Role of Microstructure on Fracture Behavior of T91 Steel in Presence of Liquid Sodium

Ouadie Hamdane; Jean Bernard Vogt; Ingrid Proriol-Serre

doi:10.4028/www.scientific.net/KEM.592-593.761

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An Effect of the First Non-Singular Term of the Williams Asymptotic Expansion to the Stability of the Bi-Material Orthotropic Notch
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Short Crack Growth Behavior in Ferrite-Bainite Dual Phase Steels
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A Discrete Model for Diffusion-Induced Grain Boundary Deterioration
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Role of Microstructure on Fracture Behavior of T91 Steel in Presence of Liquid Sodium
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Transition from Straight to Fractal Cracks due to Projectile Penetration
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The Effect of Temperature on the Course of Refractory Castables Cracking
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 592-593Role of Microstructure on Fracture Behavior of T91...

Role of Microstructure on Fracture Behavior of T91 Steel in Presence of Liquid Sodium

Abstract:

The sensitivity to liquid sodium embrittlement (LME) of T91 martensitic steel, one of the selected structural materials for future sodium fast reactors has been investigated. The study took into account the role of microstructure. Small punch tests and three points bending tests were carried out in a purified and controlled atmosphere. Precipitation state and dislocations structure resulting from a tempering at 550° C provoked LME of the T91 steel between 200 and 550 °C. Secondary Ions Mass Spectroscopy investigation suggested that sodium penetration at prior austenitic grains boundaries promoted by plastic deformation occurred and caused brittle crack initiation. Brittle cracks propagated in sodium preferentially along martensitic laths-boundaries. J integral calculations confirmed a drop in toughness of T91 tempered at 550°C by liquid sodium up to 80 %.

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Key Engineering Materials (Volumes 592-593)

Pages:

761-764

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.592-593.761

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Online since:

November 2013

Authors:

Ouadie Hamdane, Jean Bernard Vogt, Ingrid Proriol-Serre

Keywords:

Intergranular Fracture, J Integral, Liquid Metal Embrittlement, Martensitic Steel, Secondary Ions Mass Spectrometry SIMS, Small Punch Test , Three-Point Bending Test

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