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
Volume426
Pages71-77
Date Published07
Type of ArticleArticle
ISBN Number0022-3115
Accession NumberWOS:000305719200010
Keywordsalloys, CRACK, EMBRITTLEMENT, gallium, iron, lead-bismuth, lme, mercury
Abstract

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
DOI10.1016/j.jnucmat.2012.03.040
Alternate JournalJ. Nucl. Mater.