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Characterization of creep-fatigue in ferritic 9Cr-1Mo-V-Nb steel using ultrasonic velocity

Authors
Kim, Chung SeokKwun, S. I.Park, Ik Keun
Issue Date
15-Jul-2008
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF NUCLEAR MATERIALS, v.377, no.3, pp.496 - 500
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF NUCLEAR MATERIALS
Volume
377
Number
3
Start Page
496
End Page
500
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/123024
DOI
10.1016/j.jnucmat.2008.04.012
ISSN
0022-3115
Abstract
The microstructural evolution of ferritic 9Cr-1 Mo-V-Nb steel, subjected to creep-fatigue at 550 OC, was evaluated nondestructively by measuring the ultrasonic velocity. The ultrasonic velocity was strongly depended on the microstructural changes during creep-fatigue. The variation in the ultrasonic velocity with the fatigue life fraction exhibited three regions. In the first region (within 0.2 Nr), a significant increase in the velocity was observed, followed by a slight increase between the fatigue life fractions of 0.2 Nf and 0.8 Nf and a decrease in the final region. The change of the ultrasonic velocity during creep-fatigue was interpreted in relation to the microstructural properties. This study proposes an ultrasonic nondestructive evaluation method of quantifying the level of damage and microstructural change during the creep-fatigue of ferritic 9Cr-lMo-V-Nb steel. (c) 2008 Elsevier B.V. All rights reserved.
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