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Type 316l Stainless Steels Exhibiting Five-Fold Symmetry Mo-Rich Phase

Published online by Cambridge University Press:  02 July 2020

Yong-Jun Oh ,
Woo-Seog Ryu ,
Jun-Hwa Hong  and
Il-Hiun Kuk
Yong-Jun Oh
Affiliation:
Advanced Nuclear Materials Development Program Korea Atomic Energy Research Institute P. O. Box 105, Yusung, Taejon, Korea
Woo-Seog Ryu
Affiliation:
Advanced Nuclear Materials Development Program Korea Atomic Energy Research Institute P. O. Box 105, Yusung, Taejon, Korea
Jun-Hwa Hong
Affiliation:
Advanced Nuclear Materials Development Program Korea Atomic Energy Research Institute P. O. Box 105, Yusung, Taejon, Korea
Il-Hiun Kuk
Affiliation:
Advanced Nuclear Materials Development Program Korea Atomic Energy Research Institute P. O. Box 105, Yusung, Taejon, Korea
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Extract

The existence of phases exhibiting five-fold symmetry patterns has recently been reported for conventional heat treated alloys as well as rapidly solidified alloys. The present paper reports initial results on the analysis of a Mo-rich phase in 316L stainless steel which exhibits this symmetry. The formation and growth of this Mo-rich phase were investigated as a function of aging time. In addition, the effect of nitrogen content on the formation of this five-fold phase was also investigated.

The materials investigated were type 316L stainless steels with nitrogen contents of 0.024% and 0.150%. The materials were solution-annealed at 1100 °C for 30 minites followed by an aging treatment at 700 °C for 10–50 hours in a vacuum sealed quartz tube. TEM samples were prepared by conventional twin-jet polishing and carbon replications extracted by use of a bromine-etch.

Irrespective of nitrogen content, the grain boundary phases after 50 hours of aging were totally observed as five different types of precipitates; M23C6 and M6C carbides, intermetallic η and χ phases, and the five-fold symmetry phase.

Type
Phase Transformations in Metals and Alloys
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 685 - 686
Copyright
Copyright © Microscopy Society of America 1997

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References

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