Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 547, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2021.152833
Keywords
ODS; Creep test; Very long-term; TEM; XRD
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The microstructure of 9Cr oxide dispersion strengthened tempered martensitic steel (TMS) cladding and 12Cr-ODS ferritic steel cladding after very long-term internal pressurized creep tests was observed. The stability of martensite and ferrite matrix structure, including carbide distribution and nano-particle distribution, were investigated. Results confirmed that nano-particles were stably present during high-temperature and very long-term stress loading, contributing to preventing matrix structure degradation and excellent creep strength of the materials.
Microstructure of 9Cr oxide dispersion strengthened (ODS) tempered martensitic steel (TMS) cladding and 12Cr-ODS ferritic steel cladding after very long-term internal pressurized creep tests was observed. The creep test conditions were 700 degrees C for 46,504 h and 750 degrees C for 45,550 h for 9Cr-ODS TMS and 700 degrees C for 30,116 h for 12Cr-ODS ferritic steel. The stability of martensite and ferrite matrix structure, including carbide distribution, dislocation density, and lath boundary, and that of nano-particle distribution were investigated. It was confirmed that the nano-particles were stably present during the high-temperature and very long-term stress loading environment, contributing to the prevention of matrix structure degradation. The results of observation are consistent with the fact that the 9Cr-ODS TMS and 12Cr-ODS ferritic steel exhibit excellent creep strength and show no reduction in the slope of the stress versus time to rupture curve over a significantly extended period of time in the creep test. (C) 2021 Elsevier B.V. All rights reserved.
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