Structural gradient in a thin wall casting of ductile iron

• Autorzy: Fraś E. , Górny M.
• Języki publikacji: EN

Abstrakty

EN

In this paper a experimental and theoretical structural analysis of thin walled casting made of ductile iron is presented. The work shows that these castings posses a non-homogenous gradient structure associated with (i) the graphite nodule densities and (ii) the ferrite and cementite volume fractions. The microstructural inhomogeneities are attributed to sharp variations in the cooling rates along the length of the casting. The experimental investigations were made using of the castings with a 1.6 mm wall thickness, where the graphite nodule count, N_F and de fractions of ferrite, f_f and cementite eutectic, f_c were determined as a function of distance from the runner. It was found that the theoretical predictions were in good agreement with the experimental outcome. In particular, this work shows that it is possible to produce thin wall plate shaped castings made of nodular cast iron with wall thicknesses of 1.6 mm (without chills, cold laps, or misruns).

Słowa kluczowe

EN

thin wall casting; structure; gradient; ductile iron

PL

odlewanie cienkościenne; struktura; gradient; żeliwo sferoidalne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2007
• Tom: Vol. 7, iss. 4
• Strony: 63--68
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Fraś E.

autor

Górny M.

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

Bibliografia

• [1] Labrecque, C., Gagne, M., Production of thin-wall iron castings , Int. J. Cast Metals Research, vol. 16, 313 318, (2003).
• [2] Cuttino, J. F., Andrews, J. R., Piwonka, T.S., Development in thin-wall iron casting technology, AFS Transactions, vol. 107, 363-372, (1999).
• [3] Ryś J : Stereology of materials, Fotobit, Cracov, 1995.
• [4] Fraś E., Wiencek, Górny M, Thin wall ductille castings as a gradient Material, Archives of Metallurgy and Materials, 2006, vol. 50\1, nr.3, 423-431.
• [5] Fraś E., Górny M., Lopez H.F, Eutectic Cell and Nodule Count in Cast Iron. International Steel and Iron Japan Institute., ISIJ Int., vol. 47 (2007) No. 2, 259-268.
• [6] Fraś E., Górny M., Lopez H.F, Eutectic Cell and Nodule Count in Cast Iron- Experimental Verification. International Steel and Iron Japan Institute., ISIJ Int., vol. 47 (2007) No. 2, 269-276.
• [7] Fraś E, M. Górny, H.F. Lopez, Chilling tendency and nodule count in ductile cast iron Part I Theoretical Backgound, Transactions of the American Foundryman Society, vol.114, 575-594, 2006.
• [8] Fraś E, M. Górny, H.F. Lopez, Chilling tendency and nodule count in ductile cast iron Part II Exparimental verification, Transactions of the American Foundryman Society, vol.114, 595-603, 2006.
• [9] Fraś E, M. Górny, H.F. Lopez, Chilling tendency and nodule count in ductile cast iron Part III Thermal Analysis, Transactions of the American Foundryman Society, vol.114, 604-608, 2006