Measurement of Local Mechanical Properties of T91 Steel Corroded by Molten Lead-Bismuth Eutectic Alloy via Micropillar Compression Test. (10th January 2018)

• Record Type: Journal Article
• Authors: Kaede, K.; Jäger, A.; Gärtnerová, V.; Takushima, C.; Yamamuro, T.; Tsurekawa, S.
• Is Part Of: MRS advances. Volume 3:Number 8/9(2018)
• Page Start: 419
• Page End: 425
• Publication Date: 2018-01-10
• Subjects: grain boundaries, -- embrittlement, -- microstructure; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/adv.2018.36
• Languages: English
• ISSNs: 2059-8521

Abstract

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.