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Nitrogen redistribution, microstructure, and elastic constant evaluation using ultrasonics in aged 316LN stainless steels

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Abstract

The presence of even dilute concentrations of nitrogen (0.08 mass pct) is found to have a strong influence on the microstructure of a nuclear grade 316LN austenitic stainless steel, thermally aged at 1123 K. High-resolution transmission electron microscopy (TEM) evidence of pre-precipitation reactions involving formation of Cr-N rich clusters prior to Cr2N precipitation has been presented. A tendency for cellular precipitation has been observed on continued aging above 500 hours. Beyond 1000 hours, chi precipitates are the most frequently seen phase. The observed microstructural variations correlate well with ultrasonic velocity and attenuation measurements. The present study reveals that nitrogen in solid solution decreases all the elastic constants, namely longitudinal modulus, elastic modulus, shear modulus, and bulk modulus in this steel but has a negligible effect on Poisson’s ratio. The stages associated with the precipitation of intragranular coherent Cr2N are, however, associated with an increase in all the elastic constants including Poisson’s ratio.

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Authors and Affiliations

  1. Physical Metallurgy Section, the Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India

    P. Shankar (Scientific Officer)

  2. PIE & NDT Development, the Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India

    P. Palanichamy (Scientific Officer)

  3. NDT&E Section, PIE & NDT Development, the Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India

    T. Jayakumar (Head)

  4. Metallurgy and Materials Group, the Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India

    Baldev Raj (Director)

  5. the Centre for Advanced Study, Department of Metallurgy, Indian Institute of Science, 560 012, Bangalore, India

    S. Ranganathan (Professor)

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  1. P. Shankar
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  2. P. Palanichamy
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  3. T. Jayakumar
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  4. Baldev Raj
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  5. S. Ranganathan
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Shankar, P., Palanichamy, P., Jayakumar, T. et al. Nitrogen redistribution, microstructure, and elastic constant evaluation using ultrasonics in aged 316LN stainless steels. Metall Mater Trans A 32, 2959–2968 (2001). https://doi.org/10.1007/s11661-001-0170-2

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  • DOI: https://doi.org/10.1007/s11661-001-0170-2

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