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Creep degradation in oxide-dispersion-strengthened alloys
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Whittenberger, J. D. |
| Copyright Year | 1977 |
| Description | Oxide dispersion strengthened Ni-base alloys in wrought bar form are studied for creep degradation effects similar to those found in thin gage sheet. The bar products evaluated included ODS-Ni, ODS-NiCr, and three types of advanced ODS-NiCrAl alloys. Tensile test specimens were exposed to creep at various stress levels at 1365 K and then tensile tested at room temperature. Low residual tensile properties, change in fracture mode, the appearance of dispersoid-free bands, grain boundary cavitation, and internal oxidation in the microstructure were interpreted as creep degradation effects. This work showed that many ODS alloys are subject to creep damage. Degradation of tensile properties occurred after very small amounts of creep strain, ductility being the most sensitive property. All the ODS alloys which were creep damaged possessed a large grain size. Creep damage appears to have been due to diffusional creep which produced dispersoid-free bands around boundaries acting as vacancy sources. Low angle and possibly twin boundaries acted as vacancy sources. |
| File Size | 2549145 |
| Page Count | 39 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770012267 |
| Archival Resource Key | ark:/13960/t22c3t362 |
| Language | English |
| Publisher Date | 1977-03-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Grain Boundaries Creep Properties Nickel Alloys Aluminum Alloys Oxides Chromium Alloys Oxide Dispersion Strengthening Bars Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
