Superb creep lives of Ni-based single crystal superalloy through size effects and strengthening heterostructure γ/γʹ interfaces
This study presents a design strategy to enhance the high-temperature creep resistance of Ni-based superalloys. This strategy focuses on two principles: (1) minimizing the dimensions of γ/γ′ interfaces and γ channels by reducing the size of the γ′ phase; (2) key alloy composition control to strength...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Science Press
2023-12-01
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| Series: | National Science Open |
| Subjects: | |
| Online Access: | https://www.sciengine.com/doi/10.1360/nso/20230042 |
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| Summary: | This study presents a design strategy to enhance the high-temperature creep resistance of Ni-based superalloys. This strategy focuses on two principles: (1) minimizing the dimensions of γ/γ′ interfaces and γ channels by reducing the size of the γ′ phase; (2) key alloy composition control to strengthen the heterostructure γ/γ′ interfaces. This strategy proved very effective by the designed three superalloys’ prolonged creep lives. An alloy exhibits ultra-long creep life by <sc>388 h</sc> at 1100°C/<sc>137 MPa,</sc> which runs at the highest level among those alloys without Ru addition. With Ru addition, an alloy that lasted for <sc>748 h</sc> with a creep strain of ~6% at 1110°C/<sc>137 MPa</sc> is developed. This study provides a new route of high-temperature creep lives through heterostructure interfacial design with size effects and key alloying elements. |
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| ISSN: | 2097-1168 |