Modeling the creep damage effect on the creep crack growth behavior of rotor steel
To evaluate the fracture life of steam turbine HP-IP rotors more accurately, an understanding of the creep damage effect on creep cracking performance of service-exposed rotor steel, and a proper creep crack growth (CCG) model considering the creep damage effect, is essential. In the present work co...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2018-08-01
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| Series: | Open Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/phys-2018-0068 |
| _version_ | 1818578555802484736 |
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| author | Ye Ting Wang Zhengdong Xuan Fu-Zhen |
| author_facet | Ye Ting Wang Zhengdong Xuan Fu-Zhen |
| author_sort | Ye Ting |
| collection | DOAJ |
| description | To evaluate the fracture life of steam turbine HP-IP rotors more accurately, an understanding of the creep damage effect on creep cracking performance of service-exposed rotor steel, and a proper creep crack growth (CCG) model considering the creep damage effect, is essential. In the present work comparative CCG tests were carried out on virgin and rotor steel that had been in service for 16 years, to examine the differences in creep crack microstructure and CCG rate between these two specimen types. Test results showed that the CCG rate of service-exposed steel is accelerated by creep damage due to metallurgical deterioration. Based on the CCG model derived by Webster, an improved CCG model is proposed by replacing the constant exponent with a creep-damage-related variable. To validate the improved model, a comparison of da/dt vs. C* between experiment data and the CCG models was conducted. The predictive result of the improved model is in better agreement with the experiment results than the classical CCG and Webster models for the service-exposed rotor steel. With decrement of C* value within the improved CCG model, the remaining life of HP-IP rotors may be predicted more accurately. |
| first_indexed | 2024-12-16T06:47:41Z |
| format | Article |
| id | doaj.art-92bfa85ec20c488ab17164d4bc8dd607 |
| institution | Directory Open Access Journal |
| issn | 2391-5471 |
| language | English |
| last_indexed | 2024-12-16T06:47:41Z |
| publishDate | 2018-08-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Open Physics |
| spelling | doaj.art-92bfa85ec20c488ab17164d4bc8dd6072022-12-21T22:40:29ZengDe GruyterOpen Physics2391-54712018-08-0116151752410.1515/phys-2018-0068phys-2018-0068Modeling the creep damage effect on the creep crack growth behavior of rotor steelYe Ting0Wang Zhengdong1Xuan Fu-Zhen2Key Laboratory of Pressurized System and Safety, Ministry of Education, East China University of Science and Technology, Shanghai200237, ChinaKey Laboratory of Pressurized System and Safety, Ministry of Education, East China University of Science and Technology, Shanghai200237, ChinaKey Laboratory of Pressurized System and Safety, Ministry of Education, East China University of Science and Technology, Shanghai200237, ChinaTo evaluate the fracture life of steam turbine HP-IP rotors more accurately, an understanding of the creep damage effect on creep cracking performance of service-exposed rotor steel, and a proper creep crack growth (CCG) model considering the creep damage effect, is essential. In the present work comparative CCG tests were carried out on virgin and rotor steel that had been in service for 16 years, to examine the differences in creep crack microstructure and CCG rate between these two specimen types. Test results showed that the CCG rate of service-exposed steel is accelerated by creep damage due to metallurgical deterioration. Based on the CCG model derived by Webster, an improved CCG model is proposed by replacing the constant exponent with a creep-damage-related variable. To validate the improved model, a comparison of da/dt vs. C* between experiment data and the CCG models was conducted. The predictive result of the improved model is in better agreement with the experiment results than the classical CCG and Webster models for the service-exposed rotor steel. With decrement of C* value within the improved CCG model, the remaining life of HP-IP rotors may be predicted more accurately.https://doi.org/10.1515/phys-2018-0068creep crack growthcreep damagecr-mo-v steelhigh temperature fracture46.50.+a62.20.mt |
| spellingShingle | Ye Ting Wang Zhengdong Xuan Fu-Zhen Modeling the creep damage effect on the creep crack growth behavior of rotor steel Open Physics creep crack growth creep damage cr-mo-v steel high temperature fracture 46.50.+a 62.20.mt |
| title | Modeling the creep damage effect on the creep crack growth behavior of rotor steel |
| title_full | Modeling the creep damage effect on the creep crack growth behavior of rotor steel |
| title_fullStr | Modeling the creep damage effect on the creep crack growth behavior of rotor steel |
| title_full_unstemmed | Modeling the creep damage effect on the creep crack growth behavior of rotor steel |
| title_short | Modeling the creep damage effect on the creep crack growth behavior of rotor steel |
| title_sort | modeling the creep damage effect on the creep crack growth behavior of rotor steel |
| topic | creep crack growth creep damage cr-mo-v steel high temperature fracture 46.50.+a 62.20.mt |
| url | https://doi.org/10.1515/phys-2018-0068 |
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