Abstract
Nitrogen enhanced 316LN SS is being considered as the candidate structural material for primary side components of sodium cooled fast reactors (SFRs) under future SFR program of India. The structural components of Indian SFR are designed against low cycle fatigue (LCF) as per the French RCC-MR code that provides guidelines for the design and construction of fast reactors. In the present study, LCF design data for nitrogen enhanced 316LN stainless steel (SS) with 0.14 wt.% N are derived from experimental LCF data at temperature 873 K, as per the guidelines of RCC-MR design code. Based on the guidelines, the procedure is outlined for generating design data on cyclic curve, plastic strain concentration factor, Poisson’s ratio correction factor, Neuber’s hyperbola, and strain-life fatigue design curves. Furthermore, the criterion to estimate the allowable design fatigue cycles is also presented. The generated LCF design data on nitrogen enhanced 316LN SS are compared with the codified LCF data on RCC-MR 316LN SS and it must be mentioned that nitrogen enhanced 316LN SS promises better high-temperature resistance to LCF deformation in comparison to the codified 316LN SS (0.06–0.08 wt.% N).
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Acknowledgements
Authors would like to thank Mr. M. Srinivasa Rao, Indira Gandhi Centre for Atomic Research, Kalpakkam for the coordination in conducting the fatigue tests.
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Reddy, G.V.P., Ramana, O.V. Generation of Low Cycle Fatigue Design Data for Nitrogen Enhanced 316LN SS as per RCC-MR Code. Trans Indian Natl. Acad. Eng. 7, 475–481 (2022). https://doi.org/10.1007/s41403-021-00312-0
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DOI: https://doi.org/10.1007/s41403-021-00312-0