Titre :

Deconstructing the Retained Austenite Stability: In Situ Observations on the Austenite Stability in One- and Two-Phase Bulk Microstructures During Uniaxial Tensile Tests

Auteur(s) :

Kumpati, Joshua [Auteur]
KTH Royal Institute of Technology [Stockholm] [KTH]
Bonvalet Rolland, Manon [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
KTH Royal Institute of Technology [Stockholm] [KTH]
Hasan, Sk. Md. [Auteur]
Indian Institute of Technology Jodhpur [IIT Jodhpur]
KTH Royal Institute of Technology [Stockholm] [KTH]
Shanks, Katherine S. [Auteur]
Cornell University [Ithaca] [CU]
Hedström, Peter [Auteur]
KTH Royal Institute of Technology [Stockholm] [KTH]
Borgenstam, Annika [Auteur]
KTH Royal Institute of Technology [Stockholm] [KTH]

Titre de la revue :

Metallurgical and Materials Transactions A

Nom court de la revue :

Metall Mater Trans A

Éditeur :

Springer Verlag/ASM International

Date de publication :

2024-09-12

ISSN :

1073-5623

Discipline(s) HAL :

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

Résumé en anglais : [en]

Given the critical role that metastable retained austenite (RA) plays in advanced high-strength steel (AHSS), there is significant interest in obtaining a comprehensive understanding of its stability, to achieve excellent ...
Lire la suite >Given the critical role that metastable retained austenite (RA) plays in advanced high-strength steel (AHSS), there is significant interest in obtaining a comprehensive understanding of its stability, to achieve excellent mechanical properties. Despite considerable attention and numerous studies, the significance of individual contributions of various microstructural factors (size, crystallographic orientation, surrounding phases, etc.) on the stability of RA remain unclear, partly due to the difficulty of isolating the direct effects of these factors. In this study, we examined the influence of microstructural factors while minimizing the effect of chemical composition on the mechanical stability of RA. We accomplished this by comparing the austenite (γ) stability in two distinct microstructures: a two-phase RA/martensite microstructure and a one-phase γ microstructure, both with nearly identical γ compositions. We employed in situ high-energy X-ray diffraction during uniaxial tensile testing conducted at both room temperature and 100 °C, facilitating the continuous monitoring of microstructural changes during the deformation process. By establishing a direct correlation between the macroscopic tensile load, phase load partitioning, and the γ/RA transformation, we aimed to understand the significance of the microstructural factors on the mechanical stability of the RA. The results indicate that very fine RA size and the surrounding hard martensitic matrix (aside from contributing to load partitioning) contribute less significantly to RA stability during deformation than expected. The findings of this study emphasize the critical and distinct influence of microstructure on γ/RA stability.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

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 :

2024-09-13T10:33:51Z
2024-09-16T12:32:46Z