Fatigue fracture mechanism of Ni-base superalloy GH4065A at elevated temperatures
GH4065A is a newly developed high-performance cast-wrought Ni-base superalloy with ultra-low C and N content used for advanced turbine engine disc. In this study， the alloy’s inclusions of the alloy are characterized and statistically analyzed. To investigate the fatigue fracture mechanism， strain-c...
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Journal of Materials Engineering
2025-01-01
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| Series: | Cailiao gongcheng |
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| Online Access: | https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000321 |
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| author | LI Linhan ZHANG Ji ZHANG Wenyun TIAN Qiang QIN Heyong ZHANG Beijiang |
| author_facet | LI Linhan ZHANG Ji ZHANG Wenyun TIAN Qiang QIN Heyong ZHANG Beijiang |
| author_sort | LI Linhan |
| collection | DOAJ |
| description | GH4065A is a newly developed high-performance cast-wrought Ni-base superalloy with ultra-low C and N content used for advanced turbine engine disc. In this study， the alloy’s inclusions of the alloy are characterized and statistically analyzed. To investigate the fatigue fracture mechanism， strain-controlled fatigue tests are conducted at 400 ℃ and 650 ℃ on the fine-grained and coarse-grained samples respectively. The results show that the alloy’s inclusions of the alloy are mainly nitrides. For the fine-grained samples， discrete nitride particles and clustered nitrides both with a critical size larger than the average grain size are responsible for the fatigue crack initiation. When subjected to high-level strains （≥0.9%）， fatigue failure primarily originates from surface nitrides， with rare occurrences of boride and oxide initiation. Surface crack induced by Al2O3， rather than boride or MgSiO3， is found to significantly reduce the fatigue life. Higher fatigue temperature results in reduced life cycles. When under lower levels of strain， however， subsurface/internal nitride-facet initiations dominate and fatigue life is prolonged by the elevated temperature. In the coarse-grained samples， fatigue failures at 400 ℃ are found to be initiated by quasi-cleavage cracking mechanism. Due to the increased grain size， the inclusion-induced crack initiation is suppressed while slip-induced cleavage cracking mechanism becomes predominant. |
| format | Article |
| id | doaj-art-94b3f6749cf74893ad51b9e216f0f9e5 |
| institution | Kabale University |
| issn | 1001-4381 |
| language | zho |
| publishDate | 2025-01-01 |
| publisher | Journal of Materials Engineering |
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| series | Cailiao gongcheng |
| spelling | doaj-art-94b3f6749cf74893ad51b9e216f0f9e52025-01-21T09:44:41ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43812025-01-01531728010.11868/j.issn.1001-4381.2024.0003211001-4381（2025）01-0072-09Fatigue fracture mechanism of Ni-base superalloy GH4065A at elevated temperaturesLI Linhan0ZHANG Ji1ZHANG Wenyun2TIAN Qiang3QIN Heyong4ZHANG Beijiang5High Temperature Materials Research Institute，Central Iron and Steel Research Institute Company Limited，Beijing 100081，ChinaHigh Temperature Materials Research Institute，Central Iron and Steel Research Institute Company Limited，Beijing 100081，ChinaHigh Temperature Materials Research Institute，Central Iron and Steel Research Institute Company Limited，Beijing 100081，ChinaHigh Temperature Materials Research Institute，Central Iron and Steel Research Institute Company Limited，Beijing 100081，ChinaHigh Temperature Materials Research Institute，Central Iron and Steel Research Institute Company Limited，Beijing 100081，ChinaHigh Temperature Materials Research Institute，Central Iron and Steel Research Institute Company Limited，Beijing 100081，ChinaGH4065A is a newly developed high-performance cast-wrought Ni-base superalloy with ultra-low C and N content used for advanced turbine engine disc. In this study， the alloy’s inclusions of the alloy are characterized and statistically analyzed. To investigate the fatigue fracture mechanism， strain-controlled fatigue tests are conducted at 400 ℃ and 650 ℃ on the fine-grained and coarse-grained samples respectively. The results show that the alloy’s inclusions of the alloy are mainly nitrides. For the fine-grained samples， discrete nitride particles and clustered nitrides both with a critical size larger than the average grain size are responsible for the fatigue crack initiation. When subjected to high-level strains （≥0.9%）， fatigue failure primarily originates from surface nitrides， with rare occurrences of boride and oxide initiation. Surface crack induced by Al2O3， rather than boride or MgSiO3， is found to significantly reduce the fatigue life. Higher fatigue temperature results in reduced life cycles. When under lower levels of strain， however， subsurface/internal nitride-facet initiations dominate and fatigue life is prolonged by the elevated temperature. In the coarse-grained samples， fatigue failures at 400 ℃ are found to be initiated by quasi-cleavage cracking mechanism. Due to the increased grain size， the inclusion-induced crack initiation is suppressed while slip-induced cleavage cracking mechanism becomes predominant.https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000321ni-base superalloyfatigueinclusionnitridecrack initiation |
| spellingShingle | LI Linhan ZHANG Ji ZHANG Wenyun TIAN Qiang QIN Heyong ZHANG Beijiang Fatigue fracture mechanism of Ni-base superalloy GH4065A at elevated temperatures Cailiao gongcheng ni-base superalloy fatigue inclusion nitride crack initiation |
| title | Fatigue fracture mechanism of Ni-base superalloy GH4065A at elevated temperatures |
| title_full | Fatigue fracture mechanism of Ni-base superalloy GH4065A at elevated temperatures |
| title_fullStr | Fatigue fracture mechanism of Ni-base superalloy GH4065A at elevated temperatures |
| title_full_unstemmed | Fatigue fracture mechanism of Ni-base superalloy GH4065A at elevated temperatures |
| title_short | Fatigue fracture mechanism of Ni-base superalloy GH4065A at elevated temperatures |
| title_sort | fatigue fracture mechanism of ni base superalloy gh4065a at elevated temperatures |
| topic | ni-base superalloy fatigue inclusion nitride crack initiation |
| url | https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000321 |
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