Effect of aging temperature on microstructure and properties of maraging steel for ultra-low temperature
An 18Ni(200) maraging steel ingot was prepared using vacuum smelting, and after undergoing forging and two solution treatments at 1000 °C + 800 °C, the effect of aging treatment at 350–600 °C on the evolution of the microstructure and mechanical properties of the alloy was investigated. The results...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425016217 |
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| Summary: | An 18Ni(200) maraging steel ingot was prepared using vacuum smelting, and after undergoing forging and two solution treatments at 1000 °C + 800 °C, the effect of aging treatment at 350–600 °C on the evolution of the microstructure and mechanical properties of the alloy was investigated. The results demonstrate that the martensitic block size increases with increasing aging temperature, and reversed austenite is gradually formed and increased. When the aging temperature is 500 °C, there are a large number of Ni3Mo and Ni3Ti phases in the microstructure, and the yield strengths at room temperature and −196 °C are 1518 MPa and 1932 MPa, and the impact energy is 36.8 J and 8.7 J, respectively, at which time the strength reaches the highest, and the precipitation strengthening effect is significant. When the aging temperature was increased to 550 °C, the yield strengths at room temperature and −196 °C decreased to 1350 MPa and 1720 MPa, which were 11.1 % and 11 % lower; however, the impact energy increased to 53.4 J and 21.5 J, which were 45.1 % and 147.1 % higher. The presence of 23.7 % thin-film reversed austenite in the 550 °C aging-treated specimens effectively modulates the strength-toughness balance. In addition, this paper explores the formation mechanism of reversed austenite and the TRIP effect, and quantitatively evaluates the contribution of precipitation strengthening, dislocation strengthening, and grain boundary strengthening to yield strength. |
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| ISSN: | 2238-7854 |