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Influence du niobium sur la microstructure et les propriétés d'usage des aciers inoxydables austéno-ferritiques (duplex)

Abstract : Stainless steels are used in some industries requiring mechanicalproperties and corrosion resistance. Lean duplex have higher corrosionresistance and mechanical properties than the austenitic stainless steels.However, their machinability is below that of the corresponding austeniticstainless steels. To improve it, some elements can be added in thegrade, like niobium. The aim of this study is to increase machinability oflean duplex grades without degrading their other properties. Differentcontents of niobium were tested in a 1.4362 to understand how thiselement affects the microstructure, the toughness and the pittingcorrosion resistance. With these results optimum niobium content isdefined. Turning and toughness experiments were done on industrial1.4362 grades with and without niobium and with different heatstreatments in order to understand how niobium can influence theseproperties.
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Christophe Baumhauer. Influence du niobium sur la microstructure et les propriétés d'usage des aciers inoxydables austéno-ferritiques (duplex). Autre. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENI087⟩. ⟨tel-01726972⟩

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