Titre :

Effect of Cr on Phase Transformation Behavior of Austenite in Fe-20Mn-9Al-1.2C-xCr Low-Density Steels During Isothermal Aging

Auteur(s) :

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

Titre de la revue :

Metals and Materials International

Nom court de la revue :

Met. Mater. Int.

Numéro :

28

Pagination :

2583-2595

Éditeur :

Springer Science and Business Media LLC

Date de publication :

2022-05-12

ISSN :

1598-9623

Mot(s)-clé(s) en anglais :

Low-density steel
Cr addition
Eutectoid transformation
Isothermal aging

Discipline(s) HAL :

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

Résumé en anglais : [en]

The influence of Cr on the microstructural evolution of austenite in Fe-20Mn-9Al-1.2C-xCr (wt%, x = 0, 3 and 6) low-density steels during isothermal aging at 650 °C for various durations was systematically investigated. ...
Lire la suite >The influence of Cr on the microstructural evolution of austenite in Fe-20Mn-9Al-1.2C-xCr (wt%, x = 0, 3 and 6) low-density steels during isothermal aging at 650 °C for various durations was systematically investigated. With the isothermal aging processed, the 0Cr and 3Cr samples underwent the divorced eutectoid transformation followed by the eutectoid transformation, while only the eutectoid transformation was observed in the 6Cr sample. Meanwhile, increasing Cr content changed the eutectoid transformation products from ferrite + κ-carbide in the 0Cr sample to ferrite + κ-carbide + M23C6 carbide in the 3Cr sample, and to ferrite + M7C3 carbide in the 6Cr sample. The Cr addition significantly increased the A1 temperature (655 °C) of the 0Cr sample to 712 °C of the 3Cr sample, and to 841 °C of the 6Cr sample. As a result, the temperature difference between the A1 temperature and experimental phase transformation temperature (650 °C) was enlarged, which provided a greater driving force for the eutectoid transformation and accelerated the transformation rate of eutectoid transformation. In addition, the Cr addition had a significant effect on the diffusion of constituent elements, decreased the interlayer spacing of pearlite structure from 625 ± 30 nm in the 0Cr sample to 385 ± 25 nm in the 3Cr sample, and to 150 ± 20 nm in the 6Cr sample, refining the eutectoid structure. These findings revealed the mechanism regarding the effect of Cr addition on the eutectoid transformation of austenite, offering valuable insights into the microstructure design of high-performance low-density steels.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

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 :

2022-11-03T00:28:38Z
2022-11-04T09:25:02Z