LIANG, Monsieur DISEN (2019) PFE - Project Graduation, ENSTA.

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Abstract

This internship focuses on InterGranular Stress Corrosion Cracking (IGSCC) of irradiated austenitic stainless steels and the possibility to develop a stress-based criterion for cracks initiation. On one hand, a 3D realistic microstructure model of an ion-irradiated tensile sample exhibiting stress corrosion cracks is constructed by combining serial sectioning and Electron BackScatter Diffraction (EBSD) technique. A methodology is developed to correct image distortion coming from large-scale EBSD maps. A two-steps alignment algorithm based on correlating distortion-free SEM images and EBSD maps, and minimizing the difference between two consecutive sections is proposed. On the other hand, a crystal plasticity constitutive model is applied on the constructed 3D model and numerical simulations are then performed by using the Fast Fourier Transform (FFT) based software AMITEX_FFTP. Intergranular normal stresses are computed based on the results of the simulations and the evaluation of grain boundary normals from the reconstructed microstructure. The comparison between the computed intergranular normal stresses and cracks distribution obtained experimentally gives some insight of the possibility towards a stress-based criterion for cracks initiation.

Item Type:Thesis (PFE - Project Graduation)
Uncontrolled Keywords:IGSCC, 3D EBSD, FFT, crystal plasticity constitutive laws, cracks initiation
Subjects:Materials Science, Mechanics and Mechanical Engineering
ID Code:7606
Deposited By:Disen Liang
Deposited On:09 mars 2020 15:01
Dernière modification:09 mars 2020 15:01

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