Study of LCF Behavior of IN718 Superalloy at Room Temperature

G. Sudarshan Rao; V.M.J. Sharma; K. Thomas Tharian; P. Ramesh Narayanan; K. Sreekumar; Parameshwar Prasad Sinha

doi:10.4028/www.scientific.net/MSF.710.445

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HomeMaterials Science ForumMaterials Science Forum Vol. 710Study of LCF Behavior of IN718 Superalloy at Room...

Study of LCF Behavior of IN718 Superalloy at Room Temperature

Abstract:

nconel 718 is an age hardenable nickel base supper alloy with high strength at elevated temperatures, and excellent creep properties. It is used extensively in turbine discs, blades where components experience elevated temperatures for prolonged duration, leading to coarsening of the microstructure. To evaluate the life of such components after prolonged exposure to service conditions, LCF properties at such large grain sizes are essential. For this purpose, low cycle fatigue (LCF) behavior of forged Inconel 718 turbine rotor disc having large grain size was studied at room temperature. Total strain controlled fatigue tests were conducted in air at ambient temperature on this alloy in solution treated and aged condition. The results indicated that the material exhibits cyclic strain softening and the cyclic yield strength is lower by 40% compared to the monotonic yield strength. The deformation takes place by multiple planar slip.

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Periodical:

Materials Science Forum (Volume 710)

Pages:

445-450

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.710.445

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Online since:

January 2012

Authors:

G. Sudarshan Rao, V.M.J. Sharma, K. Thomas Tharian, P. Ramesh Narayanan, K. Sreekumar, Parameshwar Prasad Sinha

Keywords:

IN718, Low Cycle Fatigue, Planar Slip, Strain Softening

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