High Temperature Low Cycle Fatigue of Superalloys Inconel 713LC and Inconel 792-5A
Cylindrical specimens of cast polycrystalline nickel base superalloy Inconel 713 LC and Inconel 792-5A were cyclically strained under total strain control at 23 and 700 °C. Morphology and volume fraction of γ´ precipitates are different in both materials. Cyclic hardening/softening curves, cyclic st...
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Veröffentlicht in: | Key engineering materials 2007-09, Vol.348-349, p.101-104 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Cylindrical specimens of cast polycrystalline nickel base superalloy Inconel 713 LC and
Inconel 792-5A were cyclically strained under total strain control at 23 and 700 °C. Morphology and
volume fraction of γ´ precipitates are different in both materials. Cyclic hardening/softening curves,
cyclic stress-strain curves, and fatigue life curves were obtained at both temperatures. The cyclic
hardening/softening curves depend both on temperature and plastic strain amplitude. The cyclic stressstrain
curves can be fitted by power law. Experimental data of fatigue life curves can be approximated
by the Manson-Coffin and Basquin laws. Dislocation structure was studied in transmission electron
microscope. Planar dislocation arrangements in the form of bands parallel to {111} planes were
identified in both superalloys at both temperatures. Stress-strain response and fatigue life characteristics
are compared at both temperatures and discussed in relation to dislocation arrangement and structural
parameters of the materials studied. |
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ISSN: | 1013-9826 1662-9795 1662-9795 |
DOI: | 10.4028/www.scientific.net/KEM.348-349.101 |