Microstructure and mechanical properties of a new nickel-based single crystal superalloy
To obtain higher comprehensive mechanical properties while avoid the adverse effects of Re element on the microstructure and economy of the alloy, a Re-free nickel-based single crystal superalloy is developed based on the Rene N5 single crystal superalloy. The microstructure evolution, compression p...
| Autores principales: | , , , , , , , |
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| Formato: | Artículo |
| Lenguaje: | English |
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Elsevier
2020-09-01
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| Colección: | Journal of Materials Research and Technology |
| Materias: | |
| Acceso en línea: | http://www.sciencedirect.com/science/article/pii/S2238785420316392 |
| _version_ | 1829482132223819776 |
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| author | Zhao Shang Xianping Wei Dazhuo Song Juntao Zou Shuhua Liang Gang Liu Liping Nie Xiufang Gong |
| author_facet | Zhao Shang Xianping Wei Dazhuo Song Juntao Zou Shuhua Liang Gang Liu Liping Nie Xiufang Gong |
| author_sort | Zhao Shang |
| collection | DOAJ |
| description | To obtain higher comprehensive mechanical properties while avoid the adverse effects of Re element on the microstructure and economy of the alloy, a Re-free nickel-based single crystal superalloy is developed based on the Rene N5 single crystal superalloy. The microstructure evolution, compression properties, tensile properties, deformation mechanism and fracture behaviour of the self-designed alloy are investigated. The experimental results show that after the complete heat treatment, cuboidal γ′ precipitates with high degree of regular morphology are formed. The size of γ′ precipitates is about 0.49 μm, and the volume fraction is approximately 61%, which are better than those for a conventional second generation single crystal superalloy. The alloy reaches its maximum compressive and tensile strength at 760 °C and shows excellent microstructure thermal stability and improved mechanical properties. The alloy has an obvious strain hardening stage when the temperature is lower than 760 °C, while the softening stage is not obvious. When the temperature reaches 850 °C, the stress–strain curve of the sample mainly shows that the variable stress increases abruptly at the beginning and then decreases immediately. The tensile fracture of a single crystal at medium and low temperature is characterized by a slip fracture with a certain plastic deformation. A high temperature tensile fracture is characterized by typical plastic deformation, and its mechanism is a creep fracture with a uniform deformation. |
| first_indexed | 2024-12-14T21:42:06Z |
| format | Article |
| id | doaj.art-6ee1a09f19e348b199e29b8be93cc33c |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-14T21:42:06Z |
| publishDate | 2020-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-6ee1a09f19e348b199e29b8be93cc33c2022-12-21T22:46:26ZengElsevierJournal of Materials Research and Technology2238-78542020-09-01951164111649Microstructure and mechanical properties of a new nickel-based single crystal superalloyZhao Shang0Xianping Wei1Dazhuo Song2Juntao Zou3Shuhua Liang4Gang Liu5Liping Nie6Xiufang Gong7State Key Laboratory of Long-life High Temperature Materials, Dong Fang Turbine Co., Ltd., Deyang 618000, PR China; School of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, PR ChinaState Key Laboratory of Long-life High Temperature Materials, Dong Fang Turbine Co., Ltd., Deyang 618000, PR China; Corresponding authors.School of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, PR ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, PR China; Corresponding authors.School of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, PR ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, PR ChinaState Key Laboratory of Long-life High Temperature Materials, Dong Fang Turbine Co., Ltd., Deyang 618000, PR ChinaState Key Laboratory of Long-life High Temperature Materials, Dong Fang Turbine Co., Ltd., Deyang 618000, PR China; Corresponding authors.To obtain higher comprehensive mechanical properties while avoid the adverse effects of Re element on the microstructure and economy of the alloy, a Re-free nickel-based single crystal superalloy is developed based on the Rene N5 single crystal superalloy. The microstructure evolution, compression properties, tensile properties, deformation mechanism and fracture behaviour of the self-designed alloy are investigated. The experimental results show that after the complete heat treatment, cuboidal γ′ precipitates with high degree of regular morphology are formed. The size of γ′ precipitates is about 0.49 μm, and the volume fraction is approximately 61%, which are better than those for a conventional second generation single crystal superalloy. The alloy reaches its maximum compressive and tensile strength at 760 °C and shows excellent microstructure thermal stability and improved mechanical properties. The alloy has an obvious strain hardening stage when the temperature is lower than 760 °C, while the softening stage is not obvious. When the temperature reaches 850 °C, the stress–strain curve of the sample mainly shows that the variable stress increases abruptly at the beginning and then decreases immediately. The tensile fracture of a single crystal at medium and low temperature is characterized by a slip fracture with a certain plastic deformation. A high temperature tensile fracture is characterized by typical plastic deformation, and its mechanism is a creep fracture with a uniform deformation.http://www.sciencedirect.com/science/article/pii/S2238785420316392Single crystal superalloyMicrostructure evolutionMechanical propertiesFracture behaviour |
| spellingShingle | Zhao Shang Xianping Wei Dazhuo Song Juntao Zou Shuhua Liang Gang Liu Liping Nie Xiufang Gong Microstructure and mechanical properties of a new nickel-based single crystal superalloy Journal of Materials Research and Technology Single crystal superalloy Microstructure evolution Mechanical properties Fracture behaviour |
| title | Microstructure and mechanical properties of a new nickel-based single crystal superalloy |
| title_full | Microstructure and mechanical properties of a new nickel-based single crystal superalloy |
| title_fullStr | Microstructure and mechanical properties of a new nickel-based single crystal superalloy |
| title_full_unstemmed | Microstructure and mechanical properties of a new nickel-based single crystal superalloy |
| title_short | Microstructure and mechanical properties of a new nickel-based single crystal superalloy |
| title_sort | microstructure and mechanical properties of a new nickel based single crystal superalloy |
| topic | Single crystal superalloy Microstructure evolution Mechanical properties Fracture behaviour |
| url | http://www.sciencedirect.com/science/article/pii/S2238785420316392 |
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