Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.9
2.6
Journals
Metals
Special Issues
Characterization and Processing Technology of Superalloys
share announcement

Characterization and Processing Technology of Superalloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (20 August 2024) | Viewed by 7455

Special Issue Editors

Dr. Yongquan Ning

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Interests: Fe-, Ni-, Co-, PM superalloy; net-forming, isothermal-forging, gredient-temperature heat treatment, FE simulation; multi-scale ductile fracture analysis and material characterization; recrystallization on grain boundary, edge and junction; surface nucleation
Prof. Dr. Yanhui Liu

E-Mail Website
Guest Editor
College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
Interests: materials processing; mechanical properties; deformation mechanisms
Dr. Bingchao Xie

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Interests: plastic deformation; recrystallization; nucleation and growth

Special Issue Information

Dear Colleagues,

Superalloys are widely used in aviation, aerospace and energy industries as key high-temperature structural materials with excellent strength, toughness, fatigue, creep and microstructure stability. The hot deformation and subsequent heat treatment processes guarantee the desirable microstructure–properties relationships of superalloy parts and structures. Therefore, an in-depth understanding of microstructural evolution during hot deforming and post-deformation heat treatments of the alloys is a critical theoretical basis for optimizing manufacturing processes, controlling resultant microstructures and tailoring the needed quality and properties of superalloy components. Meanwhile, powder metallurgy and 3D printing technology are also used extensively in fabricating superalloy components, which deserve special attention, and relevant new findings are very welcome.

This Special Issue provides an excellent opportunity for the publication of theoretical and experimental studies related to the characterization and processing technology of superalloys. Any new findings about the topic are welcome, such as the microstructural evolution and characterization during the hot deformation of wrought superalloys and powder metallurgy superalloys, 3D printing and other processing innovations for superalloys, deformation mechanisms, dynamic recrystallization and related underlying mechanisms, etc. More specifically, this Special Issue will cover (but is not limited to) the following fundamental and applied research topics:

  • Fe-, Ni-, Co-based PM superalloys;
  • Forging, rolling, casting and welding;
  • 3D printing and other processing innovations;
  • Microstructural evolution and characterization;
  • Plastic flow behavior and deformation mechanisms;
  • Strain rate and temperature sensitivity;
  • Dynamic recrystallization mechanisms;
  • Boundary in-situ characterization;
  • Previous particle boundary;
  • Grain size and refinement;
  • Secondary precipitate;
  • Texture orientation;
  • Dislocation motion;
  • Fatigue and fracture;
  • High-temperature properties (mechanical properties, structural stability, etc.).

In keeping with the long-standing tradition of publishing the most recent and highest quality work in Special Issues of Metals, this Special Issue features a collection of manuscripts entitled “Characterization and Processing Technology of Superalloys”. This Issue features the finest and latest breaking articles in superalloy development from 2022 and is listed with the main indexing services, making the articles readily searchable, citable and available on the web. Please ensure your paper is submitted on time, and thanks for your interest in this Special Issue.

Prof. Dr. Yongquan Ning
Prof. Dr. Yanhui Liu
Dr. Bingchao Xie
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

  • Fe-, Ni-, Co-based PM superalloys
  • Forging, rolling, casting and welding
  • 3D printing and other processing innovations
  • Microstructural evolution and characterization
  • Plastic flow behavior and deformation mechanisms
  • Strain rate and temperature sensitivity
  • Dynamic recrystallization mechanisms
  • Boundary in-situ characterization
  • Previous particle boundary
  • Grain size and refinement
  • Secondary precipitate
  • Texture orientation
  • Dislocation motion
  • Fatigue and fracture
  • High-temperature properties (mechanical properties, structural stability, etc.).

Benefits of Publishing in a Special Issue

  • Ease of navigation: Grouping papers by topic helps scholars navigate broad scope journals more efficiently.
  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
  • e-Book format: Special Issues with more than 10 articles can be published as dedicated e-books, ensuring wide and rapid dissemination.

Further information on MDPI's Special Issue polices can be found here.

