Oxidation behavior of ferritic/martensitic steels in flowing supercritical water

Quanqiang Shi¹，Wei Yan¹，Yanfen Li¹，Naiqiang Zhang²，Yiyin Shan¹，Ke Yang³，Hiroaki Abe⁴

1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences2. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University3. Institute of Metal Research, Chinese Academy of Sciences4. School of Engineering, The University of Tokyo

摘 要：The oxidation behavior of two Ferritic/Martensitic（F/M） steels including novel SIMP steel and commercial P91 steel were investigated by exposure to flowing deaerated supercritical water（SCW） at 700℃ for up to 1000 h. The kinetic weight gain curves follow parabolic and near-cubic rate equations for SIMP and P91 steels, respectively. X-Ray Diffraction analysis showed the presence of magnetite and a spinel phase in flowing SCW for both steels. The morphology and structure of the oxide scales formed on these two steels were analyzed. The relationship between the microstructure and oxidation behavior and the reason that SIMP steel showed better oxidation resistance than P91 steel were discussed.

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