Effective and back stress evolution upon cycling oxide-dispersion strengthened steels

Sisodia, S and Jai Sai, N and Lu, K and Knöpfle, F and Zindal, A and Aktaa, J and Chauhan, A (2023) Effective and back stress evolution upon cycling oxide-dispersion strengthened steels. In: International Journal of Fatigue, 169 .

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Abstract

We report on the evolution of effective and back stresses upon cycling a 9Cr oxide-dispersion strengthened (ODS) steel at elevated temperatures by partitioning its hysteresis loops. We found that the trend of the cyclic stress response mainly originates from the back stress evolution, while the effective stress undergoes insignificant change with the cycle number. The effective and back stresses vary with both strain amplitude and temperature but with different magnitudes. These observations are discussed based on the previously reported microstructure evolution. Furthermore, comparison with its similar non-ODS counterpart and other ODS steels pinpoint the origins of their distinct fatigue behaviours. © 2022 Elsevier Ltd

Item Type:	Journal Article
Publication:	International Journal of Fatigue
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Breeding blankets; Chromium alloys; Chromium steel; Low-cycle fatigue, Back stress; Cycle number; Cyclic stress response; Effective stress; Elevated temperature; Low cycle fatigues; Oxide dispersions strengthened steels; Strain amplitude; Strain-temperature; Stress evolution, Dispersions
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	31 Jan 2023 06:56
Last Modified:	31 Jan 2023 06:56
URI:	https://eprints.iisc.ac.in/id/eprint/79611

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