Materials and Processes Seminar – Understanding Hydrogen Embrittlement in Materials



Mar 2024

Materials and Processes Seminar – Understanding Hydrogen Embrittlement in Materials

Understanding Hydrogen Embrittlement in Materials: Digital and Experimental Approaches

The Materials and Processes Research Center invites you to participate in a scientific seminar featuring talks from two recognized experts in the field: Dr. Emilio Martinez-Paneda, Associate Professor at Oxford University, and Dr. Abdelali Oudriss, Research Professor at La Rochelle University.

March 28, 2024, at 2pm

IMT Nord Europe
Campus de Douai – Lahure, Amphi GCE
Or via Zoom

Participation is free, but registration is mandatory.
You will receive an email with the Zoom link on March 27.

Problem with registration? Contact us.

Dr. Emilio Martinez-Paneda
Associate Professor at the University of Oxford, UK

Towards a Virtual Hydrogen Lab: computational predictions of hydrogen-assisted fractures

Abstract: Virtual Testing can be a game-changer in the deployment of a hydrogen energy infrastructure, enabling efficient and optimal component design, providing mechanistic predictions of material behaviour and fitness-for-service assessment, and preventing catastrophic failures. However, this highly sought ambition has long remained elusive due to the challenges associated with the complex multi-scale and multi-physics nature of hydrogen embrittlement. This work shows how those challenges can be overcome by improving our understanding of the physical phenomena at play, and by developing robust computational electro-chemo-mechanical schemes that can resolve the underlying physical processes. A comprehensive finite element framework has been developed that can: (i) quantify hydrogen uptake from both gaseous and aqueous electrolyte environments, (ii) simulate the diffusion and trapping of dissolved hydrogen, and (iii) predict the nucleation and growth of cracks, assisted by hydrogen. This has been largely facilitated by the development of two computational technologies: coupled multi-physics models and phase field modelling. Predictions can be obtained for problems of arbitrary complexity (3D, multiple cracks, etc.), at both laboratory and component scale levels. Importantly, these predictions are obtained based purely on physical parameters that can be independently measured. The potential of the framework developed will be demonstrated by addressing two case studies of significant technological interest: (1) quantifying the critical pressure at which hydrogen can be transported in natural gas pipelines without leading to structural integrity issues in welds, and (2) conducting reliable virtual hydrogen-assisted fatigue crack growth experiments for arbitrary choices of loading frequency, material, load ratio, pre-charging condition, and hydrogen pressure.

Abstract: The study of hydrogen embrittlement requires a better understanding of the interactions of hydrogen with different metallurgical heterogeneities. These interactions play a determining role both in hydrogen diffusion and trapping processes, but also in hydrogen-assisted plasticity and damage mechanisms. It is therefore necessary to understand the nature of these interactions, which can occur at different microstructural scales. With this objective, we have conducted numerous experimental and numerical studies on different model and industrial materials such as nickel and its alloys, martensitic and stainless steels, and titanium alloys by adopting original approaches coupling different multiphysics and multiscale processes. These works have provided new elements of understanding of the mechanisms of embrittlement by hydrogen, and have globally highlighted the importance of the mobility of hydrogen and its interactions with point defects in the processes of plasticity and hydrogen-assisted delayed fracture. The objective of this presentation is to summarize the main research work and significant results carried out and obtained to understand the influence of hydrogen –  metallurgical defects interactions on plasticity processes and on the mechanisms of damage induced by hydrogen of different classes of materials and alloys.

Dr. Abdelali OUDRISS
Enseignant-Chercheur – La Rochelle Université, France

About the implication of hydrogen-metallurgical defects interactions in the mechanisms of hydrogen embrittlement of metallic materials 

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