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Materials at High Temperatures Volume 35, 2018 - Issue 5
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Research Article

Oxidation and chromia evaporation of austenitic steel TP347HFG in supercritical water

Naiqiang ZhangKey Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing, PR China
,
Qi CaoKey Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing, PR China
,
Jiajia GuiKey Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing, PR China
,
Mengyuan LiState Grid Energy Conservation Service Co. Ltd, Beijing, PR China
,
Yongzhong NiKey Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing, PR China
&
Hong XuKey Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing, PR ChinaCorrespondence[email protected]
Pages 461-468 | Received 27 Mar 2017, Accepted 14 Sep 2017, Published online: 28 Sep 2017
 
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ABSTRACT

The evaporation of protective chromia scales is expected to be a primary oxidation mechanism. An oxidation test of austenitic steel TP347HFG in supercritical water was carried out at 550 and 600°C under 25 MPa with a dissolved oxygen content of 2000 ppb. The results show that the protective chromia scale forms at the earlier stage and then disappears gradually with the increasing exposure time due to chromium evaporation in the presence of both dissolved oxygen and supercritical water. The effect of chromia evaporation on oxidation resistance of austenitic steels in supercritical water is discussed.

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