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Alloys Casting: Materials, Technologies, and Applications
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Alloys Casting: Materials, Technologies, and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: closed (31 March 2020) | Viewed by 12720

Special Issue Editors

Prof. Dr. Annalisa Pola

E-Mail Website1 Website2
Guest Editor
Department of Mechanical and Industrial Engineering, University of Brescia, via Branze 38, 25123 Brescia, Italy
Interests: non-ferrous alloys; foundry processes; metallurgical characterization; mechanical properties; liquid metal treatment; additive manufacturing; semisolid processing; simulation of foundry processes and heat treatments; rheology of liquid and semisolid metals; PDV-CVD coatings
Special Issues, Collections and Topics in MDPI journals
Prof. Marcello Gelfi

E-Mail Website1 Website2
Guest Editor
Department of Mechanical and Industrial Engineering, University of Brescia, via Branze 38, 25123 Brescia, Italy
Interests: metallurgical characterization; foundry processes; mechanical properties; additive manufacturing; semisolid processing; failure analysis; corrosion; PDV-CVD coatings; steelmaking processes; reuse of steelmaking slags
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Foundry processes are now widely applied for the manufacturing of near net shape products for different applications, ranging from structural or mechanical fields, as well as functional applications or those in fashion and the arts. In order to guarantee the obtainment of high-quality cast parts that are able to fulfil the industrial requirements, the alloy has to be properly chosen and treated, and the mold, runners, and gating systems have to be accurately designed. Considering the different aspects involved in the determination of casting performance, this Special Issue aims at disseminating the most recent developments and research in foundry, dealing with both the metal engineering and casting technologies.
Papers on the microstructural and mechanical characterization of castings as well as on the improvement or innovation of alloys and processes are strongly encouraged, especially if compared with conventional ones.
As liquid metal preparation, heat treatments and finishing operations are known to affect the final properties of cast parts, studies exploring these topics are welcome.
Additionally, the Guest Editors of this Special Issue also appreciate papers dealing with the simulation and modelling of foundry processes.

Prof. Annalisa Pola
Prof. Marcello Gelfi
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. Materials is an international peer-reviewed open access semimonthly 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

  • casting quality
  • casting properties
  • filling and solidification
  • foundry processes simulation and modeling
  • liquid metal treatment
  • microstructure 
  • mold design
  • mold materials
  • new casting alloys
  • new casting technologies 
  • post-casting treatments

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Published Papers (4 papers)

