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Open AccessArticle

The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel

1
Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 22, 616 62 Brno, Czech Republic
2
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
3
UJP PRAHA a.s., Nad Kamínkou 1345, 156 10 Praha-Zbraslav, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2018, 11(5), 787; https://doi.org/10.3390/ma11050787
Received: 16 April 2018 / Revised: 4 May 2018 / Accepted: 8 May 2018 / Published: 12 May 2018
(This article belongs to the Special Issue Dynamic Recrystallization and Microstructural Evolution in Alloys)
The 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
Keywords: creep-resistant 9%Cr steels; ultrafine grained materials; creep; electron back scatter diffraction creep-resistant 9%Cr steels; ultrafine grained materials; creep; electron back scatter diffraction
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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.

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