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Ultra-high temperature creep rupture and transient burst strength of ODS steel claddings

Yano, Yasuhide ; Sekio, Yoshihiro ; Tanno, Takashi ; Kato, Shoichi ; Inoue, Toshihiko ; Oka, Hiroshi  ; Otsuka, Satoshi ; Furukawa, Tomohiro ; Uwaba, Tomoyuki ; Kaito, Takeji ; Ukai, Shigeharu*

9Cr-ODS steel claddings consisting of tempered martensitic matrix, showed prominent creep rupture strength at 1000 $$^{circ}$$C, which surpassed that of heat-resistant austenitic steels although creep rupture strength of tempered martensitic steels is generally lower than that of austenitic steels at high temperatures. The measured creep rupture strength of 9Cr-ODS steel claddings at 1000 $$^{circ}$$C was higher than that from extrapolated creep rupture trend curves formulated using data at temperatures from 650 to 850 $$^{circ}$$C. This superior strength seemed to be owing to transformation of the matrix from the $$alpha$$-phase to the $$gamma$$-phase. The transient burst strengths for 9Cr-ODS steel were much higher than those for 11Cr-ferritic/martensitic steel (PNC-FMS). Cumulative damage fraction analyses suggested that the life fraction rule can be used for the rupture life prediction of 9Cr-ODS steel and PNC-FMS claddings in the transient and accidental events with a certain accuracy.

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Category:Materials Science, Multidisciplinary

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