Modélisation isotherme et anisotherme de la limite d'élasticité précipitation-dépendante de l'Inconel 718

Abstract : This thesis manuscript presents the results of work concerning the effects of thermal transients on the precipitation of intermetallic phases in the nickel-based superalloy Inconel 718® and the consequences of this precipitation on the mechanical properties of this alloy. This work focuses on a coupled approach capable of describing the evolution of the precipitation of the γ'' phase and its consequences on the yield strength of the Inconel 718®. The precipitation state is modeled thanks to the implementation of the equations of the classical germination and growth theory, modified to take into account the platelet geometry of the γ'' precipitates. This precipitation model is then validated by experimental data from the literature but also from transmission electron microscope observations and small angle neutron scattering tests. The size distribution of the γ'' phase thus simulated is used as the input data of a model for predicting the precipitation-dependent elasticity limit. These simulated elasticity limits are finally compared with experimental results from tensile tests. A welding model was then made to test the elastic yield prediction model for thermal transients in an industrial case.
Document type :
Theses
Complete list of metadatas

Cited literature [143 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02191442
Contributor : Abes Star <>
Submitted on : Tuesday, July 23, 2019 - 2:49:12 PM
Last modification on : Tuesday, August 20, 2019 - 3:52:17 PM

File

these.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02191442, version 1

Citation

Alexandre Balan. Modélisation isotherme et anisotherme de la limite d'élasticité précipitation-dépendante de l'Inconel 718. Matériaux. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSEI003⟩. ⟨tel-02191442⟩

Share

Metrics

Record views

21

Files downloads

14