Improved resistance to high-temperature oxidation in a fine-grained CrMnFeCoNi high-entropy alloy additively manufactured by laser powder bed fusion
The high-temperature oxidation behavior of a fine-grained CrMnFeCoNi high-entropy alloy (HEA) manufactured by laser powder bed fusion (LPBF) was investigated. The LPBF-built HEA exhibited heterogeneous, fine-grained structures with a single phase. In addition, substructures induced by dislocation ne...
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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/S2238785425016850 |
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| Summary: | The high-temperature oxidation behavior of a fine-grained CrMnFeCoNi high-entropy alloy (HEA) manufactured by laser powder bed fusion (LPBF) was investigated. The LPBF-built HEA exhibited heterogeneous, fine-grained structures with a single phase. In addition, substructures induced by dislocation networks and nanosized oxides were observed within the grains. The fine-grained structure had a positive effect on the resistance to high-temperature oxidation. Oxidation tests were conducted at 900 °C, 1000 °C, and 1100 °C for 24 h, and the L-PBF alloy exhibited significantly lower mass gains compared to its traditionally processed counterpart (THEA). Specifically, the mass gain of the L-PBF alloy were 1.43, 3.50, and 6.47 mg/cm2 at 900, 1000, and 1100 °C, respectively, whereas the THEA sample showed 1.76, 4.45, and 9.09 mg/cm2. Moreover at 1000 °C, the internal oxide scale of the L-PBF alloy (∼50 μm) was approximately 60 % thinner than that of the THEA (∼130 μm). This refined microstructure promoted the formation of a stable and continuous Cr2O3 scale and suppressed the formation of spinel phases, thereby enhancing high-temperature oxidation resistance. By comparing with the oxidation behaviors of HEAs produced by traditional manufacturing processes, we aimed to deepen our understanding of the high-temperature oxidation behavior of HEAs fabricated via the LPBF process. Based on these results, the mechanisms underlying the excellent oxidation resistance of the LPBF-built CrMnFeCoNi HEA are discussed in detail. |
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| ISSN: | 2238-7854 |