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

Author:
Akhiani, Hamed  Nezakat, Majid  Penttila, Sami  Szpunar, Jerzy  


Journal:
JOURNAL OF NUCLEAR ENGINEERING AND RADIATION SCIENCE


Issue Date:
2016


Abstract(summary):

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 degrees 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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