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Effect of structural state and surface finishing on corrosion behavior of 1.4970 austenitic steel at 400 and 500 ?C in flowing Pb-Bi eutectic with dissolved oxygen

[+] Author and Article Information
Valentyn Tsisar

Karlsruhe Institute of Technology (KIT) Institute for Applied Materials – Applied Materials Physics (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
valentyn.tsisar@kit.edu

Carsten Schroer

Karlsruhe Institute of Technology (KIT) Institute for Applied Materials – Applied Materials Physics (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
carsten.schroer@kit.edu

Olaf Wedemeyer

Karlsruhe Institute of Technology (KIT) Institute for Applied Materials – Applied Materials Physics (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
olaf.wedemeyer@kit.edu

Aleksandr Skrypnik

Karlsruhe Institute of Technology (KIT) Institute for Applied Materials – Applied Materials Physics (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
aleksandr.skrypnik@kit.edu

Jürgen Konys

Karlsruhe Institute of Technology (KIT) Institute for Applied Materials – Applied Materials Physics (IAM-AWP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
juergen.konys@kit.edu

1Corresponding author.

ASME doi:10.1115/1.4040422 History: Received September 27, 2017; Revised May 22, 2018

Abstract

Effect of structural state (solution annealed and after 40% cold work) and surface finishing (turning, grinding, polishing) on the corrosion behavior of austenitic 1.4970 (15 15 Ti) steel in flowing (2 m/s) Pb-Bi eutectic containing 1E-7 mass% dissolved oxygen at 400°C and 1E-6 mass% O at 500°C is investigated. At 400°C for ~13000 h, the corrosion losses are minor for steel in both structural states and for surfaces finished by turning and grinding - a thin Cr-based oxide film is formed. In contrast, the polished surface showed initiation of solution-based corrosion attack with the formation of iron crystallites and preferential propagation along the grain boundaries. The depth of corrosion attack does not exceed 10 µm after ~13000 h. At 500°C for 2000 h, the samples in both structural states showed general slight oxidation. Cold-worked steel underwent a severe groove-type and pit-type solution-based attack of 170 µm in maximum depth while the solution annealed sample showed only sporadic pit-type corrosion attack to the depth of 45 µm in maximum.

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