Characterization, Microstructure and Mechanical Properties of Nickel-Based 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: 31 October 2025 | Viewed by 245

Special Issue Editor


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Guest Editor
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, China
Interests: high-temperature alloys; fine control of structure in the preparation process; long-term service stability research; the correlation between preparation technology and structure; material failure analysis; simulation calculation

Special Issue Information

Dear Colleagues,

Ni-based superalloys play a critical role in aeroengines, gas turbines, and petrochemical engineering, ensuring good high-temperature performance and stability. With the development of modern industry, the service temperature and component size of superalloys are increasing. In order to meet the increasing requirements of advanced aerospace engines, superalloys with higher-temperature capabilities are urgently needed. The complexity of manufacturing superalloys is also increasing, including the use of melting, hot deformation, and heat treatment processes. The coordination between the microstructure and properties of superalloys is also important.

This Special Issue aims to address the latest research devoted to the manufacturing process and microstructure control of Ni-based superalloys, especially those used as sustainable materials for aerospace, energy (e.g., nuclear), gas turbines, and other applications.

Dr. He Jiang
Guest Editor

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Keywords

  • superalloy
  • hot deformation
  • heat treatment
  • melta melting
  • hard-to-deform superalloy
  • quality control

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Published Papers (1 paper)

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Research

20 pages, 12225 KiB  
Article
Influence of Hot Deformation Temperature on Grain Size and γ′ Phase in U720Li Alloy After Sub-Solvus Heat Treatment
by Junyi Cheng, Jiangying Xiong, Anping Long, Lei Xiao, Xiangdong Ma, Ganjiang Feng and Jianzheng Guo
Metals 2025, 15(4), 409; https://doi.org/10.3390/met15040409 - 4 Apr 2025
Viewed by 164
Abstract
Precise control of forging and heat treatment parameters is essential to achieve microstructural homogeneity in turbine disks, ensuring optimal mechanical performance for aerospace applications. This study examines the influence of the hot deformation temperatures on the grain size and γ′ phase characteristics of [...] Read more.
Precise control of forging and heat treatment parameters is essential to achieve microstructural homogeneity in turbine disks, ensuring optimal mechanical performance for aerospace applications. This study examines the influence of the hot deformation temperatures on the grain size and γ′ phase characteristics of U720Li alloy following subsequent heat treatments. Samples extracted from a hot-extruded U720Li billet were subjected to isothermal compression within the temperature range of 1100–1130 °C, followed by holding at 1100 °C and 1120 °C for 4 h and air cooling. The results demonstrate that increasing the deformation temperature from 1100 °C to 1120 °C reduces the γ′ phase volume fraction at grain boundaries from 13% to 5%, weakens pinning effects, promotes grain growth during deformation, elevates grain boundary energy, and diminishes stored deformation energy, despite maintaining an equivalent degree of dynamic recrystallization. When the sub-solvus heat treatment temperature was 20 °C below the effective deformation temperature, Ostwald ripening dominated, resulting in a multimodal γ′ phase distribution after cooling. Conversely, when the sub-solvus heat treatment temperature 20 °C exceeded the effective deformation temperature, a significant portion of the intergranular γ′ phase dissolved, leaving a bimodal distribution comprising both large- and small-sized particles. Full article
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