Low Cycle Fatigue Behavior in Austenitic Stainless Steels
Summary
Low cycle fatigue (LCF) in austenitic stainless steels arises when structural components are subjected to high strain amplitudes, often at elevated or cryogenic temperatures, leading to plastic deformation within a relatively low number of cycles. The cyclic stress–strain response typically exhibits initial hardening followed by softening or secondary hardening, reflecting evolving dislocation structures, precipitation interactions and, in some regimes, dynamic strain ageing. Crack initiation predominantly occurs at microstructural heterogeneities such as grain boundaries, precipitate interfaces or weld defects, after which propagation is governed by cyclic slip localisation and sub-grain evolution. High stacking-fault energy in austenite promotes planar slip or cross-slip at different temperature ranges, influencing fatigue life. Environmental factors and thermal cycles further complicate damage mechanisms, making LCF performance a critical design consideration for energy-production, petrochemical and cryogenic applications. Advances in in situ microscopy and diffraction methods have clarified the interplay between dislocation substructures, precipitate distributions and cyclic hardening/softening behaviour, enabling more accurate life prediction and improved alloy design.
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Low Cycle Fatigue Behavior in Austenitic Stainless Steels publication trend
The graph below shows the total number of articles in low cycle fatigue behavior in austenitic stainless steels across all publications each year (not limited to Nature Index journals).
Technical terms
Low-cycle fatigue (LCF): Fatigue regime where high strain amplitudes induce crack initiation and failure in fewer than 10^4 cycles due to significant plastic deformation.
Cyclic hardening/softening: Progressive increase or decrease in stress amplitude under repeated loading, reflecting microstructural rearrangements such as dislocation interactions and precipitate effects.
Dislocation slip: Plastic deformation mechanism involving the motion of dislocations along crystallographic planes under applied stress.
Dynamic strain ageing (DSA): Serrated stress–strain response caused by interactions between diffusing solute atoms and moving dislocations, often enhancing strength but reducing ductility.
References
- Microstructural evolution during high temperature dwell-fatigue of austenitic stainless steels. International Journal of Fatigue (2021).
- Effect of Cryogenic Temperature on Low-Cycle Fatigue Behavior of AISI 304L Welded Joint. Metals (2018).
- Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD. Materials Research (2022).
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