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Research Papers

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,
Eggenstein-Leopoldshafen 76344, Germany
e-mail: 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,
Eggenstein-Leopoldshafen 76344, Germany
e-mail: 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,
Eggenstein-Leopoldshafen 76344, Germany
e-mail: 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,
Eggenstein-Leopoldshafen 76344, Germany
e-mail: 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,
Eggenstein-Leopoldshafen 76344, Germany
e-mail: juergen.konys@kit.edu

1Corresponding author.

Manuscript received September 27, 2017; final manuscript received May 22, 2018; published online September 10, 2018. Editor: Igor Pioro.

ASME J of Nuclear Rad Sci 4(4), 041001 (Sep 10, 2018) (11 pages) Paper No: NERS-17-1131; doi: 10.1115/1.4040422 History: Received September 27, 2017; Revised May 22, 2018

The effect of structural state (solution annealed (SA) and after 40% cold work (CW)) and surface finishing (turning, grinding, and polishing) on the corrosion behavior of austenitic 1.4970 (15-15 Ti) steel in flowing (2 m/s) Pb-Bi eutectic containing 10−7 mass% dissolved oxygen at 400 °C and 10−6 mass% O at 500 °C is investigated. At 400 °C for ∼13,000 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 ∼13,000 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 SA sample showed only sporadic pit-type corrosion attack to the depth of 45 μm in maximum.

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Figures

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Fig. 1

Electron back scatter diffraction map showing microstructure of 1.4970 steel in (a) SA state and (b) after 40% CW

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Fig. 2

Length of boundaries in 1.4970 steel in SA and CW state depending on the grain boundary type: LAB, HAB, and CSLB (Σ3)

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Fig. 3

Grain size distribution in 1.4970 steel in SA state and after 40% reduction by CW

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Fig. 4

EBSD kernel average misorientation map with third nearest-neighbor kernels

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Fig. 5

Experimental parameters of corrosion tests

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Fig. 6

Surface morphology of samples exposed at 400 °C to flowing Pb-Bi eutectic (∼2 m/s) with 10−7 mass% dissolved oxygen for 4746 h depending on the initial surface finishing

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Fig. 7

Typical Auger spectrum obtained from the sputter-cleaned surfaces initially turned and grinded on samples exposed at 400 °C to flowing Pb-Bi eutectic (∼2 m/s) with 10−7 mass% dissolved oxygen for 13,194 h

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Fig. 8

Pitting-type corrosion attack observed locally on the surface of 1.4970 steel samples finished by turning and grinding after exposure at 400 °C to flowing Pb-Bi eutectic (∼2 m/s) with 10−7 mass% dissolved oxygen for 13194 h

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Fig. 9

Corrosion-induced changes in surface morphology on samples of 1.4970 austenitic steel with surface finished by polishing and exposed at 400 °C to flowing Pb-Bi eutectic (∼2m/s) with 10−7 mass% dissolved oxygen depending on the structural state of steel (SA and CW) and time

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Fig. 10

Surface morphology and cross section of samples of 1.4970 austenitic steel in SA and CW states and surface finished by polishing after exposure at 400 °C to flowing Pb-Bi eutectic (∼2 m/s) with 10−7 mass% dissolved oxygen for 4746 h

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Fig. 11

Surface morphology and corresponding Auger spectra obtained from the sample of 1.4970 austenitic steel in 40% CW state exposed at 400 °C to flowing Pb-Bi eutectic (∼2 m/s) with 10−7 mass% dissolved oxygen for 4746 h

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Fig. 12

Surface morphology and cross section of samples of 1.4970 austenitic steel in SA and CW state and finished by polishing after the test at 400 °C in flowing Pb-Bi eutectic (∼2 m/s) with 10−7 mass% dissolved oxygen for 13,194 h

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Fig. 13

The elemental profile obtained along the specified line on across-section of a sample of 1.4970 austenitic steel in SA state and finished by polishing after the test at 400 °C in flowing Pb-Bi eutectic (∼2 m/s) with 10−7 mass% dissolved oxygen for 13,194 h

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Fig. 14

Samples of 1.4970 austenitic steel in SA and 40%CW states after the test at 500 °C in flowing Pb-Bi eutectic (∼2 m/s) with 10−6 mass% dissolved oxygen for ∼2000 h: (a) general view, (b) three-dimensional surface of characteristic segment, and (c) metallographic cross section

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Fig. 15

The microstructure of 1.4970 steel in CW state in the area of severe corrosion attack (Fig. 14 c) formed after the test at 500 °C in flowing Pb-Bi eutectic (∼2 m/s) with 10-6 mass% O for ∼2000 h

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Fig. 16

Elemental profiles obtained along specified lines on cross section of samples of 1.4970 austenitic steel in CW state after the test at 400 °C in flowing Pb-Bi eutectic (∼2 m/s) with 10−6 mass% dissolved oxygen for ∼2000 h

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