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Microstructural Evolution for Super304H Austenite Steel used in China Plants

    Chang Che Shaohai Ma Qingchuan Pan Kai Yan Gong Qian

Advanced Materials Letters, 2022, Volume 13, Issue Issue 2, Pages 2202-1694
10.5185/amlett.2022.021694

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Abstract

Super304H (18Cr-9Ni-3Cu-Nb-N) austenite steel has high creep strength and has been used as the material of tubes in 600℃ class supercritical power plants in China. Many Super304H materials have run for more than 100,000 hours. Long-time service feature of these austenitic stainless steels has not been understood. An understanding of the long-term microstructural evolution under actually used conditions is a key for the improvement of these heat resistant steels. In this article, creep behavior of Super304H used in China plants was analyzed, microstructural evolution of Super304H materials after different service conditions were studied involving in optical microscope, TEM and SAXS. The results show, M23C6, Cu-rich particles, and σ phase were found to precipitate. A quantitative assessment of microstructure evolution was given during long-term creep.
Keywords:
    Microstructural evolution austenite steel supercritical boiler
Main Subjects:
  • Composite Materials
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(2022). Microstructural Evolution for Super304H Austenite Steel used in China Plants. Advanced Materials Letters, 13(Issue 2), 2202-1694. doi: 10.5185/amlett.2022.021694
Chang Che; Shaohai Ma; Qingchuan Pan; Kai Yan; Gong Qian. "Microstructural Evolution for Super304H Austenite Steel used in China Plants". Advanced Materials Letters, 13, Issue 2, 2022, 2202-1694. doi: 10.5185/amlett.2022.021694
(2022). 'Microstructural Evolution for Super304H Austenite Steel used in China Plants', Advanced Materials Letters, 13(Issue 2), pp. 2202-1694. doi: 10.5185/amlett.2022.021694
Microstructural Evolution for Super304H Austenite Steel used in China Plants. Advanced Materials Letters, 2022; 13(Issue 2): 2202-1694. doi: 10.5185/amlett.2022.021694
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