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Measurement of Local Mechanical Properties of T91 Steel Corroded by Molten Lead-Bismuth Eutectic Alloy via Micropillar Compression Test

Published online by Cambridge University Press:  10 January 2018

K. Kaede ,
A. Jäger ,
V. Gärtnerová ,
C. Takushima ,
T. Yamamuro  and
S. Tsurekawa
K. Kaede
Affiliation:
Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University, Kumamoto, 860-8555, Japan
A. Jäger
Affiliation:
Department of Mechanics, Faculty of Civil Engineering, Czech Technical University, Prague, Czech Republic
V. Gärtnerová
Affiliation:
Struers GmbH, Scientific and Technological Park, Roztoky, Czech Republic
C. Takushima
Affiliation:
Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University, Kumamoto, 860-8555, Japan
T. Yamamuro
Affiliation:
Technical Division, Faculty of Engineering, Kumamoto University, Kumamoto, 860-8555, Japan
S. Tsurekawa*
Affiliation:
Structural Materials, Division of Materials Science, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto, 860-8555, Japan
*
*Corresponding author: turekawa@kumamoto-u.ac.jp
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Abstract

T91 ferritic/martensitic (F/M) steel is an expected structural material candidate for Gen IV liquid lead-bismuth cooled nuclear reactors. However, molten lead-bismuth eutectic alloy (mLBE) often causes liquid-metal embrittlement (LME) of F/M steels. Although prior austenite grain boundaries and martensite block boundaries were reported to be preferential sites for LME, the mechanism of LME in a T91/LBE couple is yet to be comprehensively understood. In this paper, the effect of mLBE on T91 steel was investigated using micropillar compression tests. mLBE corrosion was found to cause a significant decrease in yield stress. The micropillar made from mLBE-corroded specimen was significantly sheared along high angle boundaries. In addition, EDS analysis demonstrated the presence of Pb/Bi at these high angle boundaries.

Keywords

grain boundariesembrittlementmicrostructure
Type
Articles
Information
MRS Advances , Volume 3 , Issue 8-9: Theory, Characterization and Modeling , 2018 , pp. 419 - 425
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Copyright
Copyright © Materials Research Society 2018 

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References

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