On the influence of Nb/Ti ratio on environmentally-assisted crack growth in high-strength nickel-based superalloys
The effect of Nb/Ti ratio on environmentally-assisted crack growth of three prototype Ni-based superalloys is studied. For these alloys, the yield strength is unaltered with increasing Nb/Ti ratio due to an increase in grain size. This situation has allowed the rationalization of the factors influen...
| Main Authors: | , , , , , , , |
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| Format: | Journal article |
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Springer
2018
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| _version_ | 1826306403408543744 |
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| author | Németh, AAN Crudden, DJ Collins, DM Kuksenko, V Liebscher, CH Armstrong, DEJ Wilkinson, AJ Reed, RC |
| author_facet | Németh, AAN Crudden, DJ Collins, DM Kuksenko, V Liebscher, CH Armstrong, DEJ Wilkinson, AJ Reed, RC |
| author_sort | Németh, AAN |
| collection | OXFORD |
| description | The effect of Nb/Ti ratio on environmentally-assisted crack growth of three prototype Ni-based superalloys is studied. For these alloys, the yield strength is unaltered with increasing Nb/Ti ratio due to an increase in grain size. This situation has allowed the rationalization of the factors influencing damage tolerance at 700 °C. Primary intergranular cracks have been investigated using energy-dispersive X-ray spectroscopy in a scanning transmission electron microscope and the analysis of electron back-scatter diffraction patterns. Any possible detrimental effect of Nb on the observed crack tip damage due to Nb-rich oxide formation is not observed. Instead, evidence is presented to indicate that the tertiary γ′-precipitates are dissolving ahead of the crack consistent with the formation of oxides such as alumina and rutile. Our results have implications for alloy design efforts; at any given strength level, both more and less damage-tolerant variants of these alloys can be designed. |
| first_indexed | 2024-03-07T06:47:26Z |
| format | Journal article |
| id | oxford-uuid:fb5745bb-943a-49eb-a99e-e1197df6c40a |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:47:26Z |
| publishDate | 2018 |
| publisher | Springer |
| record_format | dspace |
| spelling | oxford-uuid:fb5745bb-943a-49eb-a99e-e1197df6c40a2022-03-27T13:13:05ZOn the influence of Nb/Ti ratio on environmentally-assisted crack growth in high-strength nickel-based superalloysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:fb5745bb-943a-49eb-a99e-e1197df6c40aSymplectic Elements at OxfordSpringer2018Németh, AANCrudden, DJCollins, DMKuksenko, VLiebscher, CHArmstrong, DEJWilkinson, AJReed, RCThe effect of Nb/Ti ratio on environmentally-assisted crack growth of three prototype Ni-based superalloys is studied. For these alloys, the yield strength is unaltered with increasing Nb/Ti ratio due to an increase in grain size. This situation has allowed the rationalization of the factors influencing damage tolerance at 700 °C. Primary intergranular cracks have been investigated using energy-dispersive X-ray spectroscopy in a scanning transmission electron microscope and the analysis of electron back-scatter diffraction patterns. Any possible detrimental effect of Nb on the observed crack tip damage due to Nb-rich oxide formation is not observed. Instead, evidence is presented to indicate that the tertiary γ′-precipitates are dissolving ahead of the crack consistent with the formation of oxides such as alumina and rutile. Our results have implications for alloy design efforts; at any given strength level, both more and less damage-tolerant variants of these alloys can be designed. |
| spellingShingle | Németh, AAN Crudden, DJ Collins, DM Kuksenko, V Liebscher, CH Armstrong, DEJ Wilkinson, AJ Reed, RC On the influence of Nb/Ti ratio on environmentally-assisted crack growth in high-strength nickel-based superalloys |
| title | On the influence of Nb/Ti ratio on environmentally-assisted crack growth in high-strength nickel-based superalloys |
| title_full | On the influence of Nb/Ti ratio on environmentally-assisted crack growth in high-strength nickel-based superalloys |
| title_fullStr | On the influence of Nb/Ti ratio on environmentally-assisted crack growth in high-strength nickel-based superalloys |
| title_full_unstemmed | On the influence of Nb/Ti ratio on environmentally-assisted crack growth in high-strength nickel-based superalloys |
| title_short | On the influence of Nb/Ti ratio on environmentally-assisted crack growth in high-strength nickel-based superalloys |
| title_sort | on the influence of nb ti ratio on environmentally assisted crack growth in high strength nickel based superalloys |
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