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Corrosion in iron and steel T91 caused by flowing lead?bismuth eutectic at 400 ?C and 10?7 mass% dissolved oxygen

[+] Author and Article Information
Carsten Schroer

Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
carsten.schroer@kit.edu

Valentyn Tsisar

Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
valentyn.tsisar@kit.edu

Adeline Durand

Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
adeline.durand@rub.de

Olaf Wedemeyer

Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
olaf.wedemeyer@kit.edu

Aleksandr Skrypnik

Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
aleksandr.skrypnik@kit.edu

Jürgen Konys

Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
juergen.konys@kit.edu

1Corresponding author.

ASME doi:10.1115/1.4040937 History: Received November 27, 2017; Revised July 16, 2018

Abstract

Specimens produced from technically pure iron and two different heats of ferritic/martensitic steel T91 were exposed to oxygen-containing flowing lead-bismuth eutectic (LBE) at 400 °C, 10-7 mass% dissolved oxygen and flow velocity of 2 m/s, for exposure times between around 1000 and 13,000 h. The occurring phenomena were analyzed and quantified using metallographic cross sections prepared after exposure. While pure iron mostly shows solution underneath or in the absence of a detached and buckled oxide scale, solution in T91 occurs only in a few spots on the sample surface. However, in the case of one of the investigated heats, a singular event of exceptionally severe solution-based corrosion was observed. The results are compared especially with findings at 450 and 550 °C and otherwise similar conditions as well as austenitic steels tested in the identical experimental run.

Copyright (c) 2018 by ASME
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