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Création de surfaces poreuses sur des aciers inoxydables par réduction d’oxydes sous H2 à haute température

Abstract : A process for pore creation on the surface of two stainless steels, respectively austenitic and ferritic, has been investigated. That process follows two steps. An oxide scale with controlled thickness and composition is firstly generated by water vapour exposition at 1100 °C. That layer is subsequently reduced at high temperature by dihydrogen. The present work aims to better understand the mechanisms of pore formation and the influence of various reaction parameters on both oxidation and reduction course.A comprehensive characterisation of the oxide layers has been first performed. The main parameter is the alloy structure, austenitic or ferritic. The porous surfaces have been thereafter studied to establish step by step the formation mechanisms involved.It was demonstrated that the non-stoichiometry of iron oxides formerly developed on the austenitic steel is behind the pore growth mechanism on that steel.A new kind of porosity could be obtained through the preliminary building of chromium-rich oxide scales on the ferritic steel. The morphologies are in that case completely different as well as the pore formation mechanism. A specific process for the pore growth has been proposed.
Keywords : Surface Steel Porosity
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Submitted on : Thursday, December 15, 2016 - 12:15:09 PM
Last modification on : Wednesday, November 17, 2021 - 12:28:19 PM
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  • HAL Id : tel-01417122, version 1


Valentin Badin. Création de surfaces poreuses sur des aciers inoxydables par réduction d’oxydes sous H2 à haute température. Matériaux. Université Paris sciences et lettres, 2016. Français. ⟨NNT : 2016PSLEM009⟩. ⟨tel-01417122⟩



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