Boilers, Corossion, Damage Mechanisms, HEDE, HELP, High Temperature Hydrogen Attack, Hydrogen Embrittlement, Hydrogen Embrittlement Mechanism, Hydrogen-Enhanced Local Plasticity (HELP), Materials, Materials Characterization, Materials Science, Mechanical Properties, Power Plants, Steel
This paper will be presented by Milos B. Djukic at the upcoming 21st European Conference on Fracture – ECF21, Catania, Italy, June 20-24, 2016.
Towards a Unified and Practical Industrial Model for Prediction of Hydrogen Embrittlement and Damage in Steels
By: Milos B. Djukic, Gordana M. Bakic, Vera Sijacki Zeravcic, Bratislav Rajicic, Aleksandar Sedmak, Radivoje Mitrovic and Zarko Miskovic
University of Belgrade, Faculty of Mechanical Engineering, Serbia
Bearing in mind the multiple effects of hydrogen in steels, the specific mechanism of hydrogen embrittlement (HE) is active, depending on the experimental conditions and numerous factors which can be grouped as environmental, mechanical and material influences.
A large number of contemporary studies and models about hydrogen environment assisted cracking (HEAC) and HE in steels are presented in the form of critical review in this paper. This critical review represent the necessary background for the development of multiscale structural integrity model based on correlation between simultaneously active HE micro-mechanisms: the hydrogen-enhanced decohesion (HEDE) and the hydrogen-enhanced localized plasticity (HELP) and macro-mechanical response of material, unevenly enriched with hydrogen during service of boiler tubes in thermal fossil fuel power plants (TPP).
Several different experimental methods and techniques were used to determine the boiler tube failure mechanism and afterwards also the viable HE mechanisms in the investigated structural low carbon steel, grade 20 – St.20 (equivalent to AISI 1020). That represent a background for the development of multiscale structural integrity model based on the correlation of material macro-mechanical properties to SEM fractography analysis of fracture surfaces of Charpy specimens in the presence of simultaneously active HE micro-mechanisms in steel. The aim of this paper is to show how to implement what we have learned from theoretical HE models into the field to provide industry with valuable data and practical structural integrity model that will actually prevent HEAC and hydrogen damage of TPP components and also provide accurate predictions.
All text Copyright © 2016 by Milos Djukic – All Rights Reserved
Our recent article (2015):
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
About model of simultaneous action of hydrogen embrittlement mechanisms (HELP+HEDE) in steel and their effects on Mechanical Properties
The most downloaded articles from Engineering Failure Analysis in the last 90 days.
Our recent article (2016):
Milos B. Djukic, Gordana M. Bakic, Vera Sijacki Zeravcic, Aleksandar Sedmak, and Bratislav Rajicic, Hydrogen Embrittlement of Industrial Components: Prediction, Prevention, and Models. CORROSION. 2016; 72(7): 943-961., http://dx.doi.org/10.5006/1958
A background for the analysis of the viable hydrogen embrittlement mechanisms: hydrogen-enhanced localized plasticity (HELP) and hydrogen-enhanced decohesion (HEDE) in a ferritic-pearlitic carbon steel and development of a model for structural integrity analysis is a literature overview about the current state of the art in hydrogen embrittlement modeling and studies (140 References), presented in this paper.
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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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