Viscoplastic behavior of a FeCrAl alloy for high temperature steam electrolysis (HTSE) sealing applications between 700 °C and 900 °C |
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Authors: | P BérardJ-D Bartout M ReytierM Lefrançois J Besson |
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Affiliation: | a Centre des Matériaux, Mines Paristech, CNRS UMR 7633 BP 87, 91003 Evry Cedex, France b Commissariat à l’Énergie Atomique, DRT/LITEN/DTBH/LTH, Grenoble, France c GARLOCK France SAS, Saint-Etienne, France |
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Abstract: | High temperature steam electrolysis (HTSE) is one of the most promising technologies for the industrial production of hydrogen. However one of the remaining problems lies in sealing at high temperature. The reference solution is based on glass seals which presents several drawbacks. That explains why metallic seals are under development. The expected seal will be submitted to creep under low stresses between 700 °C and 900 °C, possibly involving complex loading and thermal history. The candidate material investigated in this work is a FeCrAl (OC404, Sandvik) supplied as a 0.3 mm thick sheet. The ability of this material to develop a protective layer of alumina was studied first, as well as grain size growth during thermal ageing. Creep and tensile tests were performed between 700 °C and 900 °C to determine its mechanical properties. This database was used to propose and identify an elasto-viscoplastic behavior for the material. Creep was described by the Sellars-Tegart law. This law was then used to simulate and predict creep indentation tests performed in the same range of temperatures. |
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Keywords: | FeCrAl alloys Creep Mechanical properties Sellars-Tegart model High temperature electrolysis |
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