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Metals
Special Issues
Heat Resistant Steels and Alloys
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Heat Resistant Steels and Alloys

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 5066

Special Issue Editors

Prof. Dr. Satoru Kobayashi

E-Mail Website
Guest Editor
Tokyo Institute of Technology, Tokyo, Japan
Interests: microstructural design of heat-resistant steels and alloys; phase equilibria and phase transformations in metals and alloys; high-temperature deformation in metals and alloys.
Dr. Mikael Perrut

E-Mail Website
Guest Editor
DMAS, ONERA, Université Paris-Saclay, 92322 Châtillon, France
Interests: microstructure formation and evolution of Ni-based superalloys; alloy design; phase diagrams determination or calculation; metallurgy of intermetallics (such as titanium aluminides); solidification

Special Issue Information

Dear Colleagues,

Heat-resistant steels and alloys play important roles in high-temperature applications such as fossil fuel-fired power plants, chemical plants, airplane jet engines, etc. Despite the current strong pressure to exclude fossil fuel, especially coal, power generation, it is continuously important to make efforts to improve the heat resistance and long-term properties of the materials for higher efficiency of thermal power generation systems and also to design new materials that are adaptable to new operating conditions such as high-load fluctuation and supercritical carbon dioxide power cycles. The importance of designing new alloys and in understanding degradation mechanisms for improved jet engine operations remains unchanged due to the forecasted increase in the commercial aviation market until 2038.

This Special Issue highlights recent progress and innovations in the fields of heat-resistant steels and alloys from a wide perspective, including alloy design, characterization of microstructure formation and stability, creep deformation and fracture, creep-fatigue interaction, degradation mechanisms, oxidation, and high-temperature corrosion but not excluding other topics. This Special Issue focuses on metallic materials that include creep resistant ferritic and austenitic steels, superalloys, titanium alloys, intermetallic compounds, and refractory metals. Researchers are, therefore, encouraged to submit a research paper on their recent work but also a review paper on the topics.

Prof. Dr. Satoru Kobayashi
Dr. Mikael Perrut
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 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. Metals 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 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

  • Alloy Design
  • Microstructure Formation, Evolution, and Stability
  • Creep Deformation and Fracture
  • Degradation Mechanisms
  • Creep Fatigue Interaction
  • Creep Resistant Ferritic and Austenitic Steels
  • Single Crystalline/Polycrystalline Superalloys for Blade/Disc Applications
  • Advanced Metallic Materials

Published Papers (2 papers)

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Research

13 pages, 15034 KiB  
Article
Effect of Solution Heat Treatment on the Porosity Growth of Nickel-Based P/M Superalloys
by Hengyong Bu, Lu Chen and Yonghua Duan
Metals 2022, 12(11), 1973; https://doi.org/10.3390/met12111973 - 18 Nov 2022
Cited by 4 | Viewed by 1377
Abstract
Thermal-induced porosity (TIP) is one of the major defects in powder metallurgy (P/M) superalloys, and it seriously affects the performance of P/M superalloys. The effects of solution heat treatment on the growth of the TIP of the nickel-based P/M superalloy FGH97 were investigated. [...] Read more.
Thermal-induced porosity (TIP) is one of the major defects in powder metallurgy (P/M) superalloys, and it seriously affects the performance of P/M superalloys. The effects of solution heat treatment on the growth of the TIP of the nickel-based P/M superalloy FGH97 were investigated. A series of solution heat treatment tests were carried out at holding temperatures ranging from 1150 to 1200 °C, with holding times ranging from 0.5 to 8 h. The results showed that the holding time, temperature, and the initial volume of porosity are the primary factors influencing porosity growth, and the volume fraction of TIPs increases by increasing the temperature or extending the holding time. The porosity growth models were constructed based on the porosity statistics combined with a nonlinear fitting method. To evaluate the accuracy of the proposed models, the correlation coefficient (R) and average absolute relative error (AARE) were calculated between the predicted and experimental values. The unbiased AARE values were 2.06% and 3.99% for the average value of TIP and the worst value of TIP, respectively, which imply that the proposed porosity growth models have greater accuracy and can be used to illustrate TIP behavior in solution heat treatment. Full article
(This article belongs to the Special Issue Heat Resistant Steels and Alloys)
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18 pages, 5220 KiB  
Article
Role of Cr Content in Microstructure, Creep, and Oxidation Resistance of Alumina-Forming Austenitic Alloys at 850–900 °C
by Yukinori Yamamoto, Qing-Qiang Ren and Michael P. Brady
Metals 2022, 12(5), 717; https://doi.org/10.3390/met12050717 - 23 Apr 2022
Cited by 9 | Viewed by 1574
Abstract
Creep-rupture properties and oxidation behavior of a series of alumina-forming austenitic (AFA) alloys with variations of Cr contents, based on Fe-(13.5-18)Cr-25Ni-4Al-1.5Nb-0.1C in weight percent, have been evaluated at 850–900 °C. The study investigates material responses in the properties and microstructure through compositional modifications [...] Read more.
Creep-rupture properties and oxidation behavior of a series of alumina-forming austenitic (AFA) alloys with variations of Cr contents, based on Fe-(13.5-18)Cr-25Ni-4Al-1.5Nb-0.1C in weight percent, have been evaluated at 850–900 °C. The study investigates material responses in the properties and microstructure through compositional modifications in AFA alloys, targeting performance optimization of alloys under high-temperature, corrosive industrial environments. The creep-rupture life of the alloys at 850 °C and 30MPa monotonically decreased with increasing Cr content, which was correlated with changes in secondary phase volume fractions, such as the reduction in B2-NiAl + Laves-Fe2Nb and increase in Sigma-FeCr with Cr content. The oxidation test at 900 °C in a water-vapor containing environment revealed a range of Cr content from 13.9 to 15.7 wt.%, enabling the formation of stable, protective external alumina scale as well as preventing internal oxidation/nitridation for up to total 7000 h exposure. On the other hand, the alloys with >16.7 wt.% Cr formed Sigma precipitates, which caused a reduction in not only Cr but also Al in the austenite matrix, resulting in less oxidation resistance than other alloys. The findings will guide the further optimization of material performance in the AFA alloy series. Full article
(This article belongs to the Special Issue Heat Resistant Steels and Alloys)
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