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| CHARACTERIZATION OF THE POROSITY OF THE OXIDE SCALES ON FERRITIC-MARTENSITIC STEEL P91 AND P92 EXPOSED IN SUPERCRITICAL WATER |
| YIN Kaiju1; QIU Shaoyu1; TANG Rui1; ZHANG Qiang1;ZHANG Lefu2; LIU Hong1 |
1. National Key Lab.For Nuclear Fuel and Materials; Nuclear Power Institute of China; Chengdu 610041
2. School of Nuclear Science and Engineering; Shanghai Jiaotong University; Shanghai 200240 |
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Abstract The porosity of P91 and P92 exposed to 500, 550℃/25 MPa supercritical water (SCW) environment have been investigated. The oxidized samples were characterized by scanning electron microscopy (SEM)/energy dispersion X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The oxide scale is composed of a dual-layer structure: the outer magnetite (Fe3O4) and the inner magnetite-chromite (Fe3O4-FeCr2O4). An innermost internal oxidation zone was also observed in P92. The formation of pores is related to the defect types present in the magnetite structure, there are two major defect types in magnetite, one is interstitial Fe2+, and another is vacancy which may collapse into pores when vacancy concentration is high enough in supercritical water.
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Received: 25 February 2009
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Corresponding Authors:
TANG Rui
E-mail: xajttr@163.com
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Cite this article:
YIN Kaiju; QIU Shaoyu; TANG Rui; ZHANG Qiang;ZHANG Lefu; LIU Hong. CHARACTERIZATION OF THE POROSITY OF THE OXIDE SCALES ON FERRITIC-MARTENSITIC STEEL P91 AND P92 EXPOSED IN SUPERCRITICAL WATER. J Chin Soc Corr Pro, 2010, 30(1): 1-5.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I1/1
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