In-Mould Graphitizing, Spheroidizing, and Carbide Stabilizing Inoculation of Cast Iron Melt

Фесенко, М. А.; Fesenko, Anatoliy

doi:10.15407/ufm.21.01.083

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…It is well known that the mechanical properties of cast irons strictly depend on their microstructures [7]. Moreover, the crystallization and graphitization of cast iron are very strongly influenced by its chemical composition [6,17]. Thus, the control of the later as well as the mechanical properties and the microstructure were carried out on the final product at the outlet of the furnaces and in the treatment ladle after having added 3 kg of ferrosilicon FeSi75 for inoculation purposes.…”

Section: Demanganization Processmentioning

confidence: 99%

“…Due to the economic benefits it offers, cast iron is used for many applications such as water pipes [3][4][5], machine building, in the automotive industry and in metal fabrication and processing [2]. Until today, cast iron still constitutes the majority (≈70%) of metal castings [1,6]. In addition, specific cast irons are the material of choice for seawater pump casings, rolling mill rolls and earthmoving machinery parts [2,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Until today, cast iron still constitutes the majority (≈70%) of metal castings [1,6]. In addition, specific cast irons are the material of choice for seawater pump casings, rolling mill rolls and earthmoving machinery parts [2,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Production of Lamellar Cast Iron EN-GJL-150 From Local Manganese-Rich Pig Iron by Modification of the Melting Process

Sitouah

Cherfi

Oualit

et al. 2022

Advances in Materials Science

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In the present study, a modified duplex melting process was set up so as to be able to produce an EN-GJL-150 gray cast iron from a local manganese-rich pig iron. A descriptive statistics showed an average Mn and Si content in raw material such that: Mn % = 2.457±0.133 and Si % = 0.682±0.088. The demanganization process was run and monitored in a cascade of two industrial-scale furnaces: a rotary kiln and an electric arc furnace. The performed experiments indicated that: 1) the manganese content decreased from 2.45 % to 0.94 %, 2) the manganese oxidation obeys the first order kinetic model, 3) Brinell and Rockwell hardness’s decreased by 38.83% and 27.81% respectively, and 4) the produced cast iron has a pearlitic microstructure with a small fraction of ferrite (1 to 5%) in the matrix and traces of cementite. All results showed that the produced castings comply with the standards in force for EN-GJL-150 cast irons, similar to gray cast iron ASTM A48 Class 20.

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Section: Demanganization Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Production of Lamellar Cast Iron EN-GJL-150 From Local Manganese-Rich Pig Iron by Modification of the Melting Process

Sitouah

Cherfi

Oualit

et al. 2022

Advances in Materials Science

View full text Add to dashboard Cite

show abstract

“…An effective process of obtaining a given structure of cast iron is the modification of the melt [11], including in the casting system in the process of pouring the mold to obtain twolayer castings. However, the proposed technologies are designed for shaped small castings and cannot be used for massive castings, which are cast iron rolls, because the duration of hardening of the working layer is much longer.…”

Section: Introductionmentioning

confidence: 99%

Graphitizing modification of the axial zone of cast iron rolling rolls in the liquidus-solidus temperature range

Khrychikov¹,

Meniailo²,

Semenov³

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. To develop a method for calculating a process of graphitizing modification of unsolidificated liquid-solid zone to reduce transcrystallinity of the macrostructure and the amount of cementite in the center of castings. Methodology. The duration of solidification of the castings was determined by the kinetic curves of liquidus, solidus and pouring boundary in coordinates of relative thickness of the solidified metal layer – the parametric criterion of Gulyaev. Findings. A methodology for the process of modification of the axial zone of rolling was developed, the mass and time of adding aluminum were determined according to the amount of liquid-solid phase that remains after the solidification of the working layer. On the example of a rolling roll weighing 1115 kg, 0.488 kg of aluminum was added into liquid-solid zone after the working layer solidified. Movement of aluminum to the front of crystallization is provided by centrifugal forces and adding of aluminum along the height of the roll. Originality. For the first time, the kinetic curves of liquidus, solidus and pouring boundary have been plotted in coordinates of the relative thickness of the solidified metal layer x/R and /R2 – the parametric criterion of Gulyaev for rolled cast iron alloys cooled in chill-sand molds of various sizes. A methodology was developed for calculating the process of aluminum modification of the axial zone of rolling rolls after solidification of the working layer in the barrel which was set at the pouring boundary. The amount of aluminum depends on the remains of the liquid-solid phase. Practical value. Graphitizing modification reduces transcrystallinity of the macrostructure and the amount of cementite in the axial zone of castings. A promising direction for further development is the development of new methods for manufacturing castings due to physical and mechanical effects on the two-phase zone, deoxidation and alloying of the central zones of castings.

