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2. History of Metallurgy

Author

Ripoşan, Iulian, Stan, Stelian, Ceccarelli, Marco, Series Editor, Cuadrado Iglesias, Juan Ignacio, Advisory Editor, Koetsier, Teun, Advisory Editor, Moon, Francis C., Advisory Editor, Oliveira, Agamenon R.E., Advisory Editor, Zhang, Baichun, Advisory Editor, Yan, Hong-Sen, Advisory Editor, and Banabic, Dorel, editor

Published
2024
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36. Solidification Characteristics of Silicon-Alloyed Ductile Cast Irons.

Author

Stan, Stelian, Riposan, Iulian, Chisamera, Mihai, and Stan, Iuliana

Subjects
NODULAR iron, SOLIDIFICATION, CAST-iron analysis, SILICON alloys, MOLYBDENUM, INOCULATION (Founding), THERMAL analysis
Abstract

Solidification pattern of three ductile iron compositions [I-2.5%Si; II-4%Si, and III-4%Si-1.6%Mo] is studied, to evaluate the effects of high Si and Mo contents. Inoculation compensates for the negative effect of Mo on eutectic undercooling. The deviation using a sphere as reference of graphite particles is noticeably increased by silicon alloying, when a characteristic of the graphite particles appears have a larger perimeter, resulting in a large category [IV, V and VI forms, ISO 945]. The sphericity shape factor (SSF) considering the real perimeter of particle is recommended in the nodularity evaluation in high-Si ductile iron, instead of the roundness shape factor, involving maximum ferret, presently incorporated in the ISO 945 standard. The higher the minimum acceptable SSF is, the greater difference in nodularity, between conventional and Si-alloyed ductile irons. For more than 4%Si, ductile irons are characterized by a medium-quality graphite phase, with prevalent form V-ISO 945 graphite. A specific inoculant, with a powerful action on the graphite particle compactness, especially to promote VI graphite form, is necessary. [ABSTRACT FROM AUTHOR]

Published
2019
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45. Benefits of Residual Aluminum in Ductile Iron

Author

Riposan, Iulian, primary, Chisamera, Mihai, additional, Stan, Stelian, additional, Toboc, Pavel, additional, Grasmo, Geir, additional, White, Douglas, additional, Ecob, Chris, additional, and Hartung, Cathrine, additional

Published
2010
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49. Iron casting skin management in no-bake mould -- Effects of magnesium residual level and mould coating.

Author

Chisamera, Mihai, Ivan, Nicoleta, Riposan, Iulian, and Stan, Stelian

Subjects
IRON founding, MAGNESIUM compounds, GRAPHITE, DESULFURIZATION, SOLIDIFICATION
Abstract

The relative performance of coatings for furan resin sand moulds [P-toluol sulphonic acid (PTSA) as hardener] [FRS-PTSA moulds], was compared by analyzing the surface layer for degenerated graphite in Mg treated iron with 0.020wt.% to 0.054wt.% Mgres. It was found that the iron nodularising potential (Mg, Ce, La content) and whether the mould coatings contained S, or were capable of desulphurizing were important factors. These moulds have S in the PTSA binder, which aggravates graphite degeneration in the surface layer, depending strongly on the Mgres with lower Mgres increasing the layer thickness. The application of a mould coating strongly influenced graphite deterioration in the surface layer of castings. It either promoted graphite degeneration to less compact morphologies when using S-bearing coatings, or conversely, limited the surface layer thickness using desulphurization type coatings. Independently of the S-source at the metal - mould interface, the presence of sulphur had an adverse effect on graphite quality at the surface of Mg-treated irons, but its negative effect could also reach the graphite phase within the casting section. If the coatings employed desulphurization materials, such as MgO, or a mixture (CaO + MgO + Talc) or Mg-bearing FeSi, they protected the graphite shape, improving graphite nodularity, at the metal - mould interface, and so decreased the average layer thickness in FRS-PTSA moulds. FeSiMg was highly efficient in minimizing the casting skin by improving graphite nodularity. It is presumed that the MgO or (MgO + CaO + Talc) based coatings acted to remove any S released by the mould media. The Mg-FeSi coatings also reacted with S from the mould but additionally supplemented the Mg nodularising potential prior to solidification. This dual activity is achievable with coatings containing active magnesium derived from fine Mg-FeSi materials. [ABSTRACT FROM AUTHOR]

Published
2015

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