Back-Stress and Its Evolution during Primary Creep in Particle Strengthened Nickel Superalloys

Sarkar, Sanket and Gao, Yan and Huang, Shenyan and Bhattacharya, Saswata and et al, . (2020) Back-Stress and Its Evolution during Primary Creep in Particle Strengthened Nickel Superalloys. Crystals, 10 (4). pp. 1-13. ISSN 2073-4352

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Abstract

According to Eshelby’s theory, inelastically inhomogeneous inclusions in a metallic matrix give rise to a distribution of internal stresses. In the case of particle strengthened materials, such as nickel base superalloys, the presence and evolution of this back-stress leads to various observable effects, such as primary creep, back-flow upon loading, and memory of prior deformation. This article presents the background of the concept of back-stress and how it applies to the scenario of creep. A derivation of an evolution equation for back-stress in the context of primary creep is also presented. The results from neutron diffraction with in-situ creep experiments on directionally solidified nickel superalloys are presented in order to demonstrate the validity of the proposed equation and the corollaries derived therefrom. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

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IITH Creators:

IITH Creators	ORCiD
Bhattacharya, Saswata	UNSPECIFIED

Item Type:

Article

Additional Information:

Acknowledgments: Funding from the Advanced Technology Program of GE Research (Steve Duclos, Bernard Bewlay, Michael Idelchik, Vinod Kumar), GE Aviation and GE Power are gratefully acknowledged. The authors acknowledge helpful discussions with Sanjay Sondhi, Adarsh Shukla and Sachin Nalawade at GE Research, and technical assistance from Ke An at Oak Ridge National Laboratory for neutron diffraction experiment. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Thanks are also due to the anonymous reviewers whose comments greatly improved the quality of the paper.

Uncontrolled Keywords:

Back-stress; Creep; Eshelby inclusion; Neutron diffraction; Superalloys

Subjects:

Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

26 Oct 2022 10:06

Last Modified:

26 Oct 2022 10:06