Applicability of nonlinear ultrasonic technique to evaluation of thermally aged CF8M cast stainless steel
Cast austenitic stainless steel (CASS) is used for fabricating different components of the primary reactor coolant system of pressurized water reactors. However, the thermal embrittlement of CASS resulting from long-term operation causes structural safety problems. Ultrasonic testing for flaw detect...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-03-01
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| Series: | Nuclear Engineering and Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573319305777 |
| _version_ | 1818441432917082112 |
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| author | Jongbeom Kim Jin-Gyum Kim Byeongseo Kong Kyung-Mo Kim Changheui Jang Sung-Sik Kang Kyung-Young Jhang |
| author_facet | Jongbeom Kim Jin-Gyum Kim Byeongseo Kong Kyung-Mo Kim Changheui Jang Sung-Sik Kang Kyung-Young Jhang |
| author_sort | Jongbeom Kim |
| collection | DOAJ |
| description | Cast austenitic stainless steel (CASS) is used for fabricating different components of the primary reactor coolant system of pressurized water reactors. However, the thermal embrittlement of CASS resulting from long-term operation causes structural safety problems. Ultrasonic testing for flaw detection has been used to assess the thermal embrittlement of CASS; however, the high scattering and attenuation of the ultrasonic wave propagating through CASS make it difficult to accurately quantify the flaw size. In this paper, we present a different approach for evaluating the thermal embrittlement of CASS by assessing changes in the material properties of CASS using a nonlinear ultrasonic technique, which is a potential nondestructive method. For the evaluation, we prepared CF8M specimens that were thermally aged under four different heating conditions. Nonlinear ultrasonic measurements were performed using a contact piezoelectric method to obtain the relative ultrasonic nonlinearity parameter, and a mini-sized tensile test was performed to investigate the correlation of the parameter with material properties. Experimental results showed that the ultrasonic nonlinearity parameter had a correlation with tensile properties such as the tensile strength and elongation. Consequently, we could confirm the applicability of the nonlinear ultrasonic technique to the evaluation of the thermal embrittlement of CASS. Keywords: Cast austenitic stainless steel, CF8M, Nonlinear ultrasonic technique, Tensile test |
| first_indexed | 2024-12-14T18:28:10Z |
| format | Article |
| id | doaj.art-5804cba3a8e04e10ae724383f98db112 |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-14T18:28:10Z |
| publishDate | 2020-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-5804cba3a8e04e10ae724383f98db1122022-12-21T22:51:53ZengElsevierNuclear Engineering and Technology1738-57332020-03-01523621625Applicability of nonlinear ultrasonic technique to evaluation of thermally aged CF8M cast stainless steelJongbeom Kim0Jin-Gyum Kim1Byeongseo Kong2Kyung-Mo Kim3Changheui Jang4Sung-Sik Kang5Kyung-Young Jhang6Korea Atomic Energy Research Institute, Daejeon, 34057, Republic of KoreaKorea Institute of Nuclear Safety, Daejeon, 34142, Republic of KoreaDepartment of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of KoreaKorea Atomic Energy Research Institute, Daejeon, 34057, Republic of KoreaDepartment of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of KoreaKorea Institute of Nuclear Safety, Daejeon, 34142, Republic of Korea; Corresponding author.,School of Mechanical Engineering, Hanyang University, Seoul, 04736, Republic of Korea; Corresponding author.Cast austenitic stainless steel (CASS) is used for fabricating different components of the primary reactor coolant system of pressurized water reactors. However, the thermal embrittlement of CASS resulting from long-term operation causes structural safety problems. Ultrasonic testing for flaw detection has been used to assess the thermal embrittlement of CASS; however, the high scattering and attenuation of the ultrasonic wave propagating through CASS make it difficult to accurately quantify the flaw size. In this paper, we present a different approach for evaluating the thermal embrittlement of CASS by assessing changes in the material properties of CASS using a nonlinear ultrasonic technique, which is a potential nondestructive method. For the evaluation, we prepared CF8M specimens that were thermally aged under four different heating conditions. Nonlinear ultrasonic measurements were performed using a contact piezoelectric method to obtain the relative ultrasonic nonlinearity parameter, and a mini-sized tensile test was performed to investigate the correlation of the parameter with material properties. Experimental results showed that the ultrasonic nonlinearity parameter had a correlation with tensile properties such as the tensile strength and elongation. Consequently, we could confirm the applicability of the nonlinear ultrasonic technique to the evaluation of the thermal embrittlement of CASS. Keywords: Cast austenitic stainless steel, CF8M, Nonlinear ultrasonic technique, Tensile testhttp://www.sciencedirect.com/science/article/pii/S1738573319305777 |
| spellingShingle | Jongbeom Kim Jin-Gyum Kim Byeongseo Kong Kyung-Mo Kim Changheui Jang Sung-Sik Kang Kyung-Young Jhang Applicability of nonlinear ultrasonic technique to evaluation of thermally aged CF8M cast stainless steel Nuclear Engineering and Technology |
| title | Applicability of nonlinear ultrasonic technique to evaluation of thermally aged CF8M cast stainless steel |
| title_full | Applicability of nonlinear ultrasonic technique to evaluation of thermally aged CF8M cast stainless steel |
| title_fullStr | Applicability of nonlinear ultrasonic technique to evaluation of thermally aged CF8M cast stainless steel |
| title_full_unstemmed | Applicability of nonlinear ultrasonic technique to evaluation of thermally aged CF8M cast stainless steel |
| title_short | Applicability of nonlinear ultrasonic technique to evaluation of thermally aged CF8M cast stainless steel |
| title_sort | applicability of nonlinear ultrasonic technique to evaluation of thermally aged cf8m cast stainless steel |
| url | http://www.sciencedirect.com/science/article/pii/S1738573319305777 |
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