Characterization of oxide scales grown on alloy 310S stainless steel after long term exposure to supercritical water at 500 °C

Journal Article · Sat Oct 15 00:00:00 EDT 2016 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2016.09.013· OSTI ID:22689639

Behnamian, Yashar ^[1]; Mostafaei, Amir ^[2]; Kohandehghan, Alireza ^[1]; Amirkhiz, Babak Shalchi ^[3]; Serate, Daniel ^[1]; Zheng, Wenyue ^[3]; Guzonas, David ^[4]; Chmielus, Markus ^[2]; Chen, Weixing ^[1]

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1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9 (Canada)
2. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261 (United States)
3. Canmet MATERIALS, Natural Resources Canada, Hamilton, Ontario L8P 0A5 (Canada)
4. Canadian Nuclear Laboratories, Chalk River Laboratories, Chalk River, Ontario K0J 1J0 (Canada)

The oxide scale grown of static capsules made of alloy 310S stainless steel was investigated by exposure to the supercritical water at 500 °C 25 MPa for various exposure times up to 20,000 h. Characterization techniques such as X-ray diffraction, scanning/transmission electron microscopy, energy dispersive spectroscopy, and fast Fourier transformation were employed on the oxide scales. The elemental and phase analyses indicated that long term exposure to the SCW resulted in the formation of scales identified as Fe{sub 3}O{sub 4} (outer layer), Fe-Cr spinel (inner layer), Cr{sub 2}O{sub 3} (transition layer) on the substrate, and Ni-enrichment (chrome depleted region) in the alloy 310S. It was found that the layer thickness and weight gain vs. exposure time followed parabolic law. The oxidation mechanism and scales grown on the alloy 310S stainless steel exposed to SCW are discussed. - Highlights: •Oxidation of alloy 310S stainless steel exposed to SCW (500 °C/25 MPa) •The layer thickness and weight gain vs. exposure time followed parabolic law. •Oxide layers including Fe{sub 3}O{sub 4} (outer), Fe-Cr spinel (inner) and Cr{sub 2}O{sub 3} (transition) •Ni element is segregated by the selective oxidation of Cr.

• OSTI ID: 22689639
• Journal Information: Materials Characterization, Vol. 120; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMATES
CHROMIUM OXIDES
CORROSION
ENRICHMENT
FERRITES
FOURIER TRANSFORM SPECTROMETERS
GAIN
IRON OXIDES
LAYERS
MICROSTRUCTURE
NICKEL
OXIDATION
SPINELS
STAINLESS STEEL-310
TEMPERATURE RANGE 0400-1000 K
THICKNESS
TRANSMISSION ELECTRON MICROSCOPY
WATER
WEIGHT
X-RAY DIFFRACTION