Mechanism of silicon influence on chills in ductile iron

• Autorzy: Górny M.
• Języki publikacji: EN

Abstrakty

EN

In the present work an analytical expression that combines the susceptibility of liquid cast iron to solidify according to the Fe-C-X metastable system (also known as the chilling tendency of cast iron, CT) is proposed. A relationship between CT and several factors has been developed. In particular the CT is related to the critical wall thickness (Scr), below which the chill is formed. Theoretical calculations of Scr were made and then compared with experimental outcome for ductile iron melts. The predictions of the theoretical analysis are in rather good agreement with the experimental data.The results can be used as a guide for a better understanding of the effect of technological variables such as the melt chemistry, the holding time and temperature, the spheroidizing and inoculation practice, the resulting nodule count and the type of mold material and pouring temperature, on the resultant chill of the ductile iron.

Słowa kluczowe

EN

thin wall ductile iron; chilling tendency; chill

PL

odlewanie cienkościenne; żeliwo sferoidalne; skłonność do zabieleń; zabielenie

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2009
• Tom: Vol. 9, iss. 1
• Strony: 147--150
• Opis fizyczny: Bibliogr. 12 poz., tab., wykr.

Twórcy

autor

Górny M.

• University of Science and Technology, Reymonta 23 Str., 30-059 Kraków, Poland,

Bibliografia

• [1] A. Javaid, J. Thompson and K. G. Davis, Critical Conditions for Obtaining Carbide-Free Microstructures in Thin-Wall Ductile Irons.AFS Trans., vol. 110 (2002), 889-898.
• [2] A. Javaid, J. Thompson, M. Sahoo and K. G. Davis, Factors Affecting the Formation of Carbides in Thin-Wall DI Castings. AFS Trans. vol. 107 (1999), 441-456.
• [3] R. E.Ruxanda, D. M. Stefanescu, T. S. Piwonka, Microstructure Characterization of Ductile Thin-Wall Iron Castings, AFS Trans., vol. 2002, 1131-1148.
• [4] A. Giacopini, R. E. Boeri, J. A. Sikora, Carbide dissolution in thin wall ductile iron. Mats Sci. And Tech, vol. 19, No.12, (2003), 1755-1760.
• [5] C. Labrecque, M. Gagne, Production and properties of thin-wall ductile iron castings. Int. J. Cast Met. Res., vol. 16, (2003), 313-317.
• [6] J. H. Choi, J. K. Oh, C. O. Cho, J. K. Kim, P. K. Rohatgi, Effect of Bi on Formation of Microstructure and Mechanical Properties of Ductile Iron Castings With Thin-Wall Section. AFS Trans., vol. 112, (2004), 831-840.
• [7] F. Mampaey, Z. A. Xu, Mold filling and solidification of thin-wall ductile iron casting. AFS Trans., vol. 105, (1997), 95-103.
• [8] R. E. Showman, R. C. Aufderheide, Process For Thin-Wall Sand Castings. AFS Trans., vol. 111, (2003) 567-578.
• [9] R.Wojnar, Effect of graphite size and distribution on fracture and fractography of ferritic nodular cast iron. Acta Stereol., vol. 5, No.5/2, (1986) 319-324.
• [10] K. Wiencek, J. Ryś., The estimation of Fe3C particle density in steel by simple counting measurements made in plane sections. Mat Eng., No. 3, (1986) 396-399.
• [11] E. Fras, M. Górny, H.López, Eutectic transformation in ductile cast iron. Part I. Theoretical background. Metall. and Foundry Eng., vol. 31, (2005) 113-136.
• [12] J. Agren, Scripta Metallurgica, A revised expression for the diffusivity of carbon in binary Fe-C austenite. vol. 20, (1986), 1507-1510.