A novel rate based methodology for creep fatigue life estimation of superalloys

Barat, Kaustav and Sivaprasad, S and Kar, Sujoy Kumar and Tarafder, S (2020) A novel rate based methodology for creep fatigue life estimation of superalloys. International Journal of Pressure Vessels and Piping, 182 (IF-2.230). p. 104064.

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In this present work, we present an accumulated inelastic strain rate based methodology to predict creep fatigue life of two different superalloys i.e. Haynes 282 and IN 718. The evolution of differential strain rate during creep and fatigue respectively motivated the present work. As creep is the rate controlling damage process in creep fatigue interaction, present mean strain rate based approach considers creep strain rate as a kinetic variable controlling the process. The other variable considered for this approach is accumulative cyclic strain during Creep-fatigue interaction. Our prediction method is purely based upon a relative accumulation rate of creep and fatigue strain. This method correlates the creep fatigue life with rate of interaction in strain-controlled regions successfully from the data of creep fatigue tests on those superalloys at two temperatures, 650 °C and 760 °C. We found suitable microstructure sensitive constants in a lifing model.

Item Type:Article
Official URL/DOI:https://www.sciencedirect.com/science/article/abs/...
Uncontrolled Keywords:Creep-fatigue interaction; Life estimation; Relative rate of interaction; Strain accumulation; Cumulative inelastic strain
Divisions:Material Science and Technology
ID Code:8082
Deposited By:Sahu A K
Deposited On:04 Feb 2020 11:05
Last Modified:05 Aug 2020 13:07
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