Titre :

Damage and Liquid Metal Embrittlement sensitivity of a CCA alloy in presence of liquid Pb, Bi and Pb-Bi eutectic

Auteur(s) :

Salgado Giampaoli, Jorge [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Bonvalet Rolland, Manon [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Béclin, franck [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Proriol Serre, Ingrid [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207

Titre de la manifestation scientifique :

Structural Materials for Innovative Nuclear Systems (SMINS-7)

Ville :

Madrid

Pays :

France

Date de début de la manifestation scientifique :

2025-03-31

Discipline(s) HAL :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

Résumé en anglais : [en]

In the field of new technologies for energy production, fourth-generation reactors and ADSs are emerging. One of the heat transfer liquids proposed for the LFRs (Lead Fast Reactors) is Pb or the alloy with Bi, called ...
Lire la suite >In the field of new technologies for energy production, fourth-generation reactors and ADSs are emerging. One of the heat transfer liquids proposed for the LFRs (Lead Fast Reactors) is Pb or the alloy with Bi, called Lead-Bismuth Eutectic (LBE). The current problem is the choice of structural materials that will be in contact with these liquid metals (Pb, LBE), due to the occurrence of different phenomena such as Liquid Metal Corrosion (LMC) and Liquid Metal Embrittlement (LME). Various materials have been previously studied. In comparison with Body-Centered Cubic (BCC) steels, Face-centred cubic (FCC) structure materials already studied present the best resistance to LME, but exhibit LMC after prolonged exposure to high temperatures (400°C–550°C), due to the dissolution of elements such as Ni. However, FCC multi-components alloys are known to have high corrosion resistance, and could appear as promising materials to be used in contact with liquid LBE or Pb. This communication provides insights into LME caused by Pb, Bi, or LBE in the FCC complex concentrated alloy (CCA) Fe46Cr15Mn17Ni22 at%. This study was conducted through mechanical testing, microscopic characterisations, and thermodynamic analysis. Tensile tests have been carried out in air and in liquid Pb, Bi, and LBE saturated with oxygen at temperatures between 300°C and 500°C, at different strain rates. After the tests, fracture surfaces and cross-sections of the fractured specimens have been observed using SEM (Scanning Electron Microscopy), EDX-SEM (Energy Dispersive X-ray) and SEM-EBSD (Electron Backscatter Diffraction), to analyse the effects of the liquid metal on the fracture mode, microstructure (phases and composition), and cracking. Thermodynamic analyses using Thermo-Calc to understand the evolution of the material towards equilibrium are studied. The material exhibits ductile behaviour and ductile fracture in air at all tested temperatures. In the presence of liquid Pb, LBE or Bi, sensitivity to LME varies depending on temperature and strain rate. After tensile testing, the material shows surface degradation and damage, especially noticeable when observing the cross-sections. Micrometre-sized particles were observed inside some cracks (400°C–500°C) after the tests in liquid metals; these particles are rich in Fe and Cr, indicating a dissolution of Mn and Ni. Phases equilibrium has been investigated and compared with the experimental results. They suggest phases transformations and microstructural changes that can be connected with the LME mechanisms.Lire moins >

Langue :

Anglais

Comité de lecture :

Non

Audience :

Internationale

Vulgarisation :

Non

Projet Européen :

Innovative Structural Materials for Fission and Fusion

Établissement(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Métallurgie Physique et Génie des Matériaux

Date de dépôt :

2025-04-03T17:51:18Z
2025-04-04T08:15:46Z