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- W2078384485 abstract "Fully reversed strain control fatigue tests were conducted on single crystals of the nickel-base superalloy MAR-M 200 at 760 and 870°C. The γ′ distribution in the alloy was bimodal with the large γ′ size range of about 0.5–1.0 μm and secondary small γ′ size range of about 0.1–0.3 μm. The plastic strain range was held constant, but the orientations of the tensile axes of the specimens were varied. The fatigue behavior was found to be orientation dependent. At 760°C, planar slip (octahedral) led 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 formation site which was related to slip plane geometry was observed in single-slip-oriented 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. This behavior has been explained on the basis of the orientation-dependent creep rates observed in other similar alloys." @default.
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- W2078384485 date "1986-09-01" @default.
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- W2078384485 title "Low cycle fatigue of MAR-M 200 single crystals with a bimodal γ′ distribution at 760 and 870°C" @default.
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- W2078384485 doi "https://doi.org/10.1016/0025-5416(86)90101-1" @default.
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