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Metals
Special Issues
Mechanical and Microstructural Characterisations of Nickel Based Superalloys
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Mechanical and Microstructural Characterisations of Nickel Based Superalloys

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (20 July 2019) | Viewed by 17612

Special Issue Editor

Prof. Dr. Soran Birosca

E-Mail Website
Guest Editor
School of Mechanical and Design Engineering, University of Portsmouth, Hampshire, PO1 2ST, UK
Interests: physical metallurgy; deformation mechanism; microstructure characterisation; fracture mechanics and failure mechanism; microtexture and microstructure evolutions during thermomechanical processing and phase transformation of cubic and hcp structures; texture analysis; structure/property relationship; mechanical property of metals; high temperature corrosion; electron microscopy; in-situ observation using SEM; EBSD; neutron and synchrotron X-ray diffraction as well as non-destructive 3D imaging (x-ray micro-tomography)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In this Special Issue of Metals, an open access forum is provided for publishing original papers that investigate the correlations between thermomechanical processing parameters and generated microstructure to understand the physical and mechanical properties of nickel-based superalloys. The following aspects of the science and engineering of nickel-based superalloys are of particular interest:

  • Original research studies that relate to the understanding of mechanical properties of nickel based superalloys obtained following specific processing/heat treatment route (experimental, theoretical, and simulation modeling).
  • Understanding the mechanisms involved in microstructure evolution and phase transformation during processing of nickel based superalloys, specifically as they relate to the understanding of final mechanical properties.
  • Nano/micro/macro structure characterization and chemistry of nickel based superalloys used in power generation, nuclear, aerospace, and other critical applications.
  • Micro/macro texture devolvement during thermo-mechanical processing of nickel based superalloys.

Prof. Dr. Soran Birosca
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

  • Nickel based superalloy
  • Microstructure
  • Deformation
  • Mechanism
  • Microtexture
  • Mechanical Property
  • Fracture Mechanics
  • Texture
  • Material Characterisation
  • Grain Boundary
  • Dislocation
  • Slip System
  • Twinning
  • EBSD

Published Papers (4 papers)

