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Metals
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Composition Design and Damage Mechanism of Crystal Superalloys
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Composition Design and Damage Mechanism of Crystal 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 (31 August 2024) | Viewed by 3158

Special Issue Editor

Prof. Dr. Nan Wang

E-Mail Website
Guest Editor
School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
Interests: Ni-based single crystal superalloys; laser repair; columnar to equiaxed transition (CET); mechanical properties

Special Issue Information

Dear Colleagues,

Due to their excellent resistance to mechanical and chemical degradation, poly- and single-crystal superalloys are high temperature materials used in gas-turbine engines. The number of alloying elements in these alloys is usually greater than ten, and each element has a specific function for improving properties. Therefore, the composition design, on one hand, is always one critical aspect in developing the promising superalloys, which can perform excellently when serving at elevated temperatures. On the other hand, a long time service under harsh conditions, such as high temperature, high pressure, corrosive environment, and applied stress, could lead to damage in superalloys, which will result in the failure of component. Thus, the damage mechanisms of crystal superalloys is another key aspect.

The composition changes in designing the superalloys could lead to variations in the microstructure characterizations, such as the morphology, element distribution, phase constituents, etc., which will determine the performance and change damage modes of the alloys. Hence, the relationships among “composition design–microstructure characterization–damage mechanism” are interesting for the development of new superalloys with excellent performances.

In this Special Issue, we welcome articles that focus on the composition design and damage mechanism of crystal superalloys. Papers on material preparation methods, alloy and component behaviour, and final products’ performance are also encouraged.

Prof. Dr. Nan Wang
Guest Editor

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

  • superalloys
  • laser cladding
  • laser remelting
  • characterization
  • microstructure
  • CET
  • corrosion
  • creep performance
  • fatigue strength
  • damage

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Published Papers (2 papers)

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Research

26 pages, 16359 KiB  
Article
The 650 °C Tensile Deformation of Graded IN718-René41 Superalloy Fabricated by Laser Blown-Powder Directed Energy Deposition
by Shenyan Huang, Ke An, Chen Shen, Michael Schuster, Ian Spinelli, Marija Drobnjak and Alexander L. Kitt
Metals 2024, 14(8), 950; https://doi.org/10.3390/met14080950 - 21 Aug 2024
Viewed by 677
Abstract
The microstructure and 650 °C tensile properties of a compositionally graded IN718-René41 (718-R41) superalloy fabricated by laser blown-powder directed energy deposition (DED-LB/M) are investigated to understand structure–property relationships and baseline tensile properties. Digital Image Correlation (DIC), in situ neutron diffraction, and conventional characterization [...] Read more.
The microstructure and 650 °C tensile properties of a compositionally graded IN718-René41 (718-R41) superalloy fabricated by laser blown-powder directed energy deposition (DED-LB/M) are investigated to understand structure–property relationships and baseline tensile properties. Digital Image Correlation (DIC), in situ neutron diffraction, and conventional characterization techniques are performed to study the as-built and heat-treated states. The applied heat treatment generates static recrystallization and equiaxed grains in 718-rich compositions, while R41-rich compositions remain partially or un-recrystallized possibly influenced by a higher MC carbide fraction (>0.5%). The yield strengths of the 718 and R41 sections in the heat-treated state are comparable to wrought forms but the graded compositions show weakness due to unoptimized heat treatment. Diffraction elastic constants first decrease and then increase along the 718-R41 composition gradient, while a small difference is observed between the as-built and heat-treated states and γ, γ′ phases. Overall, the compositionally graded region shows a smooth transition in the elastic properties. Grain-level load transfer from the (220) to (200) grains shows compositional dependence, and qualitatively agrees with DIC-measured macroscopic yield strength. Within the (200) grains, the γ/γ′ phases deform elastically until the γ phase yields and afterwards, the γ′ phase takes load from the γ phase. Full article
(This article belongs to the Special Issue Composition Design and Damage Mechanism of Crystal Superalloys)
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15 pages, 5943 KiB  
Article
A Survey on the Oxidation Behavior of a Nickel-Based Alloy Used in Natural Gas Engine Exhaust Valve Seats
by José Henrique Alano, Renato Luiz Siqueira, Claudio Beserra Martins Júnior, Rodrigo Silva, Guilherme dos Santos Vacchi and Carlos Alberto Della Rovere
Metals 2023, 13(1), 49; https://doi.org/10.3390/met13010049 - 24 Dec 2022
Cited by 2 | Viewed by 2196
Abstract
This study reports the oxidation behavior of a Ni-based alloy used in the manufacture of valve seats for automotive engine exhaust systems. Isothermal thermogravimetric analyses were carried out at temperatures of 660, 740, 860, and 900 °C under an oxygen atmosphere for up [...] Read more.
This study reports the oxidation behavior of a Ni-based alloy used in the manufacture of valve seats for automotive engine exhaust systems. Isothermal thermogravimetric analyses were carried out at temperatures of 660, 740, 860, and 900 °C under an oxygen atmosphere for up to 1 h. At 660 and 740 °C, only one stage was observed during the whole time studied. At this stage, the oxide layer was formed mainly by NiO + Cr2O3, following a linear oxidation law with a rate constant (Kl) on the order of magnitude of 10−6 kg/m2s and an apparent activation energy (Ea) of ~47 kJ/mol. At 860 and 900 °C, an identical first stage was observed with a transition to a different stage. In the second stage, the oxidation layer was composed of Cr2O3, and a parabolic oxidation law was followed with a rate constant (Kp) on the order of 10−8 kg2/m4s and Ea of ~128 kJ/mol. Moreover, the Ni-based alloy formed a dense and compact oxide layer after oxidation, with no apparent cavities, pores, or microcracks. Characterization techniques such as Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR), and Raman Spectroscopy were carried out to characterize the formed oxide layer. Full article
(This article belongs to the Special Issue Composition Design and Damage Mechanism of Crystal Superalloys)
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