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

Published online by Cambridge University Press:  31 January 2011

Yong Jun Oh ,
Woo Seog Ryu ,
Changmo Sung ,
Il Hiun Kuk  and
Jun Hwa Hong
Yong Jun Oh
Affiliation:
Nuclear Materials Technology Division, Korea Atomic Energy Research Institute, P.O. Box 105, Yusong, Taejon, 305−600, Korea
Woo Seog Ryu
Affiliation:
Nuclear Materials Technology Division, Korea Atomic Energy Research Institute, P.O. Box 105, Yusong, Taejon, 305−600, Korea
Changmo Sung
Affiliation:
Center for Advanced Materials, University of Massachusetts, Lowell, Massachusetts 81854-2881
Il Hiun Kuk
Affiliation:
Center for Advanced Materials, University of Massachusetts, Lowell, Massachusetts 81854-2881
Jun Hwa Hong
Affiliation:
erials Technology Division, Korea Atomic Energy Research Institute, P.O. Box 105, usong, Taejon, 305−600, Korea
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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.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 390 - 397
Copyright
Copyright © Materials Research Society 1999

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