Published Papers (5 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

13 pages, 8237 KiB  
Article
The Effects of Microstructure on the Thermophysical Properties of the K439B Ni-Based Superalloy
by Yidong Wu, Jiemin Gao, Xuanjing Zhang, Jiahui Zheng and Xidong Hui
Metals 2024, 14(9), 1074; https://doi.org/10.3390/met14091074 - 19 Sep 2024
Viewed by 835
Abstract
The thermophysical properties of superalloys are critical for the design, fabrication, and service of hot-end components in engines. In this work, the influence of microstructure on the thermophysical parameters including heat conductivity, thermal diffusivity, heat expansion coefficient, and specific heat capacity of the [...] Read more.
The thermophysical properties of superalloys are critical for the design, fabrication, and service of hot-end components in engines. In this work, the influence of microstructure on the thermophysical parameters including heat conductivity, thermal diffusivity, heat expansion coefficient, and specific heat capacity of the K439B superalloy, which is a prospective cast superalloy for engine casings, were investigated from 100 °C to 900 °C. It has been observed that these properties increase with temperature, especially between 700 °C and 800 °C, for alloys subjected to different heat treatment processes. When compared under the same temperature, these parameters decrease with an increase in the size and volume fraction of the γ′ phase in the alloys. Meanwhile, the interfaces between the γ/γ′ phase and the boundaries between dendrites also impeded the heat treatment. It can be concluded that among the alloys with different heat treatment process, the sequence 1160 °C/4 h + 1080 °C/4 h + 845 °C/20 h exhibited the most stable heat conductivity and lowest heat expansion coefficient, making it advantageous for high-temperature service. Full article
(This article belongs to the Special Issue Characterization and Processing Technology of Superalloys)
►▼ Show Figures

Graphical abstract

19 pages, 13652 KiB  
Article
Research on Microstructural Evolution Behavior of Ni-Based Single-Crystal Alloy with Re Based on Non-Linear Ultrasonic Lamb Wave and Molecular Dynamics Method
by Ben Li, Yilin Zhang, Hongyan Zhou and Xuewu Li
Metals 2024, 14(9), 1016; https://doi.org/10.3390/met14091016 - 5 Sep 2024
Viewed by 733
Abstract
Interface dislocation networks have a great influence on the mechanical properties of the new Ni-based single-crystal alloy (NSC) containing Re, but it is difficult to find out the structural evolution behaviors at the micro-level. Thus, molecular dynamics (MD) simulation is used to analyze [...] Read more.
Interface dislocation networks have a great influence on the mechanical properties of the new Ni-based single-crystal alloy (NSC) containing Re, but it is difficult to find out the structural evolution behaviors at the micro-level. Thus, molecular dynamics (MD) simulation is used to analyze the atomic potential energy change and dislocation evolution mechanism, and non-linear characteristic parameters are used to analyze the microstructure evolution of NSC. First, a new model of Ni-Al-Re that is closer to the real properties of the material is established using the MD method according to the optimal volume ratio of matrix phase to precipitate phase. Then, the MD models of NSC with different contents of Re are calculated and analyzed under compressive and tensile loads. The results show that with an increase in Re atoms, the atomic potential energy at the interface dislocation networks is reduced; thus, the stability of the system is enhanced, and the hindrance of the interface dislocation networks to the dislocation movement of the matrix phase is strengthened. At the same time, the number of HCP structures and OISs formed by the destruction of the intact FCC structures also decreases. In the non-linear ultrasonic experiment, with the increase in Re atoms, the non-linear enhancement of the microstructure of the NSC leads to an increase in the corresponding non-linear characteristic parameters. Accordingly, the microstructural evolution behaviors of the phase interface of the new NSC can be effectively explored using the combination of MD simulation and non-linear ultrasonic experimentation. The results of this study lay a foundation for the subsequent research of the microscopic defects of NSCs by using ultrasonic phased-array technology. Full article
(This article belongs to the Special Issue Characterization and Processing Technology of Superalloys)
►▼ Show Figures

Figure 1

16 pages, 15654 KiB  
Article
Influence of Single- and Double-Aging Treatments on the Mechanical and Corrosion Resistance of Alloy 625
by Barbara Rivolta, Riccardo Gerosa and Davide Panzeri
Metals 2024, 14(7), 823; https://doi.org/10.3390/met14070823 - 17 Jul 2024
Viewed by 962
Abstract
Nickel–chromium–molybdenum Alloy 625 exhibits an excellent combination of mechanical properties and corrosion resistance. However, the high-temperature plastic deformation process and the heat treatment represent critical aspects for the loss in mechanical strength by grain coarsening. This detrimental behavior is worsened by the absence [...] Read more.
Nickel–chromium–molybdenum Alloy 625 exhibits an excellent combination of mechanical properties and corrosion resistance. However, the high-temperature plastic deformation process and the heat treatment represent critical aspects for the loss in mechanical strength by grain coarsening. This detrimental behavior is worsened by the absence of phase transformation temperatures. However, the chemical composition permits slow precipitation-hardening response upon single aging. Therefore, when the soft- or solution-annealed condition is associated with insufficient mechanical properties, this potentiality can be exploited to improve the mechanical strength. Since the γ″ precipitation can be accelerated by double-aging treatment, different time–temperature combinations of double aging at 732 °C and 621 °C are investigated. The simultaneous precipitation of intergranular carbides can dramatically affect the corrosion resistance. Such an undesired phenomenon occurs very quickly at 732 °C, but it is obtained only after very long exposure times at 621 °C. For this reason, a performance chart is developed to compare all the tested conditions. In particular, single aging at 621 °C for 72 h and 130 h are associated with an acceptable combination of mechanical and corrosion properties. Double aging permits a conspicuous acceleration of the aging response. For instance, with double aging at 732 °C 3 h and 621 °C 72 h, it is possible to obtain the same mechanical properties of single aging at 621 °C for 260 h. Such acceleration is accompanied by a more critical corrosion behavior, especially because of the primary step. However, even after its optimization, none of the tested conditions were acceptable. Full article
(This article belongs to the Special Issue Characterization and Processing Technology of Superalloys)
►▼ Show Figures

