connection at the vertex connections. This feature poses a great challenge for manufacturing and may lead ...
Article dans une revue avec comité de lectureWANG, Zhen-Pei; POH, Leong Hien; ZHU, Yilin; DIRRENBERGER, Justin; FOREST, Samuel (Elsevier, 2019)This paper focuses on a systematic isogeometric design approach for the optimal petal form and size characterization of tetra-petals auxetics, considering both plane stress and plane strain conditions. The underlying ...