Title :

Advanced characterization of cryogenic 9Ni steel using synchrotron radiation, neutron scattering and 57 Fe Mössbauer spectroscopy

Author(s) :

Hany, Sara [Auteur]
Université du Littoral Côte d'Opale [ULCO]
Milochova, Mariana [Auteur]
Université du Littoral Côte d'Opale [ULCO]
Littrell, Ken [Auteur]
Lorange, Robert [Auteur]
Vogt, Jean-Bernard [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Abi-Aad, Edmond [Auteur]
Université du Littoral Côte d'Opale [ULCO]
Bychkov, Eugene [Auteur]
Université du Littoral Côte d'Opale [ULCO]

Journal title :

Materials & Design

Volume number :

146

Pages :

219-227

Publication date :

2018-05-15

HAL domain(s) :

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

English abstract : [en]

The bcc ferritic Fe-Ni steels and in particular the commercial 9Ni alloys were developed and widely used at cryogenic temperatures for liquefied natural gas storage. The excellent thermomechanical properties and cryogenic ...
Show more >The bcc ferritic Fe-Ni steels and in particular the commercial 9Ni alloys were developed and widely used at cryogenic temperatures for liquefied natural gas storage. The excellent thermomechanical properties and cryogenic toughness of these materials are closely related to the presence of metastable fcc austenitic phase whose stability increases in the presence of austenitic components (Ni, Cr, Mn, etc.) and with decreasing fcc grain size. Numerous reports are related to quenching and tempering technological procedures improving the cryogenic performance, however, very little attention has been paid to the structural characterization of austenitic minority species except for a few papers revealing rather contradictory results. Using high-energy X-ray diffraction, small-angle neutron scattering and 57Fe Mössbauer spectroscopy we show that the minority austenitic particles in the commercial X8Ni9 steel are enriched in nickel up to 27 ± 6 at.% Ni and have a characteristic size of 620 ± 25 Å. The austenitic phase is highly sensitive to mechanical deformation and stress. Disappearance of the fcc grains during the treatment implies a mechanical failure while mechanically-resistant regions are characterized by a higher intensity of the austenitic reflections probably related to the generated texture. The last finding was never reported previously.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
ENSCL
CNRS
INRA

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Métallurgie Physique et Génie des Matériaux

Submission date :

2019-05-17T09:15:05Z
2023-11-15T10:41:21Z