Abstract
In this study, the influence of cyclic strain amplitude on the evolution of cyclic stress–strain response and the associated cyclic deformation mechanisms in 316LN stainless steel with varying nitrogen content (0.07 to 0.22 wt pct) is reported in the temperature range 773 K to 873 K (500 °C to 600 °C). Two mechanisms, namely dynamic strain aging and secondary cyclic hardening, are found to strongly influence the cyclic stress response. Deformation substructures associated with both the mechanisms showed planar mode of deformation. These mechanisms are observed to be operative over certain combinations of temperature and strain amplitude. For strain amplitudes >0.6 pct, wavy or mixed mode of deformation is noticed to suppress both the mechanisms. Cyclic stress–strain curves revealed both single and dual-slope behavior depending on the test temperature. Increase in nitrogen content is found to increase the tendency toward planar mode of deformation, while increase in strain amplitude leads to transition from planar slip bands to dislocation cell/wall structure formation, irrespective of the nitrogen content in 316LN stainless steel.
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Acknowledgments
The authors would like to thank Mr. P. Shyamala Rao, IGCAR, Kalpakkam for providing SEM facility and Mr. Srinivasa Rao (IGCAR) and Mrs. Kanchanamala, Mr. Papa Rao, IIT Madras for assistance in TEM sample preparation and examination.
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Prasad Reddy, G.V., Sandhya, R., Sankaran, S. et al. Low Cycle Fatigue Behavior of 316LN Stainless Steel Alloyed with Varying Nitrogen Content. Part I: Cyclic Deformation Behavior. Metall Mater Trans A 45, 5044–5056 (2014). https://doi.org/10.1007/s11661-014-2428-5
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DOI: https://doi.org/10.1007/s11661-014-2428-5