Corossion, Damage Mechanisms, Damge Mechanism, HEDE, HELP, Hydrogen Embrittlement, Hydrogen Enhanced Decohesion (HEDE), Hydrogen-Enhanced Local Plasticity (HELP), Materials, Materials Characterization, Materials Science, Mechanical Properties
Our recent paper in Engineering Failure Analysis Journal:
M.B. Djukic, V. Sijacki Zeravcic, G.M. Bakic, A. Sedmak, B. Rajicic, Hydrogen damage of steels: A case study and hydrogen embrittlement model, Engineering Failure Analysis, 2015, Volume 58, Part 2, pp. 485–498
The simultaneous activity of of the hydrogen-enhanced decohesion (HEDE) and hydrogen-enhanced localized plasticity (HELP) mechanisms of hydrogen embrittlement (HELP+HEDE) was fully confirmed for the first time on steel specimens in situ charged with hydrogen and not only through simulation and modeling. The effects on the mechanical characteristics are also considered.
This paper was published in the special issue of Engineering Failure Analysis on “Recent case studies in Engineering Failure Analysis”, Engineering Failure Analysis, Volume 58, Part 2, December 2015. It has been a tradition for the European Conference on Fracture to select topical papers to be published at three closely related journals, Engineering Fracture Mechanics, Engineering Failure Analysis and International Journal of Fatigue as dedicated special issues after the conference. The European Conference on Fracture belongs to the well-established series of international conferences held under the auspices of European Structural Integrity Society (ESIS). The 20th European Conference on Fracture (ECF20, www.ecf20.no) was successfully held in Trondheim, Norway from the 30th of June to the 4th of July, 2014.
In this special issue we present 15 full length papers on recent case studies in engineering failure analysis, with topics covering fatigue crack propagation, creep deformation, leak-before-break analysis, fracture mechanisms and analysis, defect acceptance criterion, to hydrogen embrittlement models and life extension methodologies. The materials and components studied include magnesium alloys, steels, geological medium, aluminum alloys, welded joints, offshore pipelines and concrete dams. Both numerical simulations and experimental studies can be found in this ECF20 special issue.
Copyright © 2015 Published by Elsevier Ltd.
Many efforts have been made to understand the effects of hydrogen on steels, resulting in an abundance of theoretical models and papers. However, a fully developed and practically applicable predictive physical model still does not exist industrially for predicting and preventing hydrogen damage. In practice, it is observed that different types of damages to industrial boiler components have been associated with the presence and localization of hydrogen in metals. In this paper, a damaged boiler tube made of grade 20 – St.20 (or 20G, equivalent to AISI 1020) was investigated. The experimental research was conducted in two distinctive phases: failure analysis of the boiler evaporator tube sample and subsequent postmortem analysis of the viable hydrogen embrittlement mechanisms (HE) in St.20 steel. Numerous tested samples were cut out from the boiler tubes of fossil fuel power plant, damaged due to high temperature hydrogen attack (HTHA) during service, as a result of the development of hydrogen-induced corrosion process. Samples were prepared for the chemical composition analysis, tube wall thickness measurement, tensile testing, hardness measurement, impact strength testing (on instrumented Charpy machine), analysis of the chemical composition of corrosion products – deposit and the microstructural characterization by optical and scanning electron microscopy – SEM/EDX. The HTHA damage mechanism is a primary cause of boiler tube fracture. Based on the multi-scale special model, applied in subsequent postmortem investigations, the results indicate a simultaneous action of the hydrogen-enhanced decohesion (HEDE) and hydrogen-enhanced localized plasticity (HELP) mechanisms of HE, depending on the local concentration of hydrogen in investigated steel. The model is based on the correlation of mechanical properties to the SEM fractography analysis of fracture surfaces.
Engineering Failure Analysis
Djukic, M.B.; Sijacki Zeravcic, V.; Bakic, G.M.; Sedmak, A.; Rajicic, B.
- • Hydrogen damage of the boiler evaporator tube, made of carbon steel, was investigated.
- • The high temperature hydrogen attack is a primary cause of boiler tube fracture.
- • Postmortem analysis of the hydrogen embrittlement mechanisms was carried out.
- • Experiment is based on the correlation of mechanical properties to SEM fractography.
- • Simultaneous action of the hydrogen embrittlement mechanism, HELP + HEDE, were detected.
Copyright © 2015 Published by Elsevier Ltd.
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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
- 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
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