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Assessment of microstructure and mechanical properties of 316LN stainless steel exposed to static sodium at 873 K.

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Title: Assessment of microstructure and mechanical properties of 316LN stainless steel exposed to static sodium at 873 K.
Authors: M, Shanmugavel1,2 (AUTHOR) msv@igcar.gov.in, Das, C.R.1,3 (AUTHOR), Chakraborty, GOPA1,3 (AUTHOR), Mariappan, K.3 (AUTHOR), Kolhatkar, ASHISH3 (AUTHOR), Ramaseshan, R.1,4 (AUTHOR), Prasanti, T.N.3 (AUTHOR), Sudha, C.1,3 (AUTHOR), Chandramouli, S.2 (AUTHOR)
Source: Materials at High Temperatures. Mar2026, Vol. 43 Issue 2, p129-142. 14p.
Subjects: Carburization, Mechanical behavior of materials, Tensile strength, Microstructure, Nanoindentation, Austenitic stainless steel
Abstract: This study aims to investigate the effects of static sodium exposure with carbon concentration of < 10 ppm, and its impact on the microstructure and mechanical properties of 316LN stainless steel for the durations of 3000 to 9000 h at 873 K. The specimen exposed to sodium for 3000 h and 9000 h showed a ferrite layer with a depth of 6–7 µm, and 7–8 µm respectively. XRD and EDS analysis confirmed the presence of a ferrite layer in sodium-exposed specimens. The carburised layer depth estimated by EPMA was 30 µm and 60 µm for 3000 h and 9000 h sodium exposed specimens respectively. Nano-hardness revealed an increase in surface hardness of sodium exposed specimens as compared to thermal aged and as-received specimens. Tensile test results showed an increase in yield and ultimate tensile strength while reduction in ductility as compared to as-received steel. This is attributed to the carburisation phenomenon. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:This study aims to investigate the effects of static sodium exposure with carbon concentration of < 10 ppm, and its impact on the microstructure and mechanical properties of 316LN stainless steel for the durations of 3000 to 9000 h at 873 K. The specimen exposed to sodium for 3000 h and 9000 h showed a ferrite layer with a depth of 6–7 µm, and 7–8 µm respectively. XRD and EDS analysis confirmed the presence of a ferrite layer in sodium-exposed specimens. The carburised layer depth estimated by EPMA was 30 µm and 60 µm for 3000 h and 9000 h sodium exposed specimens respectively. Nano-hardness revealed an increase in surface hardness of sodium exposed specimens as compared to thermal aged and as-received specimens. Tensile test results showed an increase in yield and ultimate tensile strength while reduction in ductility as compared to as-received steel. This is attributed to the carburisation phenomenon. [ABSTRACT FROM AUTHOR]
ISSN:09603409
DOI:10.1080/09603409.2026.2620891