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Grain boundary filmlike Fe–Mo–Cr phase in nitrogen-added type 316L stainless steels

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Abstract

The precipitates in nitrogen-added type 316L stainless steels (SS) were investigated by transmission electron microscopy (TEM) after thermal aging. Besides carbides (M23C6 and M6C) and intermetallic phases, an unknown phase of an Fe–Mo–Cr(–Si) system n a filmlike morphology precipitated at grain boundaries. In spite of the similarity in ts chemical composition to that of the Laves phase, the phase of the Fe–Mo–Cr(–Si) system exhibited five-, three-, and twofold symmetries, which are generally observed in quasicrystals having icosahedral symmetry. This phase was formed from the intergrowth of small crystalline clusters of the Laves phase. Decreasing the nitrogen content to that of commercial type 316L grade suppressed the formation of the filmlike fivefold phase. This was attributed to the dissipation of small Laves clusters by M23C6 carbides, which increased as a result of the decreased nitrogen content.

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Authors and Affiliations

  1. Nuclear Materials Technology Division, Korea Atomic Energy Research Institute, P.O. Box 105, 305−600, Yusong, Taejon, Korea

    Yong Jun Oh, Woo Seog Ryu, Il Hiun Kuk & Jun Hwa Hong

  2. Center for Advanced Materials, University of Massachusetts, 81854-2881, Lowell, Massachusetts, USA

    Changmo Sung

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  1. Yong Jun Oh
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  2. Woo Seog Ryu
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  3. Changmo Sung
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  4. Il Hiun Kuk
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  5. Jun Hwa Hong
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Oh, Y.J., Ryu, W.S., Sung, C. et al. Grain boundary filmlike Fe–Mo–Cr phase in nitrogen-added type 316L stainless steels. Journal of Materials Research 14, 390–397 (1999). https://doi.org/10.1557/JMR.1999.0057

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  • DOI: https://doi.org/10.1557/JMR.1999.0057

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