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Wetting by liquid sodium and fracture path analysis of sodium induced embrittlement of 304L stainless steel

Article dans une revue avec comité de lecture
Author
BARKIA, Bassem
1332 Laboratoire de mécanique des sols, structures et matériaux [MSSMat]
24508 Institut de Chimie et des Matériaux Paris-Est [ICMPE]
1167 Laboratoire de Mécanique des Solides [LMS]
AUGER, Thierry
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
COUROUAU, Jean Louis
BOURGON, Julie
24508 Institut de Chimie et des Matériaux Paris-Est [ICMPE]

URI
http://hdl.handle.net/10985/15422
DOI
10.1557/jmr.2017.435
Date
2018
Journal
Journal of Materials Research

Abstract

The wettability of the 304L steel is an important parameter in Liquid Metal Embrittlement studies. Empirically, it is found to be greatly enhanced by pre-exposure to oxygenated liquid sodium. The corrosion interface formed during exposure to sodium has been analyzed at the nanoscale by transmission electron microscopy using the focused ion beam sampling. A thin layer of sodium chromite (Na xCrO2 with x ≤ 1) is detected at the interface validating wetting on an oxide mechanism for the enhanced wetting after pre-exposure. Fracture micromechanisms and the crack path of liquid sodium-embrittled austenitic steel 304L at 573 K have been investigated down to the nanoscale. High-resolution orientation mapping analyses immediately below the fracture surface show that abundant martensitic transformations (γ → α) and twinning occur during deformation of austenite. The preferential crack path is intergranular along the newly formed γ/γ interfaces. It is concluded that these transformations play a major role in the fracture process.

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