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Dislocation Structures in Nickel Based Superalloy Inconel 792-5A Fatigued at Room Temperature and 700°C

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Abstract:

Dislocations structures were studied using transmission electron microscopy in specimens of cast polycrystalline nickel based superalloy Inconel 792-5A cyclically strained up to failure with constant total strain amplitudes at temperatures 23 and 700 °C. Spatial arrangement of dislocations in individual grains was determined using the technique of oriented foils. Planar dislocation arrangements in the form of bands parallel to the {111} planes were observed in specimens cycled at both temperatures. The bands showed up as thin slabs of high dislocation density cutting both the γ channels and γ´ precipitates. They correspond to areas of cyclic slip localization. Experimental results concerning the dislocation structure are used to discuss the effect of temperature on the cyclic stress-strain response and fatigue life.

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Periodical:

Materials Science Forum (Volumes 567-568)

Pages:

429-432

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.567-568.429

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Online since:

December 2007

Authors:

Martin Petrenec, Karel Obrtlík, Jaroslav Polák, Jiří Man

Keywords:

Dislocation Structure, High-Temperature, Low Cycle Fatigue, Superalloy Inconel 792-5A, TEM

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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