Liquid-metal-induced fracture mode of martensitic T91 steels

TitleLiquid-metal-induced fracture mode of martensitic T91 steels
Publication TypeJournal Article
Year of Publication2012
AuthorsMartin ML, Auger T, Johnson DD, Robertson IM
Journal TitleJournal of Nuclear Materials
Date Published07
Type of ArticleArticle
ISBN Number0022-3115
Accession NumberWOS:000305719200010
Keywordsalloys, CRACK, EMBRITTLEMENT, gallium, iron, lead-bismuth, lme, mercury

The liquid-metal-induced fracture mode of T91 martensitic steel was investigated by using transmission electron microscopy techniques to characterize the microstructure and crack network in specimens obtained from focused-ion beam machining at and immediately below the fracture surface. Contrary to previous claims of quasi-cleavage fracture, the dominant fracture mode is intergranular cracking at martensite laths and prior austenite grain boundaries. These fracture mode results clarify an outstanding issue in liquid-metal embrittlement of steels that generally occur in a heavily-deformed microstructure. Several cracks were arrested at intergranular carbides, suggesting a metallurgical strategy for impeding liquid-metal-induced crack propagation. (C) 2012 Elsevier B.V. All rights reserved.

URL<Go to ISI>://WOS:000305719200010
Alternate JournalJ. Nucl. Mater.