Special Issue "Nanostructured Ferritic Alloys"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: 4 November 2018

Special Issue Editors

Guest Editor
Dr. Stuart A. Maloy

Los Alamos National Laboratory, Los Alamos, United States
Website | E-Mail
Interests: mechanical testing; irradiation effects; advanced characterization; alloy development; radiation tolerant materials; joining; nuclear reactors
Guest Editor
Dr. David T. Hoelzer

Oak Ridge National Laboratory, Oak Ridge, United States
Website | E-Mail
Interests: alloy development; irradiation effects; microstructure analysis; mechanical properties and deformation; joining; mechanical alloying

Special Issue Information

Dear Colleagues,

Nanostructured ferritic alloys (NFA) emerged near the beginning of the 21st century, with much excitement in nuclear energy research communities around the globe as a hopeful solution for achieving high performance combined with tolerance to degradation of mechanical properties upon exposure to elevated temperatures and high neutron doses that are envisioned in future advanced nuclear reactor technologies. NFAs evolved from oxide dispersion strengthened (ODS) alloys, which have been around for many decades, due to refinement in the microstructure consisting of an ultra-fine grain structure and high concentration of nano-size (~2–5 nm) oxide particles. Recent studies have shown that NFAs possess remarkable high-temperature strength, resulting in outstanding creep performance combined with very low swelling rates as revealed in high-dose heavy-ion irradiation experiments. NFAs are traditionally produced using mechanically alloying iron-based alloy powders with a dispersoid powder, such as yttria-Y2O3, followed by a consolidation method to produce solid products. Unfortunately, this manufacturing method presents many challenges that still require better understanding via research and development. One area that needs greater understanding involves processing conditions and composition influences that affect the uniformity in grain size, as well as the dispersion of nano-size oxide particles that greatly impact the performance and the production reproducibility of NFAs. The successful development of NFAs will require novel ideas and greater understanding of fabrication and joining technologies that historically have hindered the acceptance of ODS alloys for high performance applications in the past. The fabrication of NFAs into complex products, such a fuel cladding, presents challenges due to the high strength properties that do not favor plastic deformation and another problematic area are advanced joining methods that do not degrade the salient microstructure features of NFAs. Therefore, the development of NFAs offering enormous potential in demanding applications of advanced nuclear reactors along with the significant challenges in processing, fabrication and joining technologies is a matter of intensive research interest and a hot topic.

In this Special Issue, we welcome original research and review articles covering the state of the art and the latest research results covering “Nanostructured Ferritic Alloys” that aim to provide improved understanding of key processing parameters for achieving the important microstructural traits that are linked to higher levels of performance and understanding of deformation and radiation effects in harsh environments of advanced nuclear reactors operating at high temperatures to high neutron doses.

The first round submission deadline: 15 May 2018

Dr. Stuart A. Maloy
Dr. David T. Hoelzer
Guest Editors

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 papers will be 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. Crystals is an international peer-reviewed open access monthly 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 1200 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

  • Nanostructured ferritic alloys
  • Irradiation
  • Tensile properties
  • Processing
  • Fracture toughness
  • Welding

Published Papers (1 paper)

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Research

Open AccessArticle Why Do Secondary Cracks Preferentially Form in Hot-Rolled ODS Steels in Comparison with Hot-Extruded ODS Steels?
Crystals 2018, 8(8), 306; https://doi.org/10.3390/cryst8080306
Received: 6 July 2018 / Revised: 20 July 2018 / Accepted: 23 July 2018 / Published: 25 July 2018
PDF Full-text (21094 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Secondary cracks are known to absorb energy, retard primary crack propagation and initiate at lower loads than primary cracks. They are observed more often in hot-rolled than in hot-extruded ODS steels. In this work, the microstructural factors responsible for this observation are investigated.
[...] Read more.
Secondary cracks are known to absorb energy, retard primary crack propagation and initiate at lower loads than primary cracks. They are observed more often in hot-rolled than in hot-extruded ODS steels. In this work, the microstructural factors responsible for this observation are investigated. Better understanding of these factors can lead to tailoring of improved ODS steels. Fracture toughness testing of two batches of 13Cr ODS steel, one hot-rolled and the other hot-extruded, was carried out. The fracture behaviour of secondary cracks was investigated using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). Crystallographic texture and grain morphology play a predominant role in preventing secondary cracks in hot-extruded ODS steels. At lower temperatures, secondary cracks occur predominantly via transgranular cleavage. The fracture mode changes to ductile and intergranular at higher temperatures. Full article
(This article belongs to the Special Issue Nanostructured Ferritic Alloys)
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