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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| Дата: | 2017 |
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| Автор: | |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Інститут проблем міцності ім. Г.С. Писаренко НАН України
2017
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| Назва видання: | Проблемы прочности |
| Теми: | |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/173577 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-1735772020-12-13T01:25:50Z Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions Kim, C.S. Научно-технический раздел 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. 2017 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/173577 539.4 en Проблемы прочности Інститут проблем міцності ім. Г.С. Писаренко НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Научно-технический раздел Научно-технический раздел |
| spellingShingle |
Научно-технический раздел Научно-технический раздел Kim, C.S. Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions Проблемы прочности |
| 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. |
| format |
Article |
| author |
Kim, C.S. |
| author_facet |
Kim, C.S. |
| author_sort |
Kim, C.S. |
| title |
Study of Mechanical Degradation of 9Cr-1Mo-V-Nb Steel under Creep-Fatigue Interaction Conditions |
| 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 |
| publisher |
Інститут проблем міцності ім. Г.С. Писаренко НАН України |
| publishDate |
2017 |
| topic_facet |
Научно-технический раздел |
| url |
http://dspace.nbuv.gov.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. |
| series |
Проблемы прочности |
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AT kimcs studyofmechanicaldegradationof9cr1movnbsteelundercreepfatigueinteractionconditions |
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2023-10-18T22:34:25Z |
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2023-10-18T22:34:25Z |
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1796155871069208576 |