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Stress state dependent creep damage behavior of 9–12% Cr steel notched components.
- Source :
-
Materials Science & Engineering: A . Feb2021, Vol. 804, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- Creep damage is governed by different microstructural features (e.g. precipitate coarsening, substructure growth, cavity/crack nucleation and growth) during long term high temperature exposure in 9–12%Cr steels. The dependences of stress states (e.g. equivalent stress and stress tri-axiality) on these damage mechanisms are clarified in this work. Various stress states are produced in FB2 steel notched components with different root radii for creep tests at 605 °C. Results indicate that equivalent stress and stress tri-axiality present different influences on creep damage behavior of notched components at elevated temperatures. The equivalent stress and stress tri-axiality both enhance the precipitation of the carbide, indicating larger mean diameter and higher area of the precipitates. Meanwhile, the equivalent stress plays a more significant role on the coarsening of the substructure of the material than the stress tri-axiality. Creep cavities are mainly found at several hundred micrometers away from the notch root, which seems to be induced by the combining action of equivalent stress and stress tri-axiality. These microstructural degradation can be proved by the distribution of the hardness in the notch region of component accompanied by the variation of stress states. • Dependences of stress states on microstructural evolution and creep damage behavior are clarified. • Equivalent stress and stress tri-axiality present different influences on creep damage behavior of notched components. • Equivalent stress and stress tri-axiality both enhance the precipitation of the carbide. • Equivalent stress plays a more significant role on the coarsening of the substructure than stress tri-axiality. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09215093
- Volume :
- 804
- Database :
- Academic Search Index
- Journal :
- Materials Science & Engineering: A
- Publication Type :
- Academic Journal
- Accession number :
- 148434379
- Full Text :
- https://doi.org/10.1016/j.msea.2021.140762