Effect of Coating Layer of Sand Casting Mold in Thin-Walled Ductile Iron Casting: Reducing the Skin Effect Formation
The effect of various coating layers on the skin effect formation in thin-walled ductile iron casting with glass wool heat insulator has been investigated. Graphite, MgO, Zr, Zr + graphite, MgO + graphite coating layers have been used. We observed that the different coating layers can be used to control cooling rate. Higher heat conductivity coating layer yields lower cooling rate, while lower heat conductivity yields higher cooling rate. The use of double layer can further increase cooling rate which was observed for Zr + graphite and MgO + graphite double coating layers. These may only be applicable in our system. Higher cooling rate system produces a casting product that has thinner skin effect. The use of MgO layer yields lower skin effect thickness which stood at 52.27 µm.
Keywordsthin-walled ductile iron coating layers cooling rate
Authors thank the Indonesian government for research funding. Authors also thank Geteka Fourindo company which allowed us to conduct our experiment in its factory.
- 1.E.N. Pan, C.C. Fan, H.Y. Chang, High Temperature Thermal Fatigue Property of Thin-Section Ductile Cast Iron (American Foundry Society, Schaumburg, 2010)Google Scholar
- 3.R.A. Martinez, R.E. Boeri, J.A. Sikora, Application of ADI in high strength thin wall automotive parts, in Proceedings of the 2002 World Conference on ADI. AFS (2002) (pp. 144–148)Google Scholar
- 4.D.M. Stefanescu, L.P. Dix, R.E. Ruxanda, C. Crobitt-Coburn, T.S. Piwonka, Tensile properties of thin wall ductile iron. AFS Transactions, 110 (2002)Google Scholar
- 5.J.W. Soedarsono, R.D. Sulamet-Ariobimo, Effect of casting design to microstructure and mechanical properties of 1 mm thin walled ductile iron plate, in Applied Mechanics and Materials, Vol. 110 (Trans Tech Publications, 2012) pp. 3301–3307Google Scholar
- 6.H. Reisener, Some aspects of the formation and structure of a skin on iron castings and a method used to obviate its occurrence. The British Foundryman, (1962) pp. 362–369Google Scholar
- 7.R.C. Aufderheide, R.E. Showman, M.A. Hysell, 05-043 controlling the” skin effect” on thin-wall ductile iron castings. Trans.-Am. Foundrym. Soc. 113, 567 (2005)Google Scholar
- 8.R.E. Ruxanda, D.M. Stefanescu, T.S. Piwonka, Microstructure characterization of ductile thin-wall iron castings. Trans.-Am. Foundrym. Soc. 2, 1131–1148 (2002)Google Scholar
- 9.G.M. Goodrich, R.W. Lobenhofer, Effect of cooling rate on ductile iron mechanical properties, in Transactions of the American Foundry Society and the One Hundred Sixth Annual Casting Congress,(2002) pp. 1003–1032Google Scholar
- 10.D. Dhaneswara, B. Suharno, N.D. Nugraha, R.D.S. Ariobimo, N. Sofyan, Effects of ceramic fibre insulation thickness on skin formation and nodule characteristics of thin wall ductile iron casting, in IOP Conference Series: Materials Science and Engineering, Vol. 176, No. 1 (IOP Publishing, 2017), p. 012032Google Scholar
- 14.O.N. Dogan, K.K. Schrems, J.A. Hawk, Microstructure Of Thin-Wall Ductile Iron Castings (No. DOE/ARC-2004-041). (Albany Research Center (ARC), Albany, 2003)Google Scholar
- 15.A.I. Al-Ghonamy, M. Ramadan, N. Fathy, K.M. Hafez, A.A. El-Wakil, Effect of graphite nodularity on mechanical properties of ductile iron for waterworks fittings and accessories. Int. J. Civil. Environ. Eng. 10, 1–5 (2010)Google Scholar