| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
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| Symposium
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Microstructural Template Consisting of a Face-Centered Cubic Matrix with Ordered Precipitates: Microstructural Evolution and Properties
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| Presentation Title |
Alloying for Corrosion Resistance: the Effect of Manganese and Silicon on a Polycrystalline Nickel-based Superalloy |
| Author(s) |
Stella Pedrazzini, Noel Glaenzer, Mark Hardy, Paul Mignanelli, T. William Clyne, Howard Stone |
| On-Site Speaker (Planned) |
Stella Pedrazzini |
| Abstract Scope |
Nickel superalloys are employed in the hottest part of jet engines and industrial gas turbines for power generation. In these harsh environments, sulphur contamination can occur in-service, causing reductions in the predicted component lifetime. Our work uses environmental exposures and state of the art characterisation to explore the effect of low-level silicon (0.5 wt%) and manganese (1 wt%) additions on the sulphidation and type-2 hot corrosion response of a polycrystalline nickel superalloy.
Silicon was added promote formation of a compact dual-layer chromia-alumina scale that reduced oxidation rate in long-term experimentsand improved resistance to hot corrosion from coupled NaCl + SOx exposure.
Manganese improved oxidation resistance by creating MnCr2O4, which reduced the oxidation rate but did not change the oxide scale morphology. The presence of Mn (a known sulphur scavenger) proved less effective than silicon, reducing the sulphidation and corrosion damage extent but not the overall depth. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |