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M. BIzJAk et al.: ThE ChARACTERIzATIon of PhAsE TRAnsfoRMATIons In RAPIdLy soLIdIfIEd ... ConClusions Phase transformations in the ribbons of rapidly solidified alloys of Al-Fe and cu-Fe during the heating were 286 successfully investigated by measurements of the electrical resistance. it was established that the electrical resistance is effective sensitive method for sensing of the phase transformations by elements of the low diffusivity in the alloys, where the changes on Dsc were not perceived. The most significant reactions during the heating of the ribbons over the first interval change is the iron precipitation from the supersaturated solid solution of α and α Al Cu . The transformation process of unstable phases into the stable ones was simultaneously taking place beside the iron precipitation. At transition over the changes of the second interval the transformation of the metastable phases of aluminium with iron into the stable phase of Al fe and 13 4 acicular structure into the globular one were taking place respectively. referenCes [1] C. d. Lien, M. A. nicolet, Journal Vacuum science Technology B 2 (1984), 783. [2] k. n. Tu, G. ottaviani, U. Goesele, h. foel, Journal of Applied Physics 54 (1983) 4, 758. [3] X. W. Wendlandt:Thermal analysis, 3 rd , j. Wiley&sons, new York, 1986. [4] X. R. Chen, y. kirsh: Analysis of Thermally stimulated Processes, Pergamon Press, oxford, (1981). [5] i. Mamuzić, Metalurgija 43 (2004) 1, 3 - 12. [6] B. kosec, Euroteh 3 (2004) 5, 32 - 33. [7] G. Lojen, i. Anžel, A. c. kneissl, A. križman, e. Unterweger, B. kosec, M. Bizjak, Journal of Materials Processing Technology 162 - 163 (2005), 220 - 229. [8] M. ohring: The Materials science of Thin films, Academic Press, san diego, (1992). [9] L. B. Valdes, Proceedings of the IRE 42, (1954). [10] G. Riontino, C. Antonione, L. Battezzati, A. zanada, Material science Engineering A 123 (1991), 1166 - 1169. [11] h. Jones, Materials science and Engineering 5 (1969/70) 1, 1 - 18. [12] M. H. jacobs, A. G. Doggett, M. j. stowell, journal of Materials science 9 (1974), 1631 - 1643. METALURGIJA 45 (2006) 4, 281-286
S. S. BockUS BockUS: A STUdy of ThE MIcRoSTRUcTURE And MEchAnIcAL pRopERTIES of ... ISSn 0543-5846 METABk 45 (4) 287-290 (2006) Udc - Udk 621.74.047=111 A study of the microstructure And mechAnicAl properties of continuously cAst iron products S. Bockus, kaunas University of Technology, kaunas, Lithuania Received - primljeno: 2005-07-10 Accepted - Prihvaćeno: 2006-02-15 Original Scientific Paper - Izvorni znanstveni rad The horizontal continuous casting has a lot of advantages in comparison with traditional casting methods. But it has a few disadvantages and unsolved problems. The objective of this research was the experimental investigation of the effect of chemical composition of cast iron and the casting conditions on the microstructure and properties of continuously cast ingots. As a result, tensile strength, Brinell hardness, and pearlite content increased with increasing Cr, Cu, and Sb additions and decreasing carbon equivalent. As for microstructure of graphite, higher silicon to carbon ratio and lower solidification rate decreased a zone of interdendritic graphite. Nomograph of continuously cast iron structure was made. Key words: continuous casting, cast iron, mechanical properties, microstructure Studij mikrostrukture i mehaničkih svojstava kontinuirano lijevanih željeznih proizvoda. Horizontalno kontinuirano lijevanje ima brojne prednosti u usporedbi s tradicionalnim načinima lijevanja. Ali ono ima i nekoliko nedostataka i neriješenih problema. Cilj ovog istraživanja je bio ekspereminentalno utvrđivanje ujecaja kemijskog sastava lijevanog željeza i uvjeta lijevanja na mikrostrukturu i svojstva kontinuirano lijevanih ingota. Kao rezultat istraživanja utvrđeno je da vlačna čvrstoća, tvrdoća (HB) i sadržaj perlita rastu s porastom dodatka Cr, Cu i Sb, te smanjenjem ekvivalenta ugljika. S obzirom na mikrostrukturu grafita, viši odnos silicija i ugljika, te niža brzina skrućivanja smanjuju zonu interdendritnog grafita. Izrađenje i strukturni nomogram kontinuirano lijevanog željeza. Ključne riječi: kontinuirano lijevanje, lijevano željezo, mehanička svojstva, mikrostruktura introduction The rapid progress of technology requires improve the mechanical and operational properties of the main casting alloy - cast iron. In this respect continuous casting iron is in exceptional position by its properties [1]. continuous casting has its peculiarities, which, first of all predetermine grey cast iron microstructure and properties [2]. It is well known that the quality and properties of cast products are strongly related to the microstructure developed during solidification. This especially can be seen in the cross-sections of the cast iron ingots, where anomalous, intermediate and normal structural zones can be obtained. This is the result of specific ingot cooling and solidification conditions [3, 4]. Therefore, it is important to investigate the effect of the cooling rate on the microstructure of metal in order to regulate properties of ingots. Investigations of the continuously cast iron microstructure are important, because, by change of casting parameters it is possible to obtain necessary ingots properties in these parts of cross-section, where damaging effect of operational factors is most strong. It is well known that the quality and properties of cast products are strongly related to the chemical composition of cast iron too. however, only limited information is available in the literature about the effect of chemical composition on continuously cast iron ingots properties. consequently, the aim of the present paper was to investigate the effects of the solidification rate and various chemical elements on the microstructure and mechanical properties of continuously cast products. experimentAl procedures cast iron was melted in the standard line frequency induction furnace of capacity the 10 t. The iron charge contained steel scrap, cast iron returns, ferrosilicon (feSi75), ferromanganese (feMn75), ferrochrome (fecr65), pure copper and antimony. The average chemical composition of cast irons aimed at 3,4 - 3,6 % c, 2,0 - 2,1 % Si, 0,4 - 0,5 % Mn, 0,15 - 0,6 % cr, 0,03 - 0,04 % S and 0,08 - 0,09 % p. The industrial continuous casting machine was METALURGIJA 45 (2006) 4, 287-290 287
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