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Preliminary study of thermomechanical fatigue of polycrystalline MAR-M 200Thermomechanical 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.
Document ID
19840009282
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Bill, R. C. (USAAVSCOM Research and Technology Labs. Cleveland, OH, United States)
Verrilli, M. J. (Northwestern Univ. Cleveland, OH, United States)
Mcgaw, M. A. (NASA Lewis Research Center)
Halford, G. R. (NASA Lewis Research Center)
Date Acquired
September 4, 2013
Publication Date
February 1, 1984
Subject Category
Metallic Materials
Report/Patent Number
NASA-TP-2280
NAS 1.60:2280
E-1795
AVSCOM-TR-83-C-6
Accession Number
84N17350
Funding Number(s)
PROJECT: RTOP 505-33-22
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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