Mechanical and microstructural stability of P92 steel under uniaxial tension at high temperature - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Materials Science and Engineering: A Année : 2010

Mechanical and microstructural stability of P92 steel under uniaxial tension at high temperature

(1, 2) , (1) , (1) , (1) , (1) , (2)
1
2

Résumé

9–12%Cr creep-resistant ferritic-martensitic steels are candidates for structural components of Generation IV nuclear power plants. However, they are sensitive to softening during low-cycle fatigue, creep and creep-fatigue tests, due to the destabilisation of the tempered martensite microstructure, possibly inducing a decrease in further creep resistance. To better identify the softening mechanisms in P92 steel during uniaxial deformation, tensile tests were carried out at 823 K, showing an extended and stable softening stage on true stress–strain curves after some work-hardening. Three phenomena were studied in order to understand this behaviour: mechanical instability (necking), damage and grain size evolution. Examination of fractured and non-fractured tensile specimens (light optical and electron microscopy, macrohardness) suggested that the physical mechanisms responsible for softening are mainly (sub)grain size evolution and diffuse necking. Models were proposed to predict grain growth and beginning of the mechanical instability during homogeneous deformation.
Fichier non déposé

Dates et versions

hal-00491028 , version 1 (10-06-2010)

Identifiants

Citer

Pierre-François Giroux, F. Dalle, Maxime Sauzay, J. Malaplate, Benjamin Fournier, et al.. Mechanical and microstructural stability of P92 steel under uniaxial tension at high temperature. Materials Science and Engineering: A, 2010, 527, pp.3984-3993. ⟨10.1016/j.msea.2010.03.001⟩. ⟨hal-00491028⟩
125 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More