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Metals
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Thin Wall Iron Castings
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Thin Wall Iron Castings

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 December 2021) | Viewed by 8445

Special Issue Editor

Prof. Dr. Marcin Górny

E-Mail Website
Guest Editor
Faculty of Foundry Engineering, AGH University of Science and Technology, Władysława Reymonta 23, 30-059 Krakow, Poland
Interests: thermal analysis; solidification; aluminum alloys; cast iron
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The excellent property combinations of thin-wall ductile iron castings, including thin-wall austempered ductile iron (TWADI) and alloyed thin-wall ductile iron (e.g., high-silicon ductile iron and high-nickel ductile iron), have opened new possibilities for ductile iron to replace steel and aluminum castings in many engineering applications, with considerable cost benefits. High-performance thin-walled ductile and gray iron castings are widely used for exhaust manifolds, rocker arms, pump bodies, control arms, steering knuckles, mounts and brackets, disc brakes, flywheel and pressure plates of the clutch cover, pump bodies, and cylinder blocks, and so forth. Thin wall iron castings are therefore considered as a potential material for lightweight components with good mechanical and utility properties at relatively low cost. The most important challenges for thin wall iron castings, which solidify at high cooling rates, are structure and properties stability, tendency toward carbides, and defect formations and high dimensional tolerances.

The Special Issue “Thin Wall Iron Castings” aims to collect articles connected with shaping the structure and properties of thin-walled iron castings. It focuses, in particular, on the nucleation and growth processes during casting solidification (including numerical modeling) and the modification, inoculation, science, and engineering of high-quality Si–Mo, ADI, IDI, etc. thin-walled ductile iron castings.

Prof. Marcin Górny
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

  • Thin sections
  • Primary austenite grain
  • Graphite eutectic
  • Phase transformation
  • Modeling
  • Ductile iron
  • Modification and inoculation
  • Austempered ductile iron
  • Mechanical properties

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Published Papers (2 papers)

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Research

15 pages, 5652 KiB  
Article
Influence of Cooling Rate on Microstructure Formation of Si–Mo Ductile Iron Castings
by Marcin Górny, Magdalena Kawalec, Beata Gracz and Mirosław Tupaj
Metals 2021, 11(10), 1634; https://doi.org/10.3390/met11101634 - 14 Oct 2021
Cited by 20 | Viewed by 3256
Abstract
The present study highlights the effect of the cooling rate on the microstructure formation of Si–Mo ductile iron. In this study, experiments were carried out for castings with different wall thicknesses (i.e., 3, 5, 13, and 25 mm) to achieve various cooling rates. [...] Read more.
The present study highlights the effect of the cooling rate on the microstructure formation of Si–Mo ductile iron. In this study, experiments were carried out for castings with different wall thicknesses (i.e., 3, 5, 13, and 25 mm) to achieve various cooling rates. The simulation of the cooling and solidification was performed through MAGMASOFT to correlate the cooling conditions with the microstructure. The phase diagram of the investigated alloy was calculated using Thermo-Calc, whereas the quantitative metallography analyses using scanning electron microscopy and optical microscopy were performed to describe the graphite nodules and metallic matrix morphologies. The present study provides insights into the effect of the cooling rate on the graphite nodule count, nodularity, and volumetric fractions of graphite and ferrite as well as the average ferritic grain size of thin-walled and reference Si–Mo ductile iron castings. The study shows that the cooling rates of castings vary within a wide range (27 °C–1.5 °C/s) when considering wall thicknesses of 3 to 25 mm. The results also suggest that the occurrence of pearlite and carbides are related to segregations during solidification rather than to cooling rates at the eutectoid temperature. Finally, the present study shows that the longitudinal ultrasonic wave velocity is in linear dependence with the number of graphite nodules of EN-GJS-SiMo45-6 ductile iron. Full article
(This article belongs to the Special Issue Thin Wall Iron Castings)
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15 pages, 9966 KiB  
Article
Effects of Inoculation on Structure Characteristics of High Silicon Ductile Cast Irons in Thin Wall Castings
by Iulian Riposan, Eduard Stefan, Stelian Stan, Nicoleta Roxana Pana and Mihai Chisamera
Metals 2020, 10(8), 1091; https://doi.org/10.3390/met10081091 - 12 Aug 2020
Cited by 12 | Viewed by 4177
Abstract
Previous experiments pointed out that the deviation using a sphere as reference of graphite particles is noticeably increased by Si-alloying, with inoculation as a possible beneficial effect. The main objective of the present work is to evaluate the effects of commercial inoculants (Ca/Ca, [...] Read more.
Previous experiments pointed out that the deviation using a sphere as reference of graphite particles is noticeably increased by Si-alloying, with inoculation as a possible beneficial effect. The main objective of the present work is to evaluate the effects of commercial inoculants (Ca/Ca, Ba/Ca, RE-FeSi alloys) on 4.5%Si ductile iron, thin wall castings. FeSiMgRE treated iron (0.032–0.036%Mgres) is in-mold inoculated (a four-work-positions pattern). A complex chemical composition is obtained for each inoculation variant. Wedge casting W3 (ASTM A 367) is used to evaluate structure characteristics at different wall thickness (3–15 mm). Minimum and maximum size, area, nodule count, and representative graphite shape factors are evaluated. Roundness (including AG and Fmax) at 0.6–0.8 level illustrates the common formation of slightly irregular spheroidal graphite (Type V, ISO 945). Ca, RE-FeSi inoculation leads to the highest level of real perimeter and, consequently, to the lowest level of Sphericity. Ca, Ba-FeSi inoculation appears to be better than simple Ca-FeSi for improving graphite parameters, while Ca, RE-FeSi has the lowest beneficial effect, especially as it negatively affects the compactness degree of graphite particles. A two-step liquid treatment using RE-bearing FeSiCaMg master alloy and Ca, Ba-FeSi inoculant appears to be a solution to improve graphite parameters for high-Si ductile irons solidified in thin wall castings. Full article
(This article belongs to the Special Issue Thin Wall Iron Castings)
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