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Preliminary study of thermomechanical fatigue of polycrystalline mar-m 200
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | McGaw, M. A. Halford, G. R. Verrilli, M. J. Bill, R. C. |
| Copyright Year | 1984 |
| Description | Thermomechanical fatigue (TMF) experiments were conducted on polycrystalline MAR-M 200 over a cyclic temperature range of 500 to 1000 C. Inelastic strain ranges of 0.03 to 0.2 percent were imposed on the specimens. The TMF lives were found to be significantly shorter than isothermal low-cycle-fatigue (LCF) life at the maximum cycle temperature, and in-phase cycling was more damaging than out-of-phase cycling. Extensive crack tip oxidation appeared to play a role in promoting the severity of in-phase cycling. Carbide particle - matrix interface cracking was also observed after in-phase TMF cycling. The applicability of various life prediction models to the TMF results obtained was assessed. It was concluded that current life prediction models based on isothermal data as input must be modified to be applicable to the TMF results. |
| File Size | 10140174 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19840009282 |
| Archival Resource Key | ark:/13960/t3518v275 |
| Language | English |
| Publisher Date | 1984-02-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Grain Boundaries Metal Fatigue Fatigue Life Crack Tips Stress Analysis Polycrystals Thermal Cycling Tests Metallography Thermal Fatigue Fatigue Tests Thermodynamics Heat Resistant Alloys Oxidation Cracking Fracturing Microstructure Fractography Cobalt Alloys 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 |
