A MODIFIED TEST FOR DETERMINING THE FLUIDITY OF DUCTILE CAST IRON
Abstract
The aim of this experimental work was to design a modified test with which it will be possible to determine the fluidity of ductile cast iron. First, we planned the conceptual verification of the designed experiment, which was done by numerical simulations of the casting processes, followed by rapid mould fabrication using 3D printing. A measurement cell was placed in the mould cavity of the experimental chamber for further investigation of the cooling and solidification during casting. From the matrix of data obtained with the experiment, we defined the fluidity of the ductile iron EN-GJS-500-7. Also, we analysed the mechanical properties of the studied alloy, the microstructure, the chemical composition, and the results of the thermal analysis. In accordance with the expectations and theory from the literature, the fluidity in the experimental sample cast at a higher temperature was better than that cast at a lower temperature. Because of the faster cooling rate at the end of the channel of the experimental casting, the microstructure is fine, moreover, we obtain white solidification, ledeburite in the microstructure of the samples etched with Nital. At lower cooling rates, fewer graphite nodules appear in the microstructure, which are larger, and the portion of ferrite is greater.
References
2. B. Dewhirst, Castability Control in Metal Casting via Fluidity Measures: Application of Error Analysis to Variations in Fluidity Testing. Worchester: Faculty of the WORCESTER POLYTECHNIC INSTITUTE, 2008
3. J. Campbell, R. A. Harding, The Fluidity of molten metals. Birmingham: The University of Birmingham, 1994
4. A. Aran, Manufacturing properties of engineering materials: Lecture notes. ITU, Department of Mechanical Engineering, 2007
5. Trbižan, M. Livarstvo: internal script. Ljubljana. Faculty of natural sciences and engineering, Department of materials and metallurgy, 1994
6. M. Çolak, S. Kaya, Investigation of the Effect of Inoculant and Casting Temperature on Fluidity Properties in the Production of Spheroidal Graphite Cast Iron. Trans Indian Inst Met., 74 (2021) 2, 205-214, https://doi.org/10.1007/s12666-020-02159-5
7. A. H. Fazeli, H. Saghafian, S. M. A. Boutorabi, et al. The Fluidity of Aluminium Ductile Irons. Inter Metalcast (2021), https://doi.org/10.1007/s40962-021-00581-z
8. S. R. Pulivarti, A. K. Birru, Effect of Mould Coatings and Pouring Temperature on the Fluidity of Different Thin Cross-Sections of A206 Alloy by Sand Casting. Trans Indian Inst Met, 71 (2018), 1735–1745, https://doi.org/10.1007/s12666-018-1311-2
9. M. Borouni, B. Niroumand, M. H. Fathi, Effect of a nano-ceramic mold coating on the fluidity length of thin-wall castings in Al4-1 alloy gravity sand casting. Mater. Technol., 48 (2014), 473–477
10. G. L. V. Adabo, G. R. De Paula, F. Noguiera, L. M. G. Fais, O. Peitl, A quality assessment of titanium castings produced in an experimental short-heating-cycle investment. Mat. Res., 17 (2013) 2, https://doi.org/10.1590/S1516-14392013005000194
11. M. Di Sabatino, F. Syvertsen, L. Arnberg, A. Nordmark, An improved method for fluidity measurement by gravity casting of spirals in sand moulds. International Journal of Cast Metals Research, 18 (2005), 59–62, https://doi.org/10.1179/136404605225022865
12. M. Di Sabatino, S. Shankar, D. Apelian, L. Arnberg, Influence of temperature and alloying elements on fluidity of Al-Si alloys, TMS 2005, Shape Casting : The John Campbell Symposium, 2005, 193–202
13. M. Gorny, Castability of ductile iron in thin walled castings. ARCHIVES of FOUNDRY ENGINEERING, 8 (2008) 3, 59–6
14. M. Gorny, Fluidity and Temperature Profile of Ductile Iron in Thin Sections. Journal of Iron and Steel Research, International, 19 (2012) 8, 52-59, https://doi.org/10.1016/S1006-706X(12)60139-3
15. S. Slamet, Suyitno, I. Kusumaningtyas, Effect of composition and pouring temperature of Cu (20-24) wt.% Sn by sand casting on fluidity and Mechanical Properties. Journal of Mechanical Engineering and Science, 13 (2019) 4, 6022-6035, 10.4108/eai.24-10-2018.2280525