Influence de traitements thermomécaniques sur les textures, microstructures et propriétés élastiques d'un alliage Fe-40at.%AI à grains fins : procédés d'élaboration & traitements de recristallisation statique

Abstract : This thesis has been carried out to study the thermomechanical treatment effects on textures, microstructures and elastic properties of a fine grain ODS Fe-40at.%Al alloy obtained by consolidation of milled powder. Microstructure has been characterised by SEM and TEM. Textures have been measured by X-Ray Diffraction and by SEM associated with an EBSD system. The texture analysis formation has been completed by simulations using the Taylor model and the anisotropy of elastic properties has been characterised using the Hill model from the measured textures. The effect of several consolidation routes such as extrusion, axial compression and swaging at 1100?C is studied. The best Young modulus is obtained for an extruded bar axially compressed by 50% which has a double <110> and <111> fibre texture. The <110> component results from the extrusion and the <111> component from the axial compression and the partial dynamic recrystallization. The microstructure remains fine due to the action of the oxides particles which limit the dynamic recrystallization. The influence of a static recrystallization treatment is also studied. The critical strain to initiate recrystallization is 8% for 1000?C annealing treatments. The texture and microstructure of the extruded bar are significantly modified after 10% cold axial compression followed by annealing. A recrystallization kinetic study has allowed to notice that the two steps of the recrystallization - primary recrystallization and grain growth - lead to an anisotropy of the microstructure with large grains elongated in the bar axis. This elongated morphology is strongly connected with the oxides particles alignment in the bar axis...
Document type :
Theses
Complete list of metadatas

Cited literature [88 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01750170
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 12:39:56 PM
Last modification on : Monday, April 16, 2018 - 10:42:21 AM

File

Suzon.Eric.SMZ0418.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01750170, version 1

Collections

Citation

Eric Suzon. Influence de traitements thermomécaniques sur les textures, microstructures et propriétés élastiques d'un alliage Fe-40at.%AI à grains fins : procédés d'élaboration & traitements de recristallisation statique. Autre. Université Paul Verlaine - Metz, 2004. Français. ⟨NNT : 2004METZ018S⟩. ⟨tel-01750170⟩

Share

Metrics

Record views

12

Files downloads

12