Effects of short-term overloading or overheating during secondary creep on the creep behavior and microstructural evolution of the nickel-based single-crystal superalloy DD6.
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| Title: | Effects of short-term overloading or overheating during secondary creep on the creep behavior and microstructural evolution of the nickel-based single-crystal superalloy DD6. |
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| Authors: | Wang, Xiao1,2 (AUTHOR), Tan, Yidie1,2 (AUTHOR), Zhao, Jianjiang1,3 (AUTHOR), Wang, Fei1,3 (AUTHOR) wang.fei@zju.edu.cn, Chen, Yunmin1,3 (AUTHOR), Wei, Hua1,3 (AUTHOR) huawei@zju.edu.cn |
| Source: | Journal of Materials Science. Aug2026, Vol. 61 Issue 30, p22361-22378. 18p. |
| Subjects: | Microstructure, Dislocation structure, Turbine blades, Phase transitions, Nickel alloys, Thermal stresses, Strains & stresses (Mechanics), Mechanical loads |
| Abstract: | In service, aero-engine turbine blades are frequently subjected to transient thermal and mechanical excursions superimposed on long-term creep loading; however, the associated microstructural degradation mechanisms remain insufficiently understood. This study investigates the influence of short-term overloading or overheating on the creep behavior and microstructural evolution of the nickel-based single crystal superalloy DD6. Creep tests were conducted at 1050 °C and 150 MPa, with overloading (200 MPa for 20 h) or overheating (1150 °C for 0.5 h) applied during the secondary creep stage. Overloading markedly accelerated creep strain accumulation, fragmented the γ matrix into discrete segments, increased γ/γ' interfacial incoherency, and promoted the formation of dense interfacial dislocation networks. The elevated strain energy further enhanced γ' shearing during tertiary creep, facilitating the nucleation of subgrain boundaries within the γ' phase. Short-term overheating similarly increased the creep rate but additionally induced partial γ' dissolution, reducing its volume fraction and widening γ channels. The transient thermal spike enhanced dislocation mobility and annihilation, temporarily lowering the dislocation density. However, the weakened γ' precipitates exhibited diminished resistance to dislocation cutting at later creep stages, leading to severe dislocation entanglement, extensive subgrain boundary formation, and the development of high-density dislocation networks within the γ' phase. Collectively, these results elucidate the distinct damage pathways associated with transient overloading and overheating and provide a microstructural basis for more accurate life assessment and optimized design of nickel-based single-crystal turbine blade superalloys. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 194868788 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effects of short-term overloading or overheating during secondary creep on the creep behavior and microstructural evolution of the nickel-based single-crystal superalloy DD6. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Wang%2C+Xiao%22">Wang, Xiao</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tan%2C+Yidie%22">Tan, Yidie</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Jianjiang%22">Zhao, Jianjiang</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Fei%22">Wang, Fei</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> wang.fei@zju.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Chen%2C+Yunmin%22">Chen, Yunmin</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wei%2C+Hua%22">Wei, Hua</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> huawei@zju.edu.cn</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%22">Journal of Materials Science</searchLink>. Aug2026, Vol. 61 Issue 30, p22361-22378. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+structure%22">Dislocation structure</searchLink><br /><searchLink fieldCode="DE" term="%22Turbine+blades%22">Turbine blades</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Nickel+alloys%22">Nickel alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stresses%22">Thermal stresses</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+loads%22">Mechanical loads</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In service, aero-engine turbine blades are frequently subjected to transient thermal and mechanical excursions superimposed on long-term creep loading; however, the associated microstructural degradation mechanisms remain insufficiently understood. This study investigates the influence of short-term overloading or overheating on the creep behavior and microstructural evolution of the nickel-based single crystal superalloy DD6. Creep tests were conducted at 1050 °C and 150 MPa, with overloading (200 MPa for 20 h) or overheating (1150 °C for 0.5 h) applied during the secondary creep stage. Overloading markedly accelerated creep strain accumulation, fragmented the γ matrix into discrete segments, increased γ/γ' interfacial incoherency, and promoted the formation of dense interfacial dislocation networks. The elevated strain energy further enhanced γ' shearing during tertiary creep, facilitating the nucleation of subgrain boundaries within the γ' phase. Short-term overheating similarly increased the creep rate but additionally induced partial γ' dissolution, reducing its volume fraction and widening γ channels. The transient thermal spike enhanced dislocation mobility and annihilation, temporarily lowering the dislocation density. However, the weakened γ' precipitates exhibited diminished resistance to dislocation cutting at later creep stages, leading to severe dislocation entanglement, extensive subgrain boundary formation, and the development of high-density dislocation networks within the γ' phase. Collectively, these results elucidate the distinct damage pathways associated with transient overloading and overheating and provide a microstructural basis for more accurate life assessment and optimized design of nickel-based single-crystal turbine blade superalloys. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s10853-026-13129-5 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 22361 Subjects: – SubjectFull: Microstructure Type: general – SubjectFull: Dislocation structure Type: general – SubjectFull: Turbine blades Type: general – SubjectFull: Phase transitions Type: general – SubjectFull: Nickel alloys Type: general – SubjectFull: Thermal stresses Type: general – SubjectFull: Strains & stresses (Mechanics) Type: general – SubjectFull: Mechanical loads Type: general Titles: – TitleFull: Effects of short-term overloading or overheating during secondary creep on the creep behavior and microstructural evolution of the nickel-based single-crystal superalloy DD6. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Wang, Xiao – PersonEntity: Name: NameFull: Tan, Yidie – PersonEntity: Name: NameFull: Zhao, Jianjiang – PersonEntity: Name: NameFull: Wang, Fei – PersonEntity: Name: NameFull: Chen, Yunmin – PersonEntity: Name: NameFull: Wei, Hua IsPartOfRelationships: – BibEntity: Dates: – D: 08 M: 08 Text: Aug2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00222461 Numbering: – Type: volume Value: 61 – Type: issue Value: 30 Titles: – TitleFull: Journal of Materials Science Type: main |
| ResultId | 1 |
