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Advances in Heat Resistant Alloys (Superalloys)
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Advances in Heat Resistant Alloys (Superalloys)

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: closed (20 March 2023) | Viewed by 3717

Special Issue Editors

Dr. Ahmed Omar Mosleh

E-Mail Website1 Website2 Website3 Website4
Guest Editor
1. Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology (MISIS), Moscow, Russia
2. Department of Mechanical Engineering, Faculty of Engineering at Shoubra, Benha University, Benha, Egypt
Interests: metals; surface modification; microstructure; mechanical properties; materials characterization; metallurgy; additive manufacturing; metal matrix composites; superplastic forming and sheet metal work; wear; corrosion; heat resistant alloys; Titanium alloys; alloy design; heat treatment of metals; metallurgy & metallurgical engineering; materials science
Special Issues, Collections and Topics in MDPI journals
Dr. Ruslan Yu Barkov

E-Mail Website
Guest Editor
Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology (MISIS), Moscow, Russia
Interests: aluminium alloys; materials science; mechanical properties of materials; metallurgy & metallurgical engineering; microscopy; metals; surface modification; microstructure; mechanical properties; materials characterization; metallurgy; additive manufacturing; metal matrix composites; alloy design, heat treatment of metals

Special Issue Information

Dear Colleagues,

At high temperatures, heat-resistant alloys (superalloys) maintain their microstructural stability while also ‎exhibiting excellent creep resistance, high oxidation/corrosion resistance, high strength, and low ‎thermal expansion. Heat-resistant alloys/superalloys are widely employed in gas and steam ‎turbines (disks, combustion chambers, bolts, casings, shafts, exhaust systems, cases, blades, vanes, ‎burner cans, afterburners, thrust reversers), ‎metal processing (hot-work tools and dies, casting dies). In addition, they are used in ‎nuclear power systems, coal gasification and liquefaction systems, heat-treating equipment, chemical ‎process industries, and in other specialized applications requiring heat and/or corrosion resistance. ‎The popular superalloys consist of nickel, iron–nickel, and cobalt alloys. For a materials scientist, one ‎of the most difficult challenges is to develop new materials for use in high-temperature applications. ‎High melting point, excellent oxidation/corrosion resistance, high-temperature performance (high ‎strength), microstructural stability at high temperatures, low density, high stiffness, low cost, reliable ‎performance, and easy to process are the research targets when designing heat-‎resistant alloys (superalloys). The production methods of the superalloy’s component are also ‎an essential consideration when choosing and designing these alloys. ‎

Many research issues still persist despite extensive research and development efforts, such as ‎improving material properties and manufacturing process optimization. In this Special ‎Issue, we aim to publish a wide scope of articles on various aspects of heat-resistant ‎alloys/superalloys. The potential scope of interest includes (but is not limited to):‎

  • Heat-resistant alloys/superalloys design;
  • Ni-based/ Co-based/ Ti- alloys;
  • Al-based heat-resistant alloys;
  • Metal matrix heat-resistant composites;
  • Effect of rare earth elements on heat-resistant alloys;
  • Processing technology (additive manufacturing, casting process, powder metallurgy, forming);
  • High-temperature mechanical properties;
  • Microstructure evaluations of heat resistant/superalloys alloys;
  • Oxidation/corrosion properties;
  • Simulation and modeling.

Dr. Ahmed Mosleh
Dr. Ruslan Yu Barkov
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. 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

  • heat resistant alloys
  • superalloys
  • alloy design
  • ni-based/ co-based alloys
  • advanced metallic materials
  • microstructure evolution
  • creep/creep-fatigue
  • single/Poly-crystalline superalloys
  • high-temperature properties
  • processing and manufacturing technology
  • additive manufacturing
  • simulation and modeling

Published Papers (2 papers)

