The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel
AbstractThe effect of ultrafine-grained size on creep behaviour was investigated in P92 steel. Ultrafine-grained steel was prepared by one revolution of high-pressure torsion at room temperature. Creep tensile tests were performed at 873 K under the initially-applied stress range between 50 and 160 MPa. The microstructure was investigated using transmission electron microscopy and scanning electron microscopy equipped with an electron-back scatter detector. It was found that ultrafine-grained steel exhibits significantly faster minimum creep rates, and there was a decrease in the value of the stress exponent in comparison with coarse-grained P92 steel. Creep results also showed an abrupt decrease in the creep rate over time during the primary stage. The abrupt deceleration of the creep rate during the primary stage was shifted, with decreasing applied stress with longer creep times. The change in the decline of the creep rate during the primary stage was probably related to the enhanced precipitation of the Laves phase in the ultrafine-grained microstructure. View Full-Text
- Supplementary File 1:
ZIP-Document (ZIP, 5458 KB)
Share & Cite This Article
Kral, P.; Dvorak, J.; Sklenicka, V.; Masuda, T.; Horita, Z.; Kucharova, K.; Kvapilova, M.; Svobodova, M. The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel. Materials 2018, 11, 787.
Kral P, Dvorak J, Sklenicka V, Masuda T, Horita Z, Kucharova K, Kvapilova M, Svobodova M. The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel. Materials. 2018; 11(5):787.Chicago/Turabian Style
Kral, Petr; Dvorak, Jiri; Sklenicka, Vaclav; Masuda, Takahiro; Horita, Zenji; Kucharova, Kveta; Kvapilova, Marie; Svobodova, Marie. 2018. "The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel." Materials 11, no. 5: 787.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.