Precipitation kinetics and mechanical behavior in a solution treated and aged dual phase stainless steel

Type : Publication
Auteur(s) :  Riad BADJI, Nabil KHERROUBA, Brahim MEHDI, Bilal CHENITI, M. BOUABDALLAH, C. KAHLOUN, B. BACROIX
Année :  2014
Domaine : Physique
Revue : Materials Chemistry and Physics
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF :  (.pdf)
Mots clés :  alloys, aging, microstructure, mechanical properties

Résumé : 

The precipitation kinetics and the mechanical behaviour in a solution treated and aged dual phase stainless steel (DSS) are investigated. X-Ray diffraction, transmission and scanning electron microscopy techniques are used to characterize the microstructure and to identify its constituents. The precipitation kinetics analysis shows that the ferrite to σ phase transformation follows the modified Johnson Mehl Avrami (JMA) model containing an impingement parameter c that is adjusted to 0.3. Activation energies calculation leads to conclude that interface reaction is the main mechanism that controls the σ phase formation. Detailed analysis of the extent of the different tensile deformation domains reveals the significant contribution of both σ phase particles and dislocation accumulation to the strain hardening of the material