Method for modifying cast iron with briquetted powder modifiers during casting by gasification models

DOI: 10.62564/M4-AT2301

Gennadii Bagliuk, Natalia Uskova, Anatolii Trotsan, Aleftina Mamonova, Galina Molchanovska

Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine


At present, the most promising direction in the development of technology for the production of low-strength cast iron with spheroidal graphite is inoculation in a casting mold [1]. In this work, the parameters for obtaining castings from ductile iron during their processing with briquetted powder modifiers were developed. The structural and phase mechanism of the interaction of alloying elements (magnesium, silicon, manganese, rare earth metals, TiN2-TiC) on the structure and properties of cast iron intended for the manufacture of parts by casting on gasified models. Modifying briquettes containing 10%Mg, 50% ferrosilicon niobium, 2%CaF, 38%Fe with the addition of FS30REM 10% in one composition from the addition of 1% TiN2-TiC in the other were placed in a casting molds in an amount of 2% by weight of the metal being processed. Microstructural and X-ray phase studies of the alloy indicate their multiphase composition. The X-ray spectrum of unmodified cast iron is represented by the hardening carbide phases SiC, Fe3C, C and the α-Fe phase. The microstructure of original cast iron is pearlite and lamellar graphite. The phase composition of cast iron of modified composition of rare-earth metals is represented by the main phase α-Fe, carbides Fe3C, SiC. A characteristic feature of the alloy is the formation of the FeSiC phase. When 1% TiN2 –TiC is added to briquettes, along with the phases C, SiC, Fe3C, α-Fe, complex titanium carbides based on TiC are formed - C0.7N0.3Ti and C0.3N0.7Ti. The parameters of the fine structure of cast iron with a modified composition of REM and TiN2 –TiC testify to the high dispersion of the coherent scattering region equal to 26.7 nm. When studying the features of the morphology of the structure of alloys on a microanalyzer of modified cast iron of all compositions in thin-lamellar pearlite, partial spheroidization of the carbide phase occurs. Processing cast iron using this technology ensures good strength properties of castings.

Keywords
cast iron, gasification models, briquetted powder modifiers

Acknowledgments
Not provided

References
[1] G. Baglyuk, V.Kurovskiy. The features of structure and properties of high-strength cast irons, treated with briqueted powder modifiers 9th international congress "Machines, technolоgies, materials`2012" 19 – 21.09.2012, Varna, Bulgaria, P.86-89.