Research Papers

Microstructural Effects on the Oxidation Behavior of Alloy 800HT in Supercritical Water

[+] Author and Article Information
Hamed Akhiani

University of Saskatchewan,
57 Campus Drive, Saskatoon S7K5A9, Canada
e-mail: hamed.akhiani@usask.ca

Majid Nezakat

University of Saskatchewan,
57 Campus Drive, Saskatoon S7K5A9, Canada
e-mail: majid.nezakat@usask.ca

Sami Penttilä

VTT Technical Research Centre of Finland,
Kemistintie 3, P.O. Box 1000, Espoo, FI-02044 VTT, Finland
e-mail: sami.penttila@vtt.fi

Jerzy Szpunar

University of Saskatchewan,
57 Campus Drive, Saskatoon S7K5A9, Canada
e-mail: jerzy.szpunar@usask.ca

Manuscript received April 7, 2015; final manuscript received July 6, 2015; published online February 29, 2016. Assoc. Editor: Thomas Schulenberg.

ASME J of Nuclear Rad Sci 2(2), 021009 (Feb 29, 2016) (7 pages) Paper No: NERS-15-1046; doi: 10.1115/1.4031036 History: Received April 07, 2015; Accepted July 07, 2015

Alloy 800HT is one promising candidate for use as a fuel cladding material in supercritical water-cooled rectors. In the present study, specific thermomechanical processing (TMP) was used to study the effects of grain size and grain boundary character distribution (GBCD) on the oxidation behavior of alloy 800HT in supercritical water (SCW). The processed samples were exposed to SCW at 600°C and 25 MPa for 100, 300, and 1000 h. The results showed that grain size and grain boundaries are important factors that affect the oxidation behavior of alloy 800HT in SCW. We also found that TMP improves the adhesion and integrity of the oxide scale.

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Fig. 1

Weight change of the starting and processed alloy 800HT samples at 100, 300, and 1000 h of SCW exposure

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Fig. 2

Images of the starting coupon (as received, before exposure), starting and processed samples after 100, 300, and 1000 h of SCW exposure (black and color arrows are just used for better visual contrast)

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Fig. 3

SEM image with EDS maps showing different regions which formed upon oxidation of alloy 800HT in SCW: (a) titanium carbide precipitate, (b) enrich chromium oxide, (c) Fe, Cr, Ni spinel, and (d) Fe oxide island [22]

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Fig. 4

EBSD (a) band contrast, (b) phase map, (c) IPF Z, and EDS maps of iron oxide islands on the cross section [22]

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Fig. 5

Cross section of iron oxide islands [22]

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Fig. 6

Grain size of the processed samples as a function of rolling modes for various reductions

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Fig. 7

CSL fraction of the starting and processed (annealed) samples versus reduction percentage

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Fig. 8

CSL/GB maps of the 50UDR sample after (a) 100 and (b) 1000 h of SCW exposure. HAGB, black; AGB, gray; Σ3, violet; Σ9, blue; and Σ27: green (for interpretation of the references to color in this figure, the reader is referred to the web version of this article)

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Fig. 9

CSL fraction of the 50UDR sample after 0, 100, and 1000 h of SCW exposure

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Fig. 10

EBSD band contrast with CSL and phase maps of alloy 800HT: starting (as-received) and 50UDR samples after 1000 h SCW exposure. Σ3, red; Σ7, blue; Σ9, violet; Σ11, yellow; Σ27, green (for interpretation of the references to color in this figure, the reader is referred to the web version of this article)




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