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Crystals
Special Issues
Research on Ni-Based Superalloys
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Research on Ni-Based Superalloys

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (20 October 2023) | Viewed by 1584

Special Issue Editors

Dr. Xiaogang You

E-Mail Website
Guest Editor
Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou 450001, China
Interests: electron beam smelting; superalloys; refractory metals; additive manufacturing; microstructures and mechanical behavior; strengthening mechanism; purification and homogenization; trace impurities and inclusions
Special Issues, Collections and Topics in MDPI journals
Dr. Zhijun Zhang

E-Mail Website
Guest Editor
Department of Materials Engineering, University of British Columbia (UBC), Vancouver, BC, Canada
Interests: aluminum alloys; superalloys; microstructure; heat treatment; mechanical properties
Dr. Pengting Li

E-Mail Website
Guest Editor
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, School of Materials Science and Engineering, Dalian 116024, China
Interests: metallurgy; semiconductor materials; superalloys
Dr. Yali Dong

E-Mail Website
Guest Editor
Testing and Evaluation Center for High-Performance Fibers, Beihang University, Beijing 102206, China
Interests: microstructure characterization; multiscale strain field; micro-digital image correlation (μDIC); crack propagation; thermal barrier coatings (TBCs)

Special Issue Information

Dear Colleagues,

Ni-based superalloys are advanced materials that are widely used in aerospace, power generation, and other high-temperature applications due to their excellent high-temperature performance. Research on Ni-based superalloys has been ongoing for several decades, and significant progress has been made in various areas. As a typical crystalline material, the study of Ni-based superalloys is closely dependent on the development of crystallography and advanced characterization techniques. This Special Issue of Crystals, entitled “Research on Ni-based Superalloys”, aims to provide an international platform for the communication of the latest scientific and engineering theories and experimental studies into Ni-based superalloys worldwide. Research findings in areas including, but not limited to, the following aspects are encouraged for this Special Issue: advanced alloy design, microstructure modification and mechanical performance characterization, advanced processing techniques (powder metallurgy (PM), additive manufacturing (AM), spray forming (SF), and electron beam layer solidification (EBLS)), plastic deformation techniques (forging, rolling, and extrusion), advanced characterization techniques (scanning transmission electron microscopy (STEM), atom probe tomography (APT), electron backscatter diffraction (EBSD), small-angle neutron scattering (SANS), micro-digital image correlation (μDIC), X-ray diffraction (XRD), and in situ testing), advanced coating and surface engineering techniques (thermal barrier coatings (TBCs), environmental barrier coatings (EBCs), and surface treatments), computational modeling and simulation techniques (multi-scale modeling, phase-field method, density functional theory (DFT), molecular dynamics (MD), and finite element analysis (FEA)), environmental effects (hydrogen embrittlement, high-temperature oxidation, and hot  corrosion) etc. The current Special Issue on “Research on Ni-based Superalloys” will become a status report summarizing the progress achieved in recent years.

Dr. Xiaogang You
Dr. Zhijun Zhang
Dr. Pengting Li
Dr. Yali Dong
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. 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 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

  • nickel-based superalloys
  • microstructures and mechanical properties
  • alloy design and microstructure modification
  • processing and manufacturing of superalloys
  • joining and machining
  • microstructure characterization techniques
  • computational modeling and simulation
  • coating and surface engineering
  • oxidation, hot corrosion, and hydrogen embrittlement
  • superalloy smelting and purification
  • superalloy applications and recycling

Published Papers (2 papers)

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Research

13 pages, 23082 KiB  
Article
Effects of Oxygen Content on Microstructure and Creep Property of Powder Metallurgy Superalloy
by Yufeng Liu, Shaorong Zhang, Lichong Zhang, Liang Zheng, Zhou Li, Lin Zhang and Guoqing Zhang
Crystals 2024, 14(4), 358; https://doi.org/10.3390/cryst14040358 - 10 Apr 2024
Viewed by 585
Abstract
The effects of oxygen content on the microstructure and creep properties of the FGH96 superalloy were investigated. When oxygen content increased from 135 ppm to 341 ppm, the prior particle boundary (PPB) rose from degree 2 to degree 3, the size of the [...] Read more.
The effects of oxygen content on the microstructure and creep properties of the FGH96 superalloy were investigated. When oxygen content increased from 135 ppm to 341 ppm, the prior particle boundary (PPB) rose from degree 2 to degree 3, the size of the γ′ phase on PPB enlarged from 1.07 μm to 1.27 μm, and the MC carbide size grew from 77.4 nm to 104.0 nm. Meanwhile, the steady creep rate accelerated from 4.34 × 10−3 h−1 to 1.87 × 10−2 h−1, and the creep rupture life shortened from 176 h to 94 h, the creep rupture mode transferred from intergranular and transgranular mixed fracture to along PPB fracture. During creep, the micro-twin formation and gliding will be restrained by ∑3 boundaries. FGH96 superalloy with higher oxygen content contains less ∑3 boundaries, and its micro-twins cross-slipped instead of single-direction slip in lower oxygen content superalloy. Consequently, samples with a higher oxygen content crept faster and ruptured earlier. Full article
(This article belongs to the Special Issue Research on Ni-Based Superalloys)
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14 pages, 5049 KiB  
Article
Effect of Melt Superheating Treatment on the Microstructures and Purity of a Directionally Solidified Superalloy
by Yi Li, Qifei Zhang, Xiaogang You and Jianbing Qiang
Crystals 2023, 13(12), 1632; https://doi.org/10.3390/cryst13121632 - 25 Nov 2023
Cited by 1 | Viewed by 754
Abstract
In this paper, the effects and the mechanisms of melt superheating treatment (MST) on a directionally solidified alloy were investigated. The mass loss rate of the superalloy becomes severe as the MST temperature rises. The chromium, tantalum, and hafnium are the primary evaporation [...] Read more.
In this paper, the effects and the mechanisms of melt superheating treatment (MST) on a directionally solidified alloy were investigated. The mass loss rate of the superalloy becomes severe as the MST temperature rises. The chromium, tantalum, and hafnium are the primary evaporation elements during MST. As the MST temperature increases from 1500 to 1600 °C, the secondary dendrite arm spacing is reduced by 13.3%, and the average size of γ′ particles are reduced by 11.5% and 18.2% in the dendrite core and inter-dendritic area, respectively. The content of oxygen and nitrogen gradually reduces with the increase in the MST temperature. However, the sulfur content is not significantly affected by the MST temperature. The essential cause of γ′ phases transition is supposed to be the MST-induced changes in solute distribution and the decomposition of atomic clusters. In addition, the nitrides and Ti (N, C)-type carbides are continuously dispersed as the MST temperature increases, which promotes the removal of nitrogen impurities. Full article
(This article belongs to the Special Issue Research on Ni-Based Superalloys)
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