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Metals
Special Issues
Advances of Inconel Alloys—Recent Research, Insights, and Challenges
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Advances of Inconel Alloys—Recent Research, Insights, and Challenges

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metallic Functional Materials".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 5237

Special Issue Editors

Dr. Jieshan Hou

E-Mail Website
Guest Editor
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Interests: superalloy; microstructure; mechanical properties
Dr. Shuang Gao

E-Mail Website
Guest Editor
School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Interests: Ni-based superalloy; metal additive manufacturing; microstructure evolution; mechanical property
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Inconel alloys are the first choice for demanding applications in geothermal, nuclear, aerospace, ship building, and chemical processing industries, due to their fatigue strength, acid resistance, excellent resistance, high/low-temperature mechanical properties, and high-temperature oxidation resistance. The scope of the Special Issue on the advances in Inconel alloys includes the latest achievements in research and production, achievements in innovative scientific research, and the solutions of new challenges to Inconel alloys in the development of various fields. Different types of Inconel maintain good mechanical properties at high temperature by using the mechanism of solid solution strengthening or precipitation hardening, which makes the alloy suitable for various harsh environments of high temperature and high pressure. The alloys will form a passivation oxide layer at high temperature, which makes it resistant to corrosion and oxidation. Inconel's chemical composition also guarantees excellent resistance to sodium chloride over a wide temperature range, making it ideal for marine applications or applications requiring continuous exposure to salt and brine. In recent years, the development of new technology has brought the vital force and energy for Inconel alloys, such as additive manufacturing and rapid solidification technology, which has led to the advent of high-performance devices. The organic combination of composition optimization and new processes makes the quality level and service temperature of these superalloys improve continuously.

In this Special Issue, we welcome articles that focus on alloy design, process development, component engineering, lifetime estimation, and material behavior. Research and technology worked to develop the basic understanding of their physical behavior and the more practical aspects required to efficiently maximize the benefits of Inconel alloys.

Dr. Jieshan Hou
Dr. Shuang Gao
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

  • inconel alloy
  • mechanical properties
  • composition optimaztion
  • microstructural characterization
  • long-term aging
  • heat treatment
  • laser aided manufacturing
  • corrosion
  • oxidation

Published Papers (2 papers)

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Research

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13 pages, 4192 KiB  
Article
Microstructure and Microhardness Evolution of Additively Manufactured Cellular Inconel 718 after Heat Treatment with Different Aging Times
by Juan Manuel Salgado-Lopez, Enrique Martinez-Franco, Celso Cruz-Gonzalez, Jorge Corona-Castuera and Jhon Alexander Villada-Villalobos
Metals 2022, 12(12), 2141; https://doi.org/10.3390/met12122141 - 14 Dec 2022
Cited by 1 | Viewed by 1636
Abstract
The manufacture of cellular structures using high-performance materials is possible thanks to the additive manufacturing of metals. However, it is well known that the mechanical and microstructural properties of metals manufactured by this technique do not correspond to those of the same metals [...] Read more.
The manufacture of cellular structures using high-performance materials is possible thanks to the additive manufacturing of metals. However, it is well known that the mechanical and microstructural properties of metals manufactured by this technique do not correspond to those of the same metals manufactured by conventional methods. It is well known that the mechanical properties depend on the direction of manufacture, the size of the pieces, and the type of cell structure used. In addition, the effect of heat treatments on parts manufactured by additive manufacturing differs from parts manufactured by conventional methods. In this work, the microstructure and microhardness of cellular structures of Inconel 718, manufactured by additive manufacturing under heat treatments with different aging times, were evaluated. It was found that the time of the first aging impacts the microhardness and its homogeneity, affecting the microstructure. The highest hardness was obtained for an aging time of 8 h, while the lowest standard deviation was obtained at 10 h. Finally, it is shown that the aging time influences a more homogeneous distribution of the elements and phases. Full article
(This article belongs to the Special Issue Advances of Inconel Alloys—Recent Research, Insights, and Challenges)
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Review

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17 pages, 31185 KiB  
Review
Research Progress of Laser Additive Manufacturing Nickel-Based Alloy Metal Matrix Composites
by Zhiqiang Wang, Shuang Gao, Shuijin Li, Weiguang Zhang, Liang Lan, Yifu Jiang and Bo He
Metals 2023, 13(1), 129; https://doi.org/10.3390/met13010129 - 9 Jan 2023
Cited by 4 | Viewed by 2852
Abstract
Nickel-based alloy metal matrix composite (NAMMC) is a new type of composite material which is expected to replace traditional Nickel-base superalloy used in the manufacture of important hot-end components in aerospace, naval ships and industrial gas turbine engines due to its excellent high [...] Read more.
Nickel-based alloy metal matrix composite (NAMMC) is a new type of composite material which is expected to replace traditional Nickel-base superalloy used in the manufacture of important hot-end components in aerospace, naval ships and industrial gas turbine engines due to its excellent high temperature strength, superior thermal fatigue resistance, high oxidation resistance and thermal corrosion resistance. However, these outstanding properties make it hard to process these materials with conventional manufacturing methods such as forging and machining owing to posing problems of high cost and energy consumptions. Laser additive manufacturing (AM) with a high degree of machining freedom and a high-energy-density laser beam as heat source has been used for processing NAMMC hot-end components with superior performance and complicated structure. Nevertheless, some manufacturing defects of poor bonding, high residual stress, cracking, pore etc. still exist in laser AM NAMMC parts. Therefore, this paper reviews research progress of laser AM NAMMC at present. The control method of manufacturing defect and the effect of reinforcements on the microstructure and mechanical properties of NAMMC are summarized. In addition, the challenges and prospects of laser AM NAMMC in the future are also discussed. Full article
(This article belongs to the Special Issue Advances of Inconel Alloys—Recent Research, Insights, and Challenges)
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