Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions
Creep-fatigue tests of 9Cr-1Mo-V-Nb steel have been conducted under load control with further study of the steel mechanical degradation via microscopic observation, static-mechanical analysis and ultrasonic evaluation. The tempered specimens exhibited a tempered martensitic structure with a high dis...
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| Published in: | Проблемы прочности |
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| Date: | 2017 |
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| Format: | Article |
| Language: | English |
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Інститут проблем міцності ім. Г.С. Писаренко НАН України
2017
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/173577 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions / C.S. Kim // Проблемы прочности. — 2017. — № 1. — С. 7-14. — Бібліогр.: 15 назв. — англ. |
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Kim, C.S. 2020-12-12T13:26:07Z 2020-12-12T13:26:07Z 2017 Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions / C.S. Kim // Проблемы прочности. — 2017. — № 1. — С. 7-14. — Бібліогр.: 15 назв. — англ. 0556-171X https://nasplib.isofts.kiev.ua/handle/123456789/173577 539.4 Creep-fatigue tests of 9Cr-1Mo-V-Nb steel have been conducted under load control with further study of the steel mechanical degradation via microscopic observation, static-mechanical analysis and ultrasonic evaluation. The tempered specimens exhibited a tempered martensitic structure with a high dislocation density in the lath interior and fine precipitates on the previous austenite grain and martensite lath boundaries. However, the major microstructure changes to the 9Cr-1Mo-V-Nb steel caused by creep-fatigue were the coarsening of Cr23C6 precipitates, the recovery of dislocations due to rearrangement and annihilation, an increase in the martensite lath width, and the formation of cavities. The ultrasonic velocity was observed to increase rapidly within the initial fatigue life fraction (stage I), but the attenuation decreased during this stage. During stage II, there was a slight increase in the ultrasonic velocity and the attenuation subsequently decreased. The ultrasonic velocity decreased and the attenuation increased during the final period (stage III) of fatigue life. This research was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korean Government (NRF-2013M2A2A9043241). en Інститут проблем міцності ім. Г.С. Писаренко НАН України Проблемы прочности Научно-технический раздел Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions Определение степени ухудшения механических характеристик стали 9Cr-lMo-V-Nb в условиях взаимодействия ползучести и усталости Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
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| title |
Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions |
| spellingShingle |
Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions Kim, C.S. Научно-технический раздел |
| title_short |
Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions |
| title_full |
Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions |
| title_fullStr |
Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions |
| title_full_unstemmed |
Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions |
| title_sort |
study of mechanical degradation of 9cr-1mo-v-nb steel under creep-fatigue interaction conditions |
| author |
Kim, C.S. |
| author_facet |
Kim, C.S. |
| topic |
Научно-технический раздел |
| topic_facet |
Научно-технический раздел |
| publishDate |
2017 |
| language |
English |
| container_title |
Проблемы прочности |
| publisher |
Інститут проблем міцності ім. Г.С. Писаренко НАН України |
| format |
Article |
| title_alt |
Определение степени ухудшения механических характеристик стали 9Cr-lMo-V-Nb в условиях взаимодействия ползучести и усталости |
| description |
Creep-fatigue tests of 9Cr-1Mo-V-Nb steel have been conducted under load control with further study of the steel mechanical degradation via microscopic observation, static-mechanical analysis and ultrasonic evaluation. The tempered specimens exhibited a tempered martensitic structure with a high dislocation density in the lath interior and fine precipitates on the previous austenite grain and martensite lath boundaries. However, the major microstructure changes to the 9Cr-1Mo-V-Nb steel caused by creep-fatigue were the coarsening of Cr23C6 precipitates, the recovery of dislocations due to rearrangement and annihilation, an increase in the martensite lath width, and the formation of cavities. The ultrasonic velocity was observed to increase rapidly within the initial fatigue life fraction (stage I), but the attenuation decreased during this stage. During stage II, there was a slight increase in the ultrasonic velocity and the attenuation subsequently decreased. The ultrasonic velocity decreased and the attenuation increased during the final period (stage III) of fatigue life.
|
| issn |
0556-171X |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/173577 |
| citation_txt |
Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions / C.S. Kim // Проблемы прочности. — 2017. — № 1. — С. 7-14. — Бібліогр.: 15 назв. — англ. |
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| first_indexed |
2025-12-07T16:51:40Z |
| last_indexed |
2025-12-07T16:51:40Z |
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