Tags
Corossion, Damage Mechanisms, Fracture Mechanics, HEDE, HELP, Hydrogen Embrittlement, Hydrogen Embrittlement Mechanism, Hydrogen Enhanced Decohesion (HEDE), Hydrogen-Enhanced Local Plasticity (HELP), Materials, Materials Characterization, Materials Science, Mechanical Properties, Steel
Master Internship on HE in France – contact person Prof. Gilbert Hénaff, Professor of Materials Science, ISAE-ENSMA:
“Hydrogen-embrittlement susceptibility of different grades of stainless steel”
More about Prof. Gilbert Hénaff: https://www.pprime.fr/?q=en/henaff-gilbert
Contact: gilbert.henaff@isae-ensma.fr
More about Pprime Institute (P’): https://www.pprime.fr/?q=en
Pprime Institute (P’) is a research unit affiliated to CNRS (National Center for Scientific Research) created in 2010, in collaboration with ISAE-ENSMA (Ecole Nationale Supérieure de Mécanique et d’Aérotechnique) and the University of Poitiers. It is composed of more than 600 people whose research areas relate to Engineering Sciences and Materials Physics. The Institute is divided into three departments: Physics and Mechanics of Materials; Fluids, Thermal and Combustion, Mechanical Engineering and Complex Systems.
Master Internship:
“Hydrogen-embrittlement susceptibility of different grades of stainless steel”
Original text by Prof. Gilbert Hénaff:
The reduction of emissions is a major challenge for our society, which impacts in particular all activities concerned by mobility. As more particularly regards the automotive industry, the use of a carbon-free energy vector such as hydrogen gas represents a solution that has already been fairly widely deployed in Japan in particular. However, this technological solution raises the question of the compatibility of materials used in different parts of the vehicle vis-à-vis the exposure to high pressures of hydrogen gas. Indeed, it is well known that hydrogen dissolved in a metal can significantly reduce certain mechanical properties: this phenomenon is generally described by the generic term “Hydrogen Embrittlement” (HE). Since the control of the safe operating domain of components exposed to gaseous hydrogen partially conditions the viability of this technological solution, it is therefore essential to improve the understanding of the interactions between the exposure to gaseous hydrogen and the elementary mechanisms of deformation and damage.
The objective of the proposed internship is to study the embrittlement of different grades of stainless steels by gaseous hydrogen, and especially to understand the mechanisms of embrittlement according to the grade considered. A bibliographic study will be necessary, especially on the use in hydrogen of non-austenitic grades, characterized by a lower hydrogen solubility associated with a higher diffusion coefficient. Furthermore, an experimental the tensile behavior of different grades will be characterized on the H2 HYCOMAT test rig for variable exposure conditions (pressure, strain rate, temperature, etc.). The results will first be used to determine embrittlement indices. Beyond this, the analysis of these data, together with a micro-fractographic examination, will aim to define the areas of HE sensitivity and to identify the influencing factors in order to progress in the understanding of the hydrogen-induced damage mechanisms.
Techniques to use:
– Mechanical testing machines;
– Optical microscopy
– Scanning electron microscopy
The internship will be mainly mainly carried out at the Pprime Institute in partnership with UGITECH. However, UGITECH can provide its expertise on metallurgical characterization (micrographs, inclusion analysis, residual martensite measurement, etc.), which will require displacements on the Ugine site.
Contact: gilbert.henaff@isae-ensma.fr
This post is a part of:
The Network of Excellence (NoE) in Hydrogen Embrittlement
The Network of Excellence (NoE) in Hydrogen Embrittlement aims to strengthen scientific and technological excellence by developing an integrated and interdisciplinary scientific approach, and also by addressing the fragmentation of European and Worldwide research in this area.
The Network of Excellence in Hydrogen Embrittlement is structured so that it consists of the following branches:
- Hydrogen Embrittlement Group on LinkedIn
- Hydrogen Embrittlement – Understanding and research framework Project
on ResearchGate - Hydrogen Embrittlement Group on Mendeley
- Hydrogen Embrittlement and Materials Science Blog on WordPress
- Research Topic titled “Hydrogen Embrittlement Mechanisms” (closed now) in collaboration with Frontiers in Materials Journal within Corrosion Research section
- Damage and Fracture Mechanism Group on LinkedIn
The Network of Excellence (NoE) in Hydrogen Embrittlement logo, Copyrights by Milos Djukic all rights reserved © 2013, 2014
Hydrogen Embrittlement & Materials Science by Milos Djukic is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
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