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Uijeong Ro,Jeong Hwan Kim,김상엽,Moon Ki Kim 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
Since conventional creep-fatigue testing methods have certain limitations in performing creep-dominant tests, an alternative testing method is suggested to observe creepdominant creep-fatigue interaction in modified 9Cr-1Mo steel at 823 K. Here, creep-fatigue interaction is divided into two steps: the creep damaging process and the fatigue damaging process. The advantage of this “interrupted” testing method is mainly in the creep-dominant region. Several creep-dominant testing results are newly obtained and compared with the conventional evaluation criteria in the ASME-BPVC and RCC-MRx codes. Consequently, the proposed method demonstrates the better capability to capture creep-fatigue interaction of materials at high temperature.
Evaluation of creep properties using small punch creep test for modified 9Cr-1Mo steel
김상엽,Uijeong Ro,Yong Hwi Kim,이택상,Moon Ki Kim 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9
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.