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Microstructure and Mechanical Properties of Thin Wall Ductile Iron

Rajat Upadhyaya, Kamlesh Kumar Singh, Rajeev Kumar

Abstract


Currently many cast parts are produced in aluminium rather than cast iron, because of the drive to get high strength/weight ratio for application in automobile and aerospace. Ductile iron casting of approximately 2–3 mm section thickness better known as thin wall ductile iron (TWDI) having high strength/weight ratio and better mechanical properties than aluminium alloys. The effect of various parameters like, post inoculation, gating and feeding, moulding sand mix on the structure and properties of TWDI were studied and it was observed that for a thin plate, decrease in pouring temperature leads to finer pearlitic structure and increase in hardness. In the present work, the effect of inoculation on thin wall ductile iron castings is analyzed. Three types of potent inoculants were used namely Ce-Ca-Al-S-O-FeSi, Zr-Mn-Ca-Al-Ba-FeSi and Sr-Al-Ca-FeSi. The in-mould inoculation was done. It is observed that Ce-Ca-Al-S-O-FeSi at 0.4% inoculant provides highest nodule count and a unique wide distribution of nodule size in comparison to thin wall ductile iron (TWDI) inoculated with Zr-Mn-Ca-Al-Ba-FeSi and Sr-Al-Ca-FeSi at 0.4%.

Cite this Article Rajat Upadhyaya, Kamlesh Kumar Singh, Rajeev Kumar. Microstructure and Mechanical Properties of Thin Wall Ductile Iron. Journal of Automobile Engineering and Applications. 2017; 4(2): 35–39p.


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