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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2025-07-01
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| author | Soobin Kim Young-Kyun Kim Young Sang Na Kee-Ahn Lee |
| author_facet | Soobin Kim Young-Kyun Kim Young Sang Na Kee-Ahn Lee |
| author_sort | Soobin Kim |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-cf95208b26f243ceb67f1181bc3a517f |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-07-01 |
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| spelling | doaj-art-cf95208b26f243ceb67f1181bc3a517f2025-08-20T03:50:06ZengElsevierJournal of Materials Research and Technology2238-78542025-07-01373303331310.1016/j.jmrt.2025.07.027Improved resistance to high-temperature oxidation in a fine-grained CrMnFeCoNi high-entropy alloy additively manufactured by laser powder bed fusionSoobin Kim0Young-Kyun Kim1Young Sang Na2Kee-Ahn Lee3Department of Materials Science and Engineering, Inha University, Incheon, 22212, Republic of KoreaDepartment of Materials Science and Engineering, Inha University, Incheon, 22212, Republic of Korea; Korea Institute of Materials Science (KIMS), Changwon, 51508, Republic of KoreaKorea Institute of Materials Science (KIMS), Changwon, 51508, Republic of KoreaDepartment of Materials Science and Engineering, Inha University, Incheon, 22212, Republic of Korea; Corresponding author.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.http://www.sciencedirect.com/science/article/pii/S2238785425016850Laser powder bed fusionHigh-entropy alloyHigh-temperature oxidationIn-situ formed oxideMicrostructure |
| spellingShingle | Soobin Kim Young-Kyun Kim Young Sang Na Kee-Ahn Lee Improved resistance to high-temperature oxidation in a fine-grained CrMnFeCoNi high-entropy alloy additively manufactured by laser powder bed fusion Journal of Materials Research and Technology Laser powder bed fusion High-entropy alloy High-temperature oxidation In-situ formed oxide Microstructure |
| title | Improved resistance to high-temperature oxidation in a fine-grained CrMnFeCoNi high-entropy alloy additively manufactured by laser powder bed fusion |
| title_full | Improved resistance to high-temperature oxidation in a fine-grained CrMnFeCoNi high-entropy alloy additively manufactured by laser powder bed fusion |
| title_fullStr | Improved resistance to high-temperature oxidation in a fine-grained CrMnFeCoNi high-entropy alloy additively manufactured by laser powder bed fusion |
| title_full_unstemmed | Improved resistance to high-temperature oxidation in a fine-grained CrMnFeCoNi high-entropy alloy additively manufactured by laser powder bed fusion |
| title_short | Improved resistance to high-temperature oxidation in a fine-grained CrMnFeCoNi high-entropy alloy additively manufactured by laser powder bed fusion |
| title_sort | improved resistance to high temperature oxidation in a fine grained crmnfeconi high entropy alloy additively manufactured by laser powder bed fusion |
| topic | Laser powder bed fusion High-entropy alloy High-temperature oxidation In-situ formed oxide Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425016850 |
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