About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
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Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
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Presentation Title |
ON DEMAND: High-temperature Gas Corrosion at 800 °C in H2O-O2-SO2 of CrMnFeCoNi (HEA) and CrCoNi (MEA) |
Author(s) |
Wencke Schulz, Stephanos Karafiludis, Guillaume Laplanche, Mike Schneider, Christiane Stephan-Scherb, Anna Maria Manzoni |
On-Site Speaker (Planned) |
Anna Maria Manzoni |
Abstract Scope |
The high-entropy alloy Cr20Mn20Fe20Co20Ni20 (HEA) and the medium-entropy alloy Cr33Co33Ni33 (MEA) exhibit excellent mechanical properties and are considered for high-temperature applications. Both materials were exposed in a mixed gas atmosphere of Ar-10% H2O-2% O2-0.5% SO2 [Vol.%] at 800 °C for up to 96 h. The oxide scales formed on the quinary alloy (HEA) are systematically and significantly thicker (up to 31 µm) than those on the ternary alloy (MEA). The CrCoNi alloy developed a very thin discontinuous Cr2O3 layer (<1 µm). The scales on HEA-CrMnFeCoNi are composed of an outer, porous layer (Mn3O4 and MnSO4), a thin Cr2O3 layer at the alloy interface and an intermediate Mn3O4 layer. This comparative study shows that the medium entropy CrCoNi alloy forms a protective chromia layer at 800 °C under the corrosive conditions investigated (96 h in Ar-H20-O2-SO2) and is thus more resistant to corrosive gases than the high entropy CrMnFeCoNi alloy. |
Proceedings Inclusion? |
Undecided |