Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96
FGH96 is a powder metallurgy Ni-based superalloy used for turbine disks of aero-engines. In the present study, room-temperature pre-tension experiments with various plastic strain were conducted for the P/M FGH96 alloy, and subsequent creep tests were conducted under the test conditions of 700 °C an...
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MDPI AG
2023-05-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/10/3874 |
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| author | Hao Wang Jingyu Zhang Huashan Shang Aixue Sha Yangyang Cheng Huiling Duan |
| author_facet | Hao Wang Jingyu Zhang Huashan Shang Aixue Sha Yangyang Cheng Huiling Duan |
| author_sort | Hao Wang |
| collection | DOAJ |
| description | FGH96 is a powder metallurgy Ni-based superalloy used for turbine disks of aero-engines. In the present study, room-temperature pre-tension experiments with various plastic strain were conducted for the P/M FGH96 alloy, and subsequent creep tests were conducted under the test conditions of 700 °C and 690 MPa. The microstructures of the pre-strained specimens after room-temperature pre-strain and after 70 h creep were investigated. A steady-state creep rate model was proposed, considering the micro-twinning mechanism and pre-strain effects. Progressive increases in steady-state creep rate and creep stain within 70 h were found with increasing amounts of pre-strain. Room-temperature pre-tension within 6.04% plastic strain had no obvious influence on the morphology and distribution of γ′ precipitates, although the dislocation density continuously increased with the increase in pre-strains. The increase in the density of mobile dislocations introduced by pre-strain was the main reason for the increase in creep rate. The predicted steady-state creep rates showed good agreement with the experiment data; the creep model proposed in this study could capture the pre-strain effect. |
| first_indexed | 2024-03-11T03:32:32Z |
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| id | doaj.art-a62a8c51a63b4f978c1d39c7faa02394 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T03:32:32Z |
| publishDate | 2023-05-01 |
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| spelling | doaj.art-a62a8c51a63b4f978c1d39c7faa023942023-11-18T02:17:31ZengMDPI AGMaterials1996-19442023-05-011610387410.3390/ma16103874Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96Hao Wang0Jingyu Zhang1Huashan Shang2Aixue Sha3Yangyang Cheng4Huiling Duan5Beijing Institute of Aeronautical Materials, AECC, Beijing 100095, ChinaState Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, BIC-ESAT, College of Engineering, Peking University, Beijing 100871, ChinaBeijing Institute of Aeronautical Materials, AECC, Beijing 100095, ChinaBeijing Institute of Aeronautical Materials, AECC, Beijing 100095, ChinaState Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, BIC-ESAT, College of Engineering, Peking University, Beijing 100871, ChinaState Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, BIC-ESAT, College of Engineering, Peking University, Beijing 100871, ChinaFGH96 is a powder metallurgy Ni-based superalloy used for turbine disks of aero-engines. In the present study, room-temperature pre-tension experiments with various plastic strain were conducted for the P/M FGH96 alloy, and subsequent creep tests were conducted under the test conditions of 700 °C and 690 MPa. The microstructures of the pre-strained specimens after room-temperature pre-strain and after 70 h creep were investigated. A steady-state creep rate model was proposed, considering the micro-twinning mechanism and pre-strain effects. Progressive increases in steady-state creep rate and creep stain within 70 h were found with increasing amounts of pre-strain. Room-temperature pre-tension within 6.04% plastic strain had no obvious influence on the morphology and distribution of γ′ precipitates, although the dislocation density continuously increased with the increase in pre-strains. The increase in the density of mobile dislocations introduced by pre-strain was the main reason for the increase in creep rate. The predicted steady-state creep rates showed good agreement with the experiment data; the creep model proposed in this study could capture the pre-strain effect.https://www.mdpi.com/1996-1944/16/10/3874P/M FGH96 superalloycreeppre-strainmicro-twinning |
| spellingShingle | Hao Wang Jingyu Zhang Huashan Shang Aixue Sha Yangyang Cheng Huiling Duan Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96 Materials P/M FGH96 superalloy creep pre-strain micro-twinning |
| title | Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96 |
| title_full | Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96 |
| title_fullStr | Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96 |
| title_full_unstemmed | Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96 |
| title_short | Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96 |
| title_sort | experiment and modelling of the pre strain effect on the creep behaviour of p m ni based superalloy fgh96 |
| topic | P/M FGH96 superalloy creep pre-strain micro-twinning |
| url | https://www.mdpi.com/1996-1944/16/10/3874 |
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