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Research

9 pages, 3830 KiB  
Article
Experimental Investigation on the Deformation Behavior of Inconel 625 Superalloy at High Temperatures
by Gyeong Uk Jeong, Chul Kyu Jin, Hyung Yoon Seo and Chung Gil Kang
Metals 2019, 9(7), 720; https://doi.org/10.3390/met9070720 - 26 Jun 2019
Cited by 5 | Viewed by 4242
Abstract
Inconel 625 alloys are widely applied for high-corrosion resistance and as high-efficiency materials in aeronautical, aerospace, chemical, nuclear, petrochemical, and marine industries. Although Inconel 625 alloys are excellent materials, they cannot be formed at room temperature owing to difficulties in processing. To improve [...] Read more.
Inconel 625 alloys are widely applied for high-corrosion resistance and as high-efficiency materials in aeronautical, aerospace, chemical, nuclear, petrochemical, and marine industries. Although Inconel 625 alloys are excellent materials, they cannot be formed at room temperature owing to difficulties in processing. To improve the formability of Inconel 625, it is necessary to investigate its formability at a high-temperature range and its strain rate variation. In this study, high-temperature deformation behavior after forming was investigated. A high-temperature compression test was performed with a Gleeble 3500 testing machine at various temperatures (approximately 900–1200 °C) and strain rates (10 and 30 s−1) to obtain the high-temperature deformation characteristics of Inconel 625. Furthermore, high-temperature tensile tests were performed to measure elongations and reductions in the area of the Inconel 625 alloy. The tests focused on obtaining the flow stress data and optimal hot forging conditions under various strain rates and temperatures. The results of this research are expected to contribute to hot forming processes and to formability in hot extrusion and pilger processes. Full article
(This article belongs to the Special Issue Mechanical and Microstructural Characterisations of Nickel Based Superalloys)
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20 pages, 38117 KiB  
Article
The Influence of Segregation Bands and Hot Rolling on the Precipitation of Secondary Phases during Aging at 750 °C for Nickel Alloy 625
by Simon Malej, Jožef Medved, Barbara Šetina Batič, Franc Tehovnik, Franci Vode, Jaka Burja and Matjaž Godec
Metals 2019, 9(3), 314; https://doi.org/10.3390/met9030314 - 11 Mar 2019
Cited by 2 | Viewed by 3536
Abstract
For Inconel 625, where the γ” and δ phases precipitate, the influence of prior hot rolling on the process is not well covered. The influence of segregation bands and prior hot rolling on the precipitation of secondary phases during aging at 750 °C [...] Read more.
For Inconel 625, where the γ” and δ phases precipitate, the influence of prior hot rolling on the process is not well covered. The influence of segregation bands and prior hot rolling on the precipitation of secondary phases during aging at 750 °C for different times was investigated. Prior hot-rolling was conducted on a hot rolling mill at 1050 °C and 1150 °C with three different deformation levels. The hot rolled samples were aged at 750 °C for 1, 5, 25 and 125 h. The γ″ precipitated in both the deformed and recrystallized grains in the segregation bands containing a high concentration of niobium and molybdenum and a lower concentration of nickel, chromium and iron. The opposite was observed between the segregation bands where no γ″ precipitate was found. There was a smooth transition in the density and the size of the γ″ particles in the deformed grains at the border of the segregation bands, while a more complex transition occurred in the recrystallized grains. This occurred in the area where the average niobium concentration decreased from 4.5 to 2.7 wt. %, which influenced the mechanical properties. Full article
(This article belongs to the Special Issue Mechanical and Microstructural Characterisations of Nickel Based Superalloys)
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10 pages, 3817 KiB  
Article
Heat Treatments Effects on Nickel-Based Superalloy Inconel 713C
by Breno Boretti Galizoni, Antônio Augusto Couto and Danieli Aparecida Pereira Reis
Metals 2019, 9(1), 47; https://doi.org/10.3390/met9010047 - 07 Jan 2019
Cited by 11 | Viewed by 5189
Abstract
The purpose of this work is to study the effect of heat treatments on the microstructure of the nickel-based superalloy Inconel 713C. Three different conditions were studied and the results compared: (1) as cast; (2) solid solution treatment (1179 °C/2 h) and (3) [...] Read more.
The purpose of this work is to study the effect of heat treatments on the microstructure of the nickel-based superalloy Inconel 713C. Three different conditions were studied and the results compared: (1) as cast; (2) solid solution treatment (1179 °C/2 h) and (3) stabilization heat treatment (1179 °C/2 h plus 926 °C/16 h). Inconel 713C is normally used in the as-cast condition, an improvement in the 980 °C stress-rupture life is often obtained by a solution heat treatment. However, the material in this condition tested under high stress at 730 °C shows a marked decreased in rupture life and ductility. The mechanical resistance in creep increases in Inconel 713C by precipitation hardening phase, with γ’ (Ni3Al) formed during the heat treatments. The characterization techniques used were: chemical analysis, hardness testing, X-ray diffraction, optical microscopy and scanning electron microscopy (SEM), EDS analyzes and thermocalculation. The SEM and EDS analysis illustrated the γ, γ’ and carbides. The matrix phase (γ), has in its constitution the precipitation of the γ’ phase, in a cubic form, and in some regions, carbides were modified through the heat treatments. (M23C6-type) and boride (M3B2 type) identified with the use of the thermocalculation. The heat treatments increase the relative intensity of niobium in the carbides. The hardness test was not achieved because the material was overaged. Full article
(This article belongs to the Special Issue Mechanical and Microstructural Characterisations of Nickel Based Superalloys)
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18 pages, 9186 KiB  
Article
Cold/Hot Deformation Induced Recrystallization of Nickel-Based Superalloys for Molten Salt Reactors
by Martina Koukolikova, Peter Slama, Jaromir Dlouhy, Jan Cerny and Martin Marecek
Metals 2018, 8(7), 477; https://doi.org/10.3390/met8070477 - 22 Jun 2018
Cited by 2 | Viewed by 3582
Abstract
A new special structural nickel-based alloy for use in molten fluoride salt environments in molten salt reactors (MSR) began to be developed by the COMTES FHT Company in the Czech Republic as early as 2001. The outcome of this development was the MoNiCr [...] Read more.
A new special structural nickel-based alloy for use in molten fluoride salt environments in molten salt reactors (MSR) began to be developed by the COMTES FHT Company in the Czech Republic as early as 2001. The outcome of this development was the MoNiCr alloy, an alternative to Hastelloy-N. The present study was carried out on two experimentally-manufactured nickel alloys: MoNiCr and HN80MTY. Its purpose was to activate recrystallization processes in the as-cast microstructure of these alloys. In addition, experiments were performed to find a temperature which produces complete recrystallization. Static and dynamic recrystallization was studied in both alloys as well. An important aspect was to determine the lowest amount of deformation which still ensures complete recrystallization and provides as uniform recrystallized grains as possible. Such microstructure is well-suited for subsequent forming operations. Specimen microstructures were characterized using light microscopy (LM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and electron backscatter diffraction (EBSD). Furthermore, corrosion tests of the MoNiCr alloy were conducted. Full article
(This article belongs to the Special Issue Mechanical and Microstructural Characterisations of Nickel Based Superalloys)
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