Anisotropy in the Creep–Fatigue Behaviors of a Directionally Solidified Ni-Based Superalloy: Damage Mechanisms and Life Assessment
Aero-engine turbine vanes made from directionally solidified nickel-based superalloys often fail with crack formation from the external wall of cooling channels. Therefore, this study simulates the compressive load on the external wall of the vane and conducts a sequence of creep–fatigue evaluations...
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MDPI AG
2025-04-01
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| Online Access: | https://www.mdpi.com/2073-4352/15/5/429 |
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| author | Anping Long Xiaoshan Liu Lei Xiao Gaoxiang Zhang Jiangying Xiong Ganjiang Feng Jianzheng Guo Rutie Liu |
| author_facet | Anping Long Xiaoshan Liu Lei Xiao Gaoxiang Zhang Jiangying Xiong Ganjiang Feng Jianzheng Guo Rutie Liu |
| author_sort | Anping Long |
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| description | Aero-engine turbine vanes made from directionally solidified nickel-based superalloys often fail with crack formation from the external wall of cooling channels. Therefore, this study simulates the compressive load on the external wall of the vane and conducts a sequence of creep–fatigue evaluations at 980 °C to investigate the creep–fatigue damage mechanisms of a directionally solidified superalloy and to assess its life. It is found that at low strain ranges, creep damage is dominant, with creep cavities forming inside the specimen and fatigue sources mostly distributed in the specimen interior. As the strain range increases, the damage mechanism transitions from creep-dominated to creep–fatigue coupled damage, with cracks nucleating preferentially on the surface and exhibiting a characteristic of multiple fatigue sources. In the longitudinal (L) specimen, dislocations in multiple orientations of the {111}<110> slip system are activated simultaneously, interacting within the γ channels to form dislocation networks, and dislocations shear through the γ′ phase via antiphase boundary (APB) pairs. In the transverse (T) specimen, stacking intrinsic stacking faults (SISFs) accumulate within the limited {111}<112> slip systems, subsequently forming a dislocation slip band. The modified creep–fatigue life prediction model, incorporating strain energy dissipation and stress relaxation mechanisms, demonstrates an accurate fatigue life prediction under creep–fatigue coupling, with a prediction accuracy within an error band of 1.86 times. |
| format | Article |
| id | doaj-art-84e3fdc55357417f9688d36fdc6a44ca |
| institution | OA Journals |
| issn | 2073-4352 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Crystals |
| spelling | doaj-art-84e3fdc55357417f9688d36fdc6a44ca2025-08-20T02:33:38ZengMDPI AGCrystals2073-43522025-04-0115542910.3390/cryst15050429Anisotropy in the Creep–Fatigue Behaviors of a Directionally Solidified Ni-Based Superalloy: Damage Mechanisms and Life AssessmentAnping Long0Xiaoshan Liu1Lei Xiao2Gaoxiang Zhang3Jiangying Xiong4Ganjiang Feng5Jianzheng Guo6Rutie Liu7State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaWedge Central South Research Institute Co., Ltd., Shenzhen 518045, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaAero-engine turbine vanes made from directionally solidified nickel-based superalloys often fail with crack formation from the external wall of cooling channels. Therefore, this study simulates the compressive load on the external wall of the vane and conducts a sequence of creep–fatigue evaluations at 980 °C to investigate the creep–fatigue damage mechanisms of a directionally solidified superalloy and to assess its life. It is found that at low strain ranges, creep damage is dominant, with creep cavities forming inside the specimen and fatigue sources mostly distributed in the specimen interior. As the strain range increases, the damage mechanism transitions from creep-dominated to creep–fatigue coupled damage, with cracks nucleating preferentially on the surface and exhibiting a characteristic of multiple fatigue sources. In the longitudinal (L) specimen, dislocations in multiple orientations of the {111}<110> slip system are activated simultaneously, interacting within the γ channels to form dislocation networks, and dislocations shear through the γ′ phase via antiphase boundary (APB) pairs. In the transverse (T) specimen, stacking intrinsic stacking faults (SISFs) accumulate within the limited {111}<112> slip systems, subsequently forming a dislocation slip band. The modified creep–fatigue life prediction model, incorporating strain energy dissipation and stress relaxation mechanisms, demonstrates an accurate fatigue life prediction under creep–fatigue coupling, with a prediction accuracy within an error band of 1.86 times.https://www.mdpi.com/2073-4352/15/5/429anisotropycreep–fatiguedirectionally solidified Ni-based superalloydamage mechanismlife assessment |
| spellingShingle | Anping Long Xiaoshan Liu Lei Xiao Gaoxiang Zhang Jiangying Xiong Ganjiang Feng Jianzheng Guo Rutie Liu Anisotropy in the Creep–Fatigue Behaviors of a Directionally Solidified Ni-Based Superalloy: Damage Mechanisms and Life Assessment Crystals anisotropy creep–fatigue directionally solidified Ni-based superalloy damage mechanism life assessment |
| title | Anisotropy in the Creep–Fatigue Behaviors of a Directionally Solidified Ni-Based Superalloy: Damage Mechanisms and Life Assessment |
| title_full | Anisotropy in the Creep–Fatigue Behaviors of a Directionally Solidified Ni-Based Superalloy: Damage Mechanisms and Life Assessment |
| title_fullStr | Anisotropy in the Creep–Fatigue Behaviors of a Directionally Solidified Ni-Based Superalloy: Damage Mechanisms and Life Assessment |
| title_full_unstemmed | Anisotropy in the Creep–Fatigue Behaviors of a Directionally Solidified Ni-Based Superalloy: Damage Mechanisms and Life Assessment |
| title_short | Anisotropy in the Creep–Fatigue Behaviors of a Directionally Solidified Ni-Based Superalloy: Damage Mechanisms and Life Assessment |
| title_sort | anisotropy in the creep fatigue behaviors of a directionally solidified ni based superalloy damage mechanisms and life assessment |
| topic | anisotropy creep–fatigue directionally solidified Ni-based superalloy damage mechanism life assessment |
| url | https://www.mdpi.com/2073-4352/15/5/429 |
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