Figure 1

19 pages, 16099 KiB  
Article
The Effect of Forging and Heat Treatment Variables on Microstructure and Mechanical Properties of a Re-Bearing Powder-Metallurgy Nickel Base Superalloy
by Shamil Mukhtarov, Dmitry Karyagin, Artem Ganeev, Rishat Zainullin, Ruslan Shakhov and Valery Imayev
Metals 2023, 13(6), 1110; https://doi.org/10.3390/met13061110 - 13 Jun 2023
Cited by 2 | Viewed by 1584
Abstract
In our previous works, the effects of forging and heat treatment variables on microstructure evolution and mechanical properties have been studied for an ingot-metallurgy Re-bearing nickel base superalloy. To overcome the issues associated with the production of large-scale ingots and fine-grained workpieces, in [...] Read more.
In our previous works, the effects of forging and heat treatment variables on microstructure evolution and mechanical properties have been studied for an ingot-metallurgy Re-bearing nickel base superalloy. To overcome the issues associated with the production of large-scale ingots and fine-grained workpieces, in the present work, the effect of hot forging and heat treatment variables was studied in a Re-bearing nickel base superalloy prepared via powder metallurgy. The purpose of the study was to reach the properly balanced mechanical properties for the potential use of the superalloy as a disc material. The initial as-HIPed workpieces were subjected to different hot forging and post-forging heat treatment or only to heat treatment (no forging). For the processed workpieces, the recrystallization behavior, size, morphology and volume fraction of γ′ precipitates were evaluated by scanning electron microscopy followed by a study of mechanical properties. The most properly balanced mechanical properties (strength, ductility, creep resistance and creep rupture lifetime) were reached for the γ grain size of dγ ≈ 13.6 µm. A finer and coarser γ grain size (down to dγ ≈ 2.6 and up to dγ ≈ 37.5 µm) even when superimposed with a higher volume fraction of dispersed secondary γ′ precipitates (in the case of dγ = 27–37.5 µm) was associated with worse mechanical properties. Full article
(This article belongs to the Special Issue Characterization and Processing Technology of Superalloys)
►▼ Show Figures

Figure 1

11 pages, 84258 KiB  
Article
Investigation of the Heat Treatment Process and Formation Mechanism of Grain Boundary Serration for GH4795 Superalloy
by Shuo Huang, Wenyun Zhang, Bingchao Xie, Hao Yu, Yongquan Ning and Beijiang Zhang
Metals 2022, 12(9), 1521; https://doi.org/10.3390/met12091521 - 14 Sep 2022
Cited by 4 | Viewed by 2081
Abstract
Heat treatments, including solution treatment and isothermal heat treatment, were conducted to investigate the grain boundary serration of GH4975 superalloy. The two different heat treatment processes could both promote the formation of serrated grain boundaries within the present temperature and soaking time ranges, [...] Read more.
Heat treatments, including solution treatment and isothermal heat treatment, were conducted to investigate the grain boundary serration of GH4975 superalloy. The two different heat treatment processes could both promote the formation of serrated grain boundaries within the present temperature and soaking time ranges, provided that the cooling rates were controlled to be quite slow. The samples subjected to furnace cooling exhibited a more obvious serrated grain boundary morphology by comparison with those subjected to air cooling. The interaction between precipitated phases and grain boundaries was focused to explore the formation mechanisms of serrated grain boundaries within GH4975 superalloy. Heat treatment temperature and soaking time strongly affected the morphology and size of precipitated phases, and consequently influenced the formation of serrated grain boundaries. The directional growth of grain boundary precipitates and its pinning effects on the migration of grain boundaries also affected the grain boundary morphology. Full article
(This article belongs to the Special Issue Characterization and Processing Technology of Superalloys)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-5
Back to TopTop