Thermal aging of Gr. 91 steel in supercritical thermal plant and its effect on structural integrity at elevated temperature
In this study, the influence of thermal aging on structural integrity is investigated for Gr. 91 steel. A commercial grade Gr. 91 steel is used for the virgin material, and service-exposed Gr. 91 steel is sampled from a steam pipe of a super critical plant. Time versus creep strain curves are obtain...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Nuclear Engineering and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573323003261 |
| _version_ | 1797355310071939072 |
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| author | Min-Gu Won Si-Hwa Jeong Nam-Su Huh Woo-Gon Kim Hyeong-Yeon Lee |
| author_facet | Min-Gu Won Si-Hwa Jeong Nam-Su Huh Woo-Gon Kim Hyeong-Yeon Lee |
| author_sort | Min-Gu Won |
| collection | DOAJ |
| description | In this study, the influence of thermal aging on structural integrity is investigated for Gr. 91 steel. A commercial grade Gr. 91 steel is used for the virgin material, and service-exposed Gr. 91 steel is sampled from a steam pipe of a super critical plant. Time versus creep strain curves are obtained through creep tests with various stress levels at 600 °C for the virgin and service-exposed Gr. 91 steels, respectively. Based on the creep test results, the improved Omega model is characterized for describing the total creep strain curve for both Gr. 91 steels. The proposed parameters for creep deformation model are used for predicting the steady-state creep strain rate, creep rupture curve, and stress relaxation. Creep-fatigue damage is evaluated for the intermediate heat exchanger (IHX) in a large-scale sodium test facility of STELLA-2 by using creep deformation model with proposed creep parameters and creep rupture curve for both Gr. 91 steels. Based on the comparison results of creep fatigue damage for the virgin and service-exposed Gr. 91 steels, the thermal aging effect has been shown to be significant. |
| first_indexed | 2024-03-08T14:09:18Z |
| format | Article |
| id | doaj.art-b35e920a39514aa6823892f612f95043 |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-03-08T14:09:18Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-b35e920a39514aa6823892f612f950432024-01-15T04:20:40ZengElsevierNuclear Engineering and Technology1738-57332024-01-0156118Thermal aging of Gr. 91 steel in supercritical thermal plant and its effect on structural integrity at elevated temperatureMin-Gu Won0Si-Hwa Jeong1Nam-Su Huh2Woo-Gon Kim3Hyeong-Yeon Lee4Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 beon-gil, Yuseong-gu, Daejeon, 34057, Republic of KoreaKorea Atomic Energy Research Institute, 111 Daedeok-daero 989 beon-gil, Yuseong-gu, Daejeon, 34057, Republic of KoreaDepartment of Mechanical System Design Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Republic of Korea; Corresponding author.Korea Energy Technology Group, Techno 4-ro, Yuseong-gu, Daejeon, 34014, Republic of KoreaKorea Atomic Energy Research Institute, 111 Daedeok-daero 989 beon-gil, Yuseong-gu, Daejeon, 34057, Republic of KoreaIn this study, the influence of thermal aging on structural integrity is investigated for Gr. 91 steel. A commercial grade Gr. 91 steel is used for the virgin material, and service-exposed Gr. 91 steel is sampled from a steam pipe of a super critical plant. Time versus creep strain curves are obtained through creep tests with various stress levels at 600 °C for the virgin and service-exposed Gr. 91 steels, respectively. Based on the creep test results, the improved Omega model is characterized for describing the total creep strain curve for both Gr. 91 steels. The proposed parameters for creep deformation model are used for predicting the steady-state creep strain rate, creep rupture curve, and stress relaxation. Creep-fatigue damage is evaluated for the intermediate heat exchanger (IHX) in a large-scale sodium test facility of STELLA-2 by using creep deformation model with proposed creep parameters and creep rupture curve for both Gr. 91 steels. Based on the comparison results of creep fatigue damage for the virgin and service-exposed Gr. 91 steels, the thermal aging effect has been shown to be significant.http://www.sciencedirect.com/science/article/pii/S1738573323003261Creep deformationCreep-fatigue damageCreep rupture stressGr. 91 steelThermal aging |
| spellingShingle | Min-Gu Won Si-Hwa Jeong Nam-Su Huh Woo-Gon Kim Hyeong-Yeon Lee Thermal aging of Gr. 91 steel in supercritical thermal plant and its effect on structural integrity at elevated temperature Nuclear Engineering and Technology Creep deformation Creep-fatigue damage Creep rupture stress Gr. 91 steel Thermal aging |
| title | Thermal aging of Gr. 91 steel in supercritical thermal plant and its effect on structural integrity at elevated temperature |
| title_full | Thermal aging of Gr. 91 steel in supercritical thermal plant and its effect on structural integrity at elevated temperature |
| title_fullStr | Thermal aging of Gr. 91 steel in supercritical thermal plant and its effect on structural integrity at elevated temperature |
| title_full_unstemmed | Thermal aging of Gr. 91 steel in supercritical thermal plant and its effect on structural integrity at elevated temperature |
| title_short | Thermal aging of Gr. 91 steel in supercritical thermal plant and its effect on structural integrity at elevated temperature |
| title_sort | thermal aging of gr 91 steel in supercritical thermal plant and its effect on structural integrity at elevated temperature |
| topic | Creep deformation Creep-fatigue damage Creep rupture stress Gr. 91 steel Thermal aging |
| url | http://www.sciencedirect.com/science/article/pii/S1738573323003261 |
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