Low-cycle fatigue behavior of austenitic stainless steels with gradient structured surface layer

•LCF behaviors of GSed 316L steels produced by shot peening is investigated.•Hysteresis energy-based model is used for fatigue analyses of GSed 316L steels.•Fatigue damage characteristics of GSed 316L steels are described.•GSed surface layer improves damage defusing ability, thus enhanced fatigue pr...

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Bibliographic Details
Published in:International journal of fatigue 2020-05, Vol.134, p.105481-9, Article 105481
Main Authors: Ho, H.S., Zhou, W.L., Li, Y., Liu, K.K., Zhang, E.
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Cyclic deformation behavior
Damage accumulation
Fatigue failure
Gradient structure
Hardening rate
Heat treating
Hysteresis-energy
Low cycle fatigue
Materials fatigue
Softening
Stainless steel
Surface layers
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Summary:•LCF behaviors of GSed 316L steels produced by shot peening is investigated.•Hysteresis energy-based model is used for fatigue analyses of GSed 316L steels.•Fatigue damage characteristics of GSed 316L steels are described.•GSed surface layer improves damage defusing ability, thus enhanced fatigue property. Low-cycle fatigue behavior of gradient structured (GSed) 316L steels is investigated. The results show that both the homogeneous and gradient structures exhibit first cyclic hardening then cyclic softening. The GSed surface layer can, however, speed up cyclic hardening and extend cyclic softening processes. The analyses using hysteresis energy-based criterion indicates that the former phenomenon can be attributed to the reduced fatigue damage capacity, while the latter to the improved ability of damage defusing. This finding accordingly pinpoints that the retarded fatigue damage accumulation process has been acting as the main contributor to the enhanced fatigue performance of GSed 316L steels.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.105481