Papers by Leonardo Godefroid
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Engineering Failure Analysis, Aug 1, 2016
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ABM Proceedings, Jun 1, 2022
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Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, Oct 1, 2020
Abstract UNS S41003 (410D) steel is a relatively low chromium unstabilized ferritic stainless ste... more Abstract UNS S41003 (410D) steel is a relatively low chromium unstabilized ferritic stainless steel. It has superior mechanical and corrosion resistance than ordinary low carbon steels. Therefore, and for its relatively low cost among specialty steels, it is a strong candidate for replacement of low carbon common steels in many applications. In order to enable new applications for this steel, it is important to ensure good performance in relation to its mechanical strength, so the development of hardening mechanisms without significant loss of ductility is desirable. Dual-phase microstructures are an example that fits in this context, because they tend to increase mechanical strength and are favorable to the fracture toughness and fatigue resistance of steels. This research evaluated the influence of quenching heat treatments after intercritical austenitizing on the microstructure, tensile strength, hardness, fracture toughness (J x Δa curves) and fatigue crack growth resistance (da/dN x ΔK curves) of a 410D ferritic stainless steel. The used intercritical austenitization temperatures were defined based on its critical temperatures Ac1 and Ac3 measured by dilatometry. Ten different quenching heat treatments were performed, varying the austenitizing temperature and time, in order to obtain dual-phase microstructures (ferrite and martensite) with different volume fractions of constituents. The obtained results revealed that the increase of the austenitizing temperature and time favor the increase of the martensite volume fraction in the microstructure. Higher martensite volume fractions imply greater hardness and mechanical tensile and fatigue strength of the steel, but with loss of ductility and fracture toughness. The best balance among the studied mechanical properties was presented by steel treated at 825 °C for 15min, containing 57% of martensite.
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Materials Research-ibero-american Journal of Materials, 2023
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Procedia Materials Science, 2014
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Engineering Failure Analysis, Dec 1, 2015
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Soldagem e Inspeção, Sep 1, 2015
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Soldagem e Inspeção, 2020
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Soldagem e Inspeção, 2019
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ABM Proceedings, 2018
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ABM Proceedings, 2018
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Welding Journal, 2020
The welded joints of duplex stainless steels (DSSs) have been widely used in petrochemical, nucle... more The welded joints of duplex stainless steels (DSSs) have been widely used in petrochemical, nuclear, pulp, and paper industries. Welds require a good, superficial finishing and a combination of mechanical and corrosion properties in these types of high-quality, demanding applications. Even though laser welding promotes narrow weld beads and a small heat-affected zone, when it is applied to DSSs, it can produce dangerous microstructural discontinuities. In this context, the effects of subsequent heat treatments on the microstructure, corrosion resistance, microhardness, and tensile proper-ties of DSS laser-welded joints are investigated. In this study, samples of UNS S32304 DSS were submitted to two different conditions of laser welding. Subsequently, the plates submitted to the best welding condition were subjected to isothermal heat treatments at different temperatures (850°, 950°, 1050°, and 1150°C) for 10 min. Then they were microstructurally characterized. Phase fraction measure...
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Proceedings of the 25th International Congress of Mechanical Engineering, 2019
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ABM Proceedings, 2019
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ABM Proceedings, 2019
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ABM Proceedings, 2013
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Papers by Leonardo Godefroid