Title :

The effect of Cr content on intragranular κ-carbide precipitation in Fe-Mn-Al-(Cr)-C low-density steels: A multiscale investigation

Author(s) :

Zhang, Jianlei [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Shanghai University
Liu, Yuxiang [Auteur]
Shanghai University
Hu, Conghui [Auteur]
Shanghai University
Jiang, Yueshan [Auteur]
Shanghai University
Addad, Ahmed [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Ji, Gang [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Song, Changjiang [Auteur]
Zhai, Qijie [Auteur]
Zhang, Jianlei [Auteur]

Journal title :

Materials Characterization

Abbreviated title :

Materials Characterization

Volume number :

186

Pages :

111801

Publisher :

Elsevier BV

Publication date :

2022-04

ISSN :

1044-5803

English keyword(s) :

Low-density steel
Cr content
κ-Carbides
Atom probe tomography
Transmission electron microcopy
First-principles calculation

HAL domain(s) :

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

English abstract : [en]

The effect of Cr content on intragranular κ-carbide precipitation behaviors in Fe-Mn-Al-Cr-C low-density steels was investigated by X-ray diffraction (XRD), scanning (SEM) and (high-resolution) scanning transmission electron ...
Show more >The effect of Cr content on intragranular κ-carbide precipitation behaviors in Fe-Mn-Al-Cr-C low-density steels was investigated by X-ray diffraction (XRD), scanning (SEM) and (high-resolution) scanning transmission electron microscopy ((HR)STEM), atom probe tomography (APT), thermodynamic and first-principles calculations. We found that the volume fraction of κ-carbides in near-rapidly solidified samples was decreased with increasing Cr content. The increased Cr content also significantly slowed down the growth rate of κ-carbides during isothermal aging treatment (600 °C/9 h). Thermodynamic calculations showed that the increased Cr content decreased the precipitation temperature of κ-carbides and narrowed the temperature range of κ-carbide formation. The impurity of Cr atoms in κ-carbide structure increased its interfacial energy and elastic strain energy for nucleation, thereby significantly increasing the critical energy for the κ-carbide formation in γ-austenite. Simultaneously, the results of APT and first-principles calculation indicated that the impurity of Cr atoms in the κ-carbide structure preferred to occupy the Al sites, which increased the formation energy of κ-carbides making the κ-carbide formation difficult. In addition, the increased interfacial energy between the κ-carbides and γ-austenite, the improved solubility of Al and C in the γ-austenite and the decreased diffusion coefficient of C in γ-austenite caused by increasing Cr content resulted in a slower growth rate of the κ-carbides.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Métallurgie Physique et Génie des Matériaux

Submission date :

2022-02-18T14:00:40Z
2022-02-24T15:30:22Z