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Electron microscopic study of cr2n formation in thermally aged 316ln austenitic stainless steels

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Abstract

The formation of dichromium nitride phase in low nitrogen austenitic stainless steels has been studied by transmission electron microscopy (TEM). The electron diffraction patterns unambiguously confirm the formation of Cr2N phase on aging these steels in the range of 1023 to 1123 K, for time durations up to 100 hours. It is found that while no perceptible microstructural features could be recognized, formation of dislocation pairs is an important characteristic that could be associated with the nitrogen ordering in the matrix. The precipitation sequence processes have been discussed on the basis of stress-induced interactions that are predominant in interstitial alloys. Further, certain aspects of me-chanical behavior are explained on the basis of our study.

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Authors and Affiliations

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

    D. Sundararaman (Leader, Special Materials Group), P. Shankar (Scientific Officer) & V. S. Raghunathan (Head)

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  1. D. Sundararaman
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  2. P. Shankar
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  3. V. S. Raghunathan
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Sundararaman, D., Shankar, P. & Raghunathan, V.S. Electron microscopic study of cr2n formation in thermally aged 316ln austenitic stainless steels. Metall Mater Trans A 27, 1175–1186 (1996). https://doi.org/10.1007/BF02649856

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