Characterization of creep-fatigue in ferritic 9Cr-1Mo-V-Nb steel using ultrasonic velocity |
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| Authors: | Chung Seok Kim Ik Keun Park |
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| Affiliation: | a Division of Materials Science and Engineering, Korea University, Seoul 136-701, Republic of Korea
b Department of Mechanical Engineering, Seoul National University of Technology, 172, Gongreung 2-dong, Nowon-gu, Seoul 139-743, Republic of Korea |
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| Abstract: | The microstructural evolution of ferritic 9Cr-1Mo-V-Nb steel, subjected to creep-fatigue at 550 °C, 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 Nf), 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-1Mo-V-Nb steel. |
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| Keywords: | 81.70.Cv 43.25.Ba 62.20.M |
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