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“…Literature review. Foundry production is the basis of modern engineering and many other industries [1,2]. Improving the quality and competitiveness of cast parts from traditional and new alloys [3], including composite ones [4,5], is impossible without technical progress in developing molding materials and improving their properties.…”

mentioning

confidence: 99%

Synthesis of phosphosulphate substance and properties of its structured mixture with quartz sand

Liutyi¹,

Tyshkovets²,

Yamshinskij³

et al. 2022

Nauk. visn. nat. hirn. univ.

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Purpose. Creation of binder based on orthophosphoric acid and aluminum sulfate, study on its structure and physicochemical patterns of formation, determination of the properties of structured mixtures for the needs of foundry. Methodology. In the work, X-ray qualitative and quantitative analysis was performed on the Rigaku Ultima IV unit, and differential thermal analysis was performed on the STA 449 C Jupiter synchronous thermal analyzer. Orthophosphoric acid, technical thermal, of 85% concentration, 18-hydrous sulfate of aluminum Al2(SO4)3 18H2O and quartz sand of brand 3K5O3025 were used. The strength of core mixtures was determined on the US-700 unit on standard cylindrical samples with a diameter and height of 50mm. The roughness of the cast surfaces was determined on a profilometer model 107622 with computer processing of the obtained data and construction of profilograms. To determine the propensity of the core mixtures to form caking, a hexagon sample was used according to the method by M.Fedorov. Breakability was determined on standard cylindrical samples with a diameter and height of 50 mm according to the original method described in the text of the article. Findings. For the first time, the mechanism of formation of aluminum phosphates with binding properties during the interaction of aluminum hydrate crystal sulfate Al2(SO4)3 18H2O with orthophosphoric acid in the temperature range of 100200 has been investigated. The formation is proved of an intermediate phase during heating aluminum hydroxide Al(OH)3, which, in contrast to its sulfate, according to the results of thermodynamic analysis is able to interact with acid. Formation of aluminum in the system of ortho- and metaphosphates, which features binding properties and ensures high strength of samples based on quartz filler, has been established. The thermal transformations of the obtained binder, which consists of a combination of aluminum phosphates with its residual sulfate, are studied. Stages of gradual disintegration of crystal hydrates, formation of new aluminum phosphates and thermal decomposition of residual sulfate are recorded. The tendency to burn and knockout of the developed core mixtures was determined. Originality. For the first time, a description has been developed of the mechanism of formation of aluminum phosphates with binding properties during the interaction of its sulfate crystal hydrate Al2(SO4)3 18H2O with orthophosphoric acid in the temperature range of 100200. Practical value. A new inorganic binder from orthophosphoric acid and 18-aqueous aluminum sulfate has been obtained for foundry production. The scheme of its preparation involves preliminary mixing and heating of the specified reagents with the resulting formation of a dry powder material which consists of phosphates and residual aluminum sulfate, and therefore it is called phosphosulfate. The binding has a long shelf life and is introduced into the mixture in a ready-made form while the technology of its production is less energy-intensive and long-lasting compared to the preparation of traditional metal phosphate binding.

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In-Mould Graphitizing, Spheroidizing, and Carbide Stabilizing Inoculation of Cast Iron Melt

Cited by 7 publications

References 6 publications

Production of Lamellar Cast Iron EN-GJL-150 From Local Manganese-Rich Pig Iron by Modification of the Melting Process

Production of Lamellar Cast Iron EN-GJL-150 From Local Manganese-Rich Pig Iron by Modification of the Melting Process

Graphitizing modification of the axial zone of cast iron rolling rolls in the liquidus-solidus temperature range

Synthesis of phosphosulphate substance and properties of its structured mixture with quartz sand

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