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Research

10 pages, 3758 KiB  
Article
The Importance of SiC in the Process of Melting Ductile Iron with a Variable Content of Charge Materials
by Krzysztof Janerka, Łukasz Kostrzewski, Marcin Stawarz and Jan Jezierski
Materials 2020, 13(5), 1231; https://doi.org/10.3390/ma13051231 - 9 Mar 2020
Cited by 5 | Viewed by 3362
Abstract
The article presents issues related to melting ductile iron grade EN-GJS-400-15, with different proportions of feedstock (steel scrap and pig iron). The main attention was paid to determining the impact of silicon carbide on the structure and properties of melted cast iron. In [...] Read more.
The article presents issues related to melting ductile iron grade EN-GJS-400-15, with different proportions of feedstock (steel scrap and pig iron). The main attention was paid to determining the impact of silicon carbide on the structure and properties of melted cast iron. In the conducted melts, carbon and silicon deficiencies were supplemented with a suitably chosen carburizer, ferrosilicon, and SiC metallurgical silicon carbide. The percentage of silicon carbide in the charge ranged from 0 to 0.91%. The basic condition for the planning of melts was to maintain the repeatability of the chemical composition of the output cast iron and cast iron after the secondary treatment of liquid metal with various charge compositions. Based on the tests, calculations, and analyses of the results obtained, it was concluded that the addition of SiC may increase the number and size of graphite precipitates. Increasing the SiC content in the charge also caused a change in the solidification nature of the alloy and the mechanism of growth of spheroidal graphite precipitates, causing their surface to form a scaly shell. The influence of the addition of silicon carbide on the reduction of the temperature of liquidus in the alloys was also observed. Silicon carbide had a positive effect on the structure and properties of melted alloys. The introduction of SiC into the melting in the studied range caused an increase in the content of carbon and silicon without causing an increase in the amount of impurities in the alloy. Full article
(This article belongs to the Special Issue Alloys Casting: Materials, Technologies, and Applications)
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20 pages, 11015 KiB  
Article
The Role of Electric Current-Associated Free Energy and Forced Convection on Grain Refinement in Pure Aluminum under Electropulsing
by Ning Li, Limin Zhang, Rong Zhang, Pengfei Yin, Hongjing Wu, Kaikai Song and Hui Xing
Materials 2019, 12(23), 3846; https://doi.org/10.3390/ma12233846 - 22 Nov 2019
Cited by 4 | Viewed by 2516
Abstract
An experimental study with respect to the effect of an alternating electropulsing on grain refinement in pure aluminum was reported. The macrostructural observation with the mold preheated to different temperature and embedded the metal mesh indicated that the change of electric current-associated free [...] Read more.
An experimental study with respect to the effect of an alternating electropulsing on grain refinement in pure aluminum was reported. The macrostructural observation with the mold preheated to different temperature and embedded the metal mesh indicated that the change of electric current-associated free energy related with the position of crystal nuclei (ΔGem) and forced convection dominated the generation of fine equiaxed grains (FEG). Under electropulsing with 480 A, ΔGem induced the dissociation of crystal nuclei from the upper interface of the electrode and the melt, leading to the generation of FEG. For a larger current intensity, FEG originated from the dissociation of crystal nuclei on the side wall besides the upper interface due to ΔGem and the forced convection. Furthermore, the model coupling the dissociation of crystal nuclei and dendrite fragmentation due to the forced convection and the dissociation of crystal nuclei due to ΔGem was presented to explain the formation mechanism of FEG in pure aluminum under electropulsing. Full article
(This article belongs to the Special Issue Alloys Casting: Materials, Technologies, and Applications)
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13 pages, 6903 KiB  
Article
Investigation of the Quench Sensitivity of an AlSi10Mg Alloy in Permanent Mold and High-Pressure Vacuum Die Castings
by Mengyun Liu, Zhan Zhang, Francis Breton and X.-Grant Chen
Materials 2019, 12(11), 1876; https://doi.org/10.3390/ma12111876 - 11 Jun 2019
Cited by 10 | Viewed by 3504
Abstract
The quench sensitivities of an AlSi10Mg alloy in permanent mold (PM) and high-pressure vacuum die (HPVD) castings were investigated with time–temperature–transformation and time–temperature–property diagrams using an interrupted quench technique. The quench-sensitive temperature range of the HPVD casting sample is 275–450 °C, and its [...] Read more.
The quench sensitivities of an AlSi10Mg alloy in permanent mold (PM) and high-pressure vacuum die (HPVD) castings were investigated with time–temperature–transformation and time–temperature–property diagrams using an interrupted quench technique. The quench-sensitive temperature range of the HPVD casting sample is 275–450 °C, and its nose temperature is 375 °C. The quench-sensitive range of the PM casting sample is 255–430 °C, and the nose temperature is 350 °C. The mechanical strength versus the cooling rate in both casting samples were predicted via a quench factor analysis and verified experimentally. The critical cooling rate of the HPVD casting sample is 20 °C/s whereas it is 17 °C/s for the PM casting sample. With a shorter critical time, higher nose temperature, and higher critical cooling rate, the HPVD casting sample exhibits a higher quench sensitivity than the PM casting sample. The differences in the quench sensitivities of the AlSi10Mg alloy due to the different casting processes is explained via the different precipitation behavior. At the nose temperature, coarse β-Mg2Si precipitates mainly precipitate along the grain boundaries in the HPVD casting sample, whereas rod-like β-Mg2Si precipitates distribute in the aluminum matrix in the PM casting. Full article
(This article belongs to the Special Issue Alloys Casting: Materials, Technologies, and Applications)
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Graphical abstract

10 pages, 12712 KiB  
Article
Using a Three-Dimensional Reduction Method in the High-Efficiency Grain Selector and Corresponding Grain Selection Mechanism
by Xintao Zhu, Fu Wang, Shuaipeng Zhang, Tobias Wittenzellner, Jessica Frieß, Dexin Ma and Andreas Bührig-Polaczek
Materials 2019, 12(11), 1781; https://doi.org/10.3390/ma12111781 - 1 Jun 2019
Cited by 5 | Viewed by 2550
Abstract
In the development of a high-efficiency grain selector, the spiral selectors are widely used in Ni-based single crystal (SX) superalloys casting to produce single crystal turbine blades. For the complex three-dimensional structure of the spiral, a 2D grain selector was designed to investigate [...] Read more.
In the development of a high-efficiency grain selector, the spiral selectors are widely used in Ni-based single crystal (SX) superalloys casting to produce single crystal turbine blades. For the complex three-dimensional structure of the spiral, a 2D grain selector was designed to investigate in this paper. As a result, the parameters of two-dimensional grain selection bond and the corresponding grain selection mechanism were established, and the three-dimensional grain selection bond was designed again by means of two-dimensional coupling optimization parameters. Full article
(This article belongs to the Special Issue Alloys Casting: Materials, Technologies, and Applications)
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