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Studies on Long-Term Aging of Steel
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Studies on Long-Term Aging of Steel

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: closed (20 April 2022) | Viewed by 3403

Special Issue Editor

Dr. Chungseok Kim

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Chosun University, Gwangju, Republic of Korea
Interests: nonlinear ultrasonic NDT; material damage; material design
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

This is the Special Issue about “Studies on Long-Term Aging of Steel”. Most steels are attractive for mechanical structures in chemical and energy industry components due to their good corrosion resistance, weldability, and mechanical properties at high temperatures. However, these mechanical facilities have been used in severe working conditions such as high temperature, high pressure, and cyclic loading. Structural components designed for severe high temperature and pressure environments at power and chemical plant facilities deteriorate during their operation due to microstructural variations, such as phase transformation, coarsening of secondary phases, generation of intermetallic phases, the recovery of dislocations, and microcrack initiation and propagation. These microstructural variations have led to growing safety and integrity concerns. Additionally, desirable or undesirable unforeseen states may occur during service, which may influence the material state or behavior. Therefore, it is indispensable to understand the mechanism of long-term aging and the microstructural variations of each steel.

Prof. Dr. Chungseok Kim
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • long-term aging
  • steel
  • microstructure
  • mechanical strength
  • degradation

Published Papers (2 papers)

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Research

18 pages, 3991 KiB  
Article
Improving the Efficiency of Electrical Discharge Machining of Special-Purpose Products with Composite Electrode Tools
by Timur Rizovich Ablyaz, Evgeny Sergeevich Shlykov and Karim Ravilevich Muratov
Materials 2021, 14(20), 6105; https://doi.org/10.3390/ma14206105 - 15 Oct 2021
Cited by 6 | Viewed by 1242
Abstract
The article is devoted to increasing the efficiency of electrical discharge machining of special-purpose items with composite electrode tools. The subject of research is the parameter of the roughness of the processed surface and the work of the electro-discharge machining (EDM) of 40Crsteel [...] Read more.
The article is devoted to increasing the efficiency of electrical discharge machining of special-purpose items with composite electrode tools. The subject of research is the parameter of the roughness of the processed surface and the work of the electro-discharge machining (EDM) of 40Crsteel in various modes of electrical discharge machining. The aim of the work is to increase the efficiency of the process of copy-piercing electrical discharge machining of parts introduced into the composition of a special-purpose product and the use of electrode tools with the introduction of 20% graphite. Experimental studies were carried out using the method of a full factorial experiment with a subsequent regression analysis. The experiments were carried out using a copy-piercing Smart CNC EDM machine, a tool electrode, and a profile composite electrode. Empirical dependencies were established, reflecting the relationship between the processing modes, productivity, and surface roughness parameter after processing. A theoretical model for calculating the roughness parameter was developed, which makes it possible to predict the quality of the processed surface with a reliability of 10–15%. To ensure the required ratios of the quality of the processed surface at the maximum performance indicators, technological recommendations were obtained, as a result of which a 35% reduction in machine time was achieved when processing the “screw” part with the required indicators of surface quality. Full article
(This article belongs to the Special Issue Studies on Long-Term Aging of Steel)
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15 pages, 5854 KiB  
Article
Micromagnetic Microstructure- and Stress-Independent Materials Characterization in Reactor Safety Research
by Cyril Zimmer, Yashashwini Nikhitha Rallabandi, Klaus Szielasko, Christian Eichheimer, Michael Luke and Sargon Youssef
Materials 2021, 14(18), 5258; https://doi.org/10.3390/ma14185258 - 13 Sep 2021
Viewed by 1604
Abstract
Reactor safety research aims at the safe operation of nuclear power plants during their service life. In this respect, Fraunhofer IZFP’s micromagnetic multiparameter, microstructure, and stress analysis (3MA) has already made a significant contribution to the understanding of different aging mechanisms of component [...] Read more.
Reactor safety research aims at the safe operation of nuclear power plants during their service life. In this respect, Fraunhofer IZFP’s micromagnetic multiparameter, microstructure, and stress analysis (3MA) has already made a significant contribution to the understanding of different aging mechanisms of component materials and their characterization. The basis of 3MA is the fact that microstructure and mechanical stress determine both the mechanical and magnetic material behavior. The correlation between features of magnetic and mechanical material behavior enables the micromagnetic prediction of mechanical properties and stress, both of which can decisively influence the service life. The Federal Ministry for Economic Affairs and Energy (BMWi) funded this research, handling the mutually superimposed microstructural and stress-dependent influences, a substantial challenge, especially under practical conditions. This superposition leads to ambiguities in the micromagnetic features. The 3MA testing system has been extended by more sophisticated evaluation methods being able to cope with more complex datasets. Investigations dealing with the expansion of the feature extraction and machine learning methods have led to a more precise distinction between microstructural and stress-dependent influences. This approach provides the basis for future applications in reactor safety. Full article
(This article belongs to the Special Issue Studies on Long-Term Aging of Steel)
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