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Research

27 pages, 49176 KiB  
Article
The Effect of Dopants on Structure Formation and Properties of Cast SHS Alloys Based on Nickel Monoaluminide
by Vitalii V. Sanin, Maksym I. Aheiev, Yury Yu. Kaplanskii, Pavel A. Loginov, Marina Ya. Bychkova and Evgeny A. Levashov
Materials 2023, 16(9), 3299; https://doi.org/10.3390/ma16093299 - 22 Apr 2023
Cited by 1 | Viewed by 1192
Abstract
Alloys based on NiAl-Cr-Co (base) with complex dopants (base+2.5Mo-0.5Re-0.5Ta, base+2.5Mo-1.5Re-1.5Ta, base+2.5Mo-1.5Ta-1.5La-0.5Ru, base+2.5Mo-1.5Re-1.5Ta-0.2Ti, base+2.5Mo-1.5Re-1.5Ta-0.2Zr) were fabricated by centrifugal SHS metallurgy. The phase and impurity compositions, structure, mechanical properties, and the mechanism of high-temperature oxidation at T = 1150 °C were [...] Read more.
Alloys based on NiAl-Cr-Co (base) with complex dopants (base+2.5Mo-0.5Re-0.5Ta, base+2.5Mo-1.5Re-1.5Ta, base+2.5Mo-1.5Ta-1.5La-0.5Ru, base+2.5Mo-1.5Re-1.5Ta-0.2Ti, base+2.5Mo-1.5Re-1.5Ta-0.2Zr) were fabricated by centrifugal SHS metallurgy. The phase and impurity compositions, structure, mechanical properties, and the mechanism of high-temperature oxidation at T = 1150 °C were studied; the kinetic oxidation curves, fitting equations and parabolic rate constant were plotted. Al2O3 and Co2CrO4 were the major phases of the oxidized layer. Three layers were formed: I—the continuous Al2O3 layer with Co2CrO4 inclusions; II—the transitional MeN-Me layer with AlN inclusions; and III—the metal layer with AlN inclusions. The positive effect of thermo-vacuum treatment (TVT) on high-temperature oxidation resistance of the alloy was observed. The total weight gain by the samples after oxidative annealing decreased threefold (from 120 ± 5 g/m2 to 40 ± 5 g/m2). The phases containing Ru and Ti microdopants, which reduced the content of dissolved nitrogen and oxygen in the intermetallic phase to the values ∑O, N = 0.0145 wt.% for the base+2.5Mo-1.5Ta-1.5La-0.5Ru alloy and ∑O,N = 0.0223 wt.% for the base+2.5Mo-1.5Re-1.5Ta-0.2Ti alloy, were identified by transmission electron microscopy (TEM). In addition, with the significant high-temperature oxidation resistance, the latter alloy with Ti had the optimal combination of mechanical properties (σucs = 1644 ± 30 MPa; σys = 1518 ± 25 MPa). Full article
(This article belongs to the Special Issue Advances in Heat Resistant Alloys (Superalloys))
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15 pages, 7959 KiB  
Article
The Effects of Alloying Elements Cr, Al, and Si on Oxidation Behaviors of Ni-Based Superalloys
by Suyu Ma, Qingqing Ding, Xiao Wei, Ze Zhang and Hongbin Bei
Materials 2022, 15(20), 7352; https://doi.org/10.3390/ma15207352 - 20 Oct 2022
Cited by 13 | Viewed by 1832
Abstract
Oxidation behaviors of three Ni-based model alloys and pure Ni in the temperature range of 700–1200 °C are investigated to reveal effects of Cr, Al, and Si on the oxidation resistance of Ni-based superalloys. The formation and integrity of consecutive chromia or alumina [...] Read more.
Oxidation behaviors of three Ni-based model alloys and pure Ni in the temperature range of 700–1200 °C are investigated to reveal effects of Cr, Al, and Si on the oxidation resistance of Ni-based superalloys. The formation and integrity of consecutive chromia or alumina layers are important for excellent oxidation resistance. The addition of 20 at.% Cr can effectively improve the oxidation resistance of Ni-based alloys by forming a thin chromia film below 1000 °C, while adding 15 at.% Al has a beneficial effect on the oxidation resistance of Ni-based alloys at temperatures above 900 °C. The addition of 2 at.% Si to Ni-Al alloy is insufficient to form a protective SiO2 layer but can accelerate the formation of alumina, which enables Ni-Al alloy to form a consecutive inner alumina layer at a relatively low temperature of 800 °C and further improve the oxidation resistance above 800 °C. Full article
(This article belongs to the Special Issue Advances in Heat Resistant Alloys (Superalloys))
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