Ultra-high temperature creep rupture and transient burst strength of ODS steel claddings
Abstract
9Cr-ODS steel claddings consisting of tempered martensitic matrix, showed prominent creep rupture strength at 1000 °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 °C was higher than that from extrapolated creep rupture trend curves formulated using data at temperatures from 650 to 850 °C. This superior strength seemed to be owing to transformation of the matrix from the α-phase to the γ-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.
- Publication:
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Journal of Nuclear Materials
- Pub Date:
- April 2019
- DOI:
- 10.1016/j.jnucmat.2019.01.052
- Bibcode:
- 2019JNuM..516..347Y
- Keywords:
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- 9Cr-ODS steel cladding;
- Creep rupture strength;
- Transient burst properties;
- Cumulative damage fraction