Microstructural and mechanical properties evolution of alloy C-HRA-2 aging at 800 °C for up to 10,000 h
The microstructural and mechanical properties of alloy C-HRA-2 aged at 800 °C were investigated. For up to 10,000 h, the mechanical properties remain stable. The yield strength is maintained at 410–425 MPa, and the tensile strength is maintained at 840–870 MPa, the elongation and area reduction are...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525004605 |
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| Summary: | The microstructural and mechanical properties of alloy C-HRA-2 aged at 800 °C were investigated. For up to 10,000 h, the mechanical properties remain stable. The yield strength is maintained at 410–425 MPa, and the tensile strength is maintained at 840–870 MPa, the elongation and area reduction are maintained at 40–45 %, and the impact toughness is maintained at 125–145 J. The main precipitate during the aging is M23C6, which is mainly needle/rod-shaped at the interior grain and granular at the grain boundary. A small amount of M6C and MX phases are also found at the grain boundary. After long-term aging, the needle/rod M23C6 gradually evolved into granular M23C6. The contribution to the alloy’s yield strength during the aging process mainly comes from solid solution strengthening (around 220–230 MPa) and M23C6 precipitation strengthening (around 110–120 MPa). Compared with the alloy aged at 700 °C, its yield strength after aging at 800 °C is reduced by about 50 MPa. The main reason is that the needle/rod M23C6 in the grain becomes coarser at higher temperatures. |
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| ISSN: | 0264-1275 |