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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]
Copyright of Materials at High Temperatures is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Assessment of microstructure and mechanical properties of 316LN stainless steel exposed to static sodium at 873 K.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22M%2C+Shanmugavel%22&quot;&gt;M, Shanmugavel&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; msv@igcar.gov.in&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Das%2C+C%2ER%2E%22&quot;&gt;Das, C.R.&lt;/searchLink&gt;&lt;relatesTo&gt;1,3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Chakraborty%2C+GOPA%22&quot;&gt;Chakraborty, GOPA&lt;/searchLink&gt;&lt;relatesTo&gt;1,3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Mariappan%2C+K%2E%22&quot;&gt;Mariappan, K.&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Kolhatkar%2C+ASHISH%22&quot;&gt;Kolhatkar, ASHISH&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Ramaseshan%2C+R%2E%22&quot;&gt;Ramaseshan, R.&lt;/searchLink&gt;&lt;relatesTo&gt;1,4&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Prasanti%2C+T%2EN%2E%22&quot;&gt;Prasanti, T.N.&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Sudha%2C+C%2E%22&quot;&gt;Sudha, C.&lt;/searchLink&gt;&lt;relatesTo&gt;1,3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Chandramouli%2C+S%2E%22&quot;&gt;Chandramouli, S.&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Materials+at+High+Temperatures%22&quot;&gt;Materials at High Temperatures&lt;/searchLink&gt;. Mar2026, Vol. 43 Issue 2, p129-142. 14p.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Carburization%22&quot;&gt;Carburization&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Mechanical+behavior+of+materials%22&quot;&gt;Mechanical behavior of materials&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Tensile+strength%22&quot;&gt;Tensile strength&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Microstructure%22&quot;&gt;Microstructure&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Nanoindentation%22&quot;&gt;Nanoindentation&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Austenitic+stainless+steel%22&quot;&gt;Austenitic stainless steel&lt;/searchLink&gt;
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  Data: This study aims to investigate the effects of static sodium exposure with carbon concentration of &lt; 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 &#181;m, and 7–8 &#181;m 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 &#181;m and 60 &#181;m 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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  Data: &lt;i&gt;Copyright of Materials at High Temperatures is the property of Taylor &amp; Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1080/09603409.2026.2620891
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 129
    Subjects:
      – SubjectFull: Carburization
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Tensile strength
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      – SubjectFull: Microstructure
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      – SubjectFull: Nanoindentation
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      – SubjectFull: Austenitic stainless steel
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              Text: Mar2026
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              Y: 2026
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