Dramatically improving thermoplasticity of FGH4096 superalloy by a novel sub-solvus temperature holding followed by extremely slow cooling
In this work, the thermoplasticity of hot extruded (HEXed) FGH4096 superalloy was greatly enhanced by sub-solvus temperature holding followed by extremely slow cooling (S-ESC). After S-ESC processing, the dispersed fine γ′ precipitates inside the grains and grain boundaries obviously grow up. Under...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423006178 |
| _version_ | 1797798785918697472 |
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| author | Zhiling Liu Wei Liu Hua Zhang Jingjing Ruan Hailiang Huang Xin Zhou Fanchao Meng Shangzhou Zhang Liang Jiang |
| author_facet | Zhiling Liu Wei Liu Hua Zhang Jingjing Ruan Hailiang Huang Xin Zhou Fanchao Meng Shangzhou Zhang Liang Jiang |
| author_sort | Zhiling Liu |
| collection | DOAJ |
| description | In this work, the thermoplasticity of hot extruded (HEXed) FGH4096 superalloy was greatly enhanced by sub-solvus temperature holding followed by extremely slow cooling (S-ESC). After S-ESC processing, the dispersed fine γ′ precipitates inside the grains and grain boundaries obviously grow up. Under most deformation conditions, the S-ESCed samples exhibit smaller flow stress and larger strain rate sensitive index (m) values than the HEXed samples, especially the peak value of m is 0.75 vs. 0.32. This is because fine γ′ precipitates limit deformation by pinning dislocation, and coarse γ′ precipitates promote dynamic recrystallization (DRX). Under the high strain rate of 1 s−1, the DRX degree of the HEXed sample is greatly affected by temperature, while the S-ESCed samples maintain a high DRX degree at different temperature. At the high temperature of 1100 °C, the S-ESCed samples exhibit smaller grain sizes and higher DRX degrees than the HEXed sample under low strain rates. More importantly, because the γ′ precipitates promote DRX, the S-ESCed sample achieves superplasticity at 1090 °C and 10−3 s−1. |
| first_indexed | 2024-03-13T04:10:09Z |
| format | Article |
| id | doaj.art-1d94241de4f34351912d8b0d8de2c556 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-13T04:10:09Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-1d94241de4f34351912d8b0d8de2c5562023-06-21T06:56:05ZengElsevierJournal of Materials Research and Technology2238-78542023-05-012419731990Dramatically improving thermoplasticity of FGH4096 superalloy by a novel sub-solvus temperature holding followed by extremely slow coolingZhiling Liu0Wei Liu1Hua Zhang2Jingjing Ruan3Hailiang Huang4Xin Zhou5Fanchao Meng6Shangzhou Zhang7Liang Jiang8Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, ChinaCorresponding author.; Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, ChinaIn this work, the thermoplasticity of hot extruded (HEXed) FGH4096 superalloy was greatly enhanced by sub-solvus temperature holding followed by extremely slow cooling (S-ESC). After S-ESC processing, the dispersed fine γ′ precipitates inside the grains and grain boundaries obviously grow up. Under most deformation conditions, the S-ESCed samples exhibit smaller flow stress and larger strain rate sensitive index (m) values than the HEXed samples, especially the peak value of m is 0.75 vs. 0.32. This is because fine γ′ precipitates limit deformation by pinning dislocation, and coarse γ′ precipitates promote dynamic recrystallization (DRX). Under the high strain rate of 1 s−1, the DRX degree of the HEXed sample is greatly affected by temperature, while the S-ESCed samples maintain a high DRX degree at different temperature. At the high temperature of 1100 °C, the S-ESCed samples exhibit smaller grain sizes and higher DRX degrees than the HEXed sample under low strain rates. More importantly, because the γ′ precipitates promote DRX, the S-ESCed sample achieves superplasticity at 1090 °C and 10−3 s−1.http://www.sciencedirect.com/science/article/pii/S2238785423006178FGH4096 superalloyγ′ precipitatesDynamic recrystallizationSuperplasticity |
| spellingShingle | Zhiling Liu Wei Liu Hua Zhang Jingjing Ruan Hailiang Huang Xin Zhou Fanchao Meng Shangzhou Zhang Liang Jiang Dramatically improving thermoplasticity of FGH4096 superalloy by a novel sub-solvus temperature holding followed by extremely slow cooling Journal of Materials Research and Technology FGH4096 superalloy γ′ precipitates Dynamic recrystallization Superplasticity |
| title | Dramatically improving thermoplasticity of FGH4096 superalloy by a novel sub-solvus temperature holding followed by extremely slow cooling |
| title_full | Dramatically improving thermoplasticity of FGH4096 superalloy by a novel sub-solvus temperature holding followed by extremely slow cooling |
| title_fullStr | Dramatically improving thermoplasticity of FGH4096 superalloy by a novel sub-solvus temperature holding followed by extremely slow cooling |
| title_full_unstemmed | Dramatically improving thermoplasticity of FGH4096 superalloy by a novel sub-solvus temperature holding followed by extremely slow cooling |
| title_short | Dramatically improving thermoplasticity of FGH4096 superalloy by a novel sub-solvus temperature holding followed by extremely slow cooling |
| title_sort | dramatically improving thermoplasticity of fgh4096 superalloy by a novel sub solvus temperature holding followed by extremely slow cooling |
| topic | FGH4096 superalloy γ′ precipitates Dynamic recrystallization Superplasticity |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423006178 |
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