Fatigue Behavior of Nanostructured Austenitic Stainless Steels
Summary
Austenitic stainless steels are widely used in critical applications due to their excellent corrosion resistance and ductility. Introducing nanostructured zones—via severe plastic deformation, surface mechanical treatments or cryogenic machining—yields grain sizes in the nanometre regime, which markedly enhance strength and delay crack initiation. Gradient nanostructures, where a nanocrystalline surface layer transitions to a coarse-grained core, combine high surface hardness with overall toughness. Under cyclic loading, these architectures suppress microstructural softening, reduce surface roughening and activate multiple toughening mechanisms such as fatigue crack deflection, phase transformation hardening and arrest of crack propagation at interphase boundaries. The interplay between deformation-induced martensitic transformation and stacking-fault formation further improves fatigue life, especially in very high cycle fatigue regimes. Understanding residual stress distributions, cyclic strain localisation and subsurface stability is key to optimising component life in sectors from biomedical implants to energy and aerospace components.
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Fatigue Behavior of Nanostructured Austenitic Stainless Steels publication trend
The graph below shows the total number of articles in fatigue behavior of nanostructured austenitic stainless steels across all publications each year (not limited to Nature Index journals).
Technical terms
Nanostructured: A material state characterised by grain sizes below 100 nm, leading to high hardness and strength via grain-boundary strengthening.
Austenitic stainless steel: A face-centred cubic (FCC) iron-chromium-nickel alloy known for excellent corrosion resistance and formability.
Gradient nanostructure: A deliberate variation in microstructure from a nanocrystalline surface to a coarser interior, combining surface strength with core toughness.
Martensitic transformation: A diffusionless phase change from γ-austenite to α′-martensite induced by deformation or cooling, increasing hardness and altering fatigue response.
Very high cycle fatigue (VHCF): The fatigue regime beyond 10^7 load cycles, where non-surface-initiated cracks and internal defects become critical.
Surface mechanical attrition treatment (SMAT): A technique involving high-energy impacts on a surface to induce severe plastic deformation and nanocrystallisation.
References
- Controllable Martensite Transformation and Strain-Controlled Fatigue Behavior of a Gradient Nanostructured Austenite Stainless Steel. Nanomaterials (2021).
- Influence of surface morphology on the very high cycle fatigue behavior of metastable and stable austenitic Cr-Ni steels. MATEC Web of Conferences (2018).
- Generation of deformation-induced martensite when cryogenic turning various batches of the metastable austenitic steel AISI 347. Production Engineering (2019).
- Literature Review on the Fatigue Properties of Materials Processed by Surface Mechanical Attrition Treatment (SMAT). Metals (2022).
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