Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications
The oxidation resistance of three prototype single-crystal nickel-based superalloys for industrial (electricity-generating) gas turbine applications is studied. All contain greater quantities of Cr than in most existing single-crystal superalloys; two are alloyed with Si. All alloys are found to be...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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2011
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| _version_ | 1797094889791422464 |
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| author | Sato, A Chiu, Y Reed, R |
| author_facet | Sato, A Chiu, Y Reed, R |
| author_sort | Sato, A |
| collection | OXFORD |
| description | The oxidation resistance of three prototype single-crystal nickel-based superalloys for industrial (electricity-generating) gas turbine applications is studied. All contain greater quantities of Cr than in most existing single-crystal superalloys; two are alloyed with Si. All alloys are found to be marginal Al 2O 3-formers, with the performance being better at 1000 °C rather than 900 °C, and when Si is added. Microstructural analysis indicates that the ability to form an Al 2O 3 layer is better in the interdendritic regions; the dendritic regions are prone to internal oxidation. In all cases, an outer scale of Cr 2O 3 is formed which is in contact with either Ta 2O 5 (at 1000 °C) or NiTa 2O 6 (at 900 °C). To explain the results, the factors known to influence the rate of Al 2O 3 scale formation are considered. A model is developed to predict whether any given alloy composition will form a continuous Al 2O 3 scale. This is used to rationalize the dependence of Al 2O 3 scale formation on alloy composition in these systems. It is useful for the purposes of alloy design. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| first_indexed | 2024-03-07T04:20:08Z |
| format | Journal article |
| id | oxford-uuid:cabdb662-cbd7-4aba-97f5-c20ba0bc934f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:20:08Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:cabdb662-cbd7-4aba-97f5-c20ba0bc934f2022-03-27T07:09:34ZOxidation of nickel-based single-crystal superalloys for industrial gas turbine applicationsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:cabdb662-cbd7-4aba-97f5-c20ba0bc934fEnglishSymplectic Elements at Oxford2011Sato, AChiu, YReed, RThe oxidation resistance of three prototype single-crystal nickel-based superalloys for industrial (electricity-generating) gas turbine applications is studied. All contain greater quantities of Cr than in most existing single-crystal superalloys; two are alloyed with Si. All alloys are found to be marginal Al 2O 3-formers, with the performance being better at 1000 °C rather than 900 °C, and when Si is added. Microstructural analysis indicates that the ability to form an Al 2O 3 layer is better in the interdendritic regions; the dendritic regions are prone to internal oxidation. In all cases, an outer scale of Cr 2O 3 is formed which is in contact with either Ta 2O 5 (at 1000 °C) or NiTa 2O 6 (at 900 °C). To explain the results, the factors known to influence the rate of Al 2O 3 scale formation are considered. A model is developed to predict whether any given alloy composition will form a continuous Al 2O 3 scale. This is used to rationalize the dependence of Al 2O 3 scale formation on alloy composition in these systems. It is useful for the purposes of alloy design. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| spellingShingle | Sato, A Chiu, Y Reed, R Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications |
| title | Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications |
| title_full | Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications |
| title_fullStr | Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications |
| title_full_unstemmed | Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications |
| title_short | Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications |
| title_sort | oxidation of nickel based single crystal superalloys for industrial gas turbine applications |
| work_keys_str_mv | AT satoa oxidationofnickelbasedsinglecrystalsuperalloysforindustrialgasturbineapplications AT chiuy oxidationofnickelbasedsinglecrystalsuperalloysforindustrialgasturbineapplications AT reedr oxidationofnickelbasedsinglecrystalsuperalloysforindustrialgasturbineapplications |