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Low cycle fatigue of mar-m 200 single crystals at 760 and 870 deg c
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Milligan, W. W. Jayaraman, N. Bill, R. C. |
| Copyright Year | 1984 |
| Description | Fully reversed low cycle fatigue tests were conducted on single crystals of the nickel-base superalloys Mar-M 200 at 760 C and 870 C. At 760 C, planar slip (octahedral) lead to orientation-dependent strain hardening and cyclic lives. Multiple slip crystals strain hardened the most, resulting in relatively high stress ranges and low lives. Single slip crystals strain hardened the least, resulting in relatively low stress ranges and higher lives. A preferential crack initiation site which was related to slip plane geometry was observed in single slip orientated crystals. At 870 C, the trends were quite different, and the slip character was much more homogeneous. As the tensile axis orientation deviated from 001 , the stress ranges increased and the cyclic lives decreased. Two possible mechanisms were proposed to explain the behavior: one is based on Takeuchi and Kuramoto's cube cross-slip model, and the other is based on orientation-dependent creep rates. |
| File Size | 1598881 |
| Page Count | 30 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850010764 |
| Archival Resource Key | ark:/13960/t4jm73p2w |
| Language | English |
| Publisher Date | 1984-01-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Fatigue Tests Single Crystals Tensile Stress Nickel Alloys Crystal Dislocations Anisotropy Heat Resistant Alloys Cyclic Loads Microstructure Fractography Strain Hardening Crack Initiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
