Abstract
In the pressure vessel of a very-high-temperature reactor (VHTR), creep damage, which has a fatal adverse effect on safe operation, occurs due to long-term operation at a higher temperature. In this paper, only the small punch creep test (SPCT) was used to evaluate the creep properties of modified 9Cr-1Mo steel, which is considered a suitable candidate material for VHTR pressure vessels. Since the test outputs of SPCT are displacement and load, we converted those outputs into the strain and stress of conventional uniaxial creep tests (UCTs). The Norton, Larson-Miller and Monkman-Grant creep models were constructed using the conversion data from SPCT and the triangular relationship among the three creep models was successfully demonstrated. Finally, those three models were constructed using long-term UCT with the same material and temperature, and the validity of this study was verified by comparing it with SPCT results.
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This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2021R1A6A1A 03039696).
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Sangyeop Kim is a Graduate Student of the School of Mechanical Engineering, Sungkyunkwan University, Korea. He received his B.S. degree in School of Mechanical Engineering from Sungkyunkwan University, Korea, in 2019. His research interests include material property evaluation and computer aided engineering.
Uijeong Ro is a Graduate Student of the School of Mechanical Engineering, Sungkyunkwan University, Korea. He received his B.S. degree in School of Mechanical Engineering from Sungkyunkwan University, Korea, in 2018. His research interests include material property evaluation and computer aided engineering.
Yong Hwi Kim is a Graduate Student of the School of Mechanical Engineering, Sungkyunkwan University, Korea. He received his B.S. degree in School of Civil Engineering from Ajou University, Korea, in 2017 and M.S. degree in School of Mechanical Engineering from Sungkyunkwan University, Korea, in 2020. His research interests include structure analysis and metal AM.
Taeksang Lee is an Assistant Professor of the Department of Mechanical Engineering, Myongji University, Korea. He received his B.S. and M.S. degrees in School of Mechanical Engineering from Sungkyunkwan University, Korea, in 2014 and 2016, respectively, and Ph.D. degree from Purdue University in 2020. His research interests include computational biomechanics based on data-driven modeling, finite element method, and Bayesian inference.
Moon Ki Kim is a Professor of the School of Mechanical Engineering, Sungkyunkwan University, Korea. He received his B.S. and M.S. degrees in School of Mechanical Engineering from Seoul National University in 1997 and 1999, respectively, and Ph.D. degree from Johns Hopkins University in 2004. He had been an Assistant Professor in the Department of Mechanical and Industrial Engineering at University of Massachusetts, Amherst from 2004 to 2008. His research interests include computational structural biology based on robot kinematics, bioinstrumentations and multiscale modeling and simulation.
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Kim, S., Ro, U., Kim, Y.H. et al. Evaluation of creep properties using small punch creep test for modified 9Cr-1Mo steel. J Mech Sci Technol 36, 4549–4561 (2022). https://doi.org/10.1007/s12206-022-0818-y
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DOI: https://doi.org/10.1007/s12206-022-0818-y