Influence of Pouring Temperature on The Formation of Spheroidal and Lamellar Graphite In Cast Iron

The objective of this research is to investigate the effect of pouring temperature on the microstructure of the cast iron. The pattern was designed with 300 mm of width and the thickness variations are 25 mm and poured at five different temperatures; 1300, 1325, 1350, 1375 and 1400oC. Several cast irons, prepared with different chemical compositions and microstructures (three lamellar and three spheroidal structures) have been examined by extensive mechanical testing and optical microscopy. The fluidity of spheroidal and lamellar graphite in cast iron increases with the pouring temperature. The numbers of nodules were decreased by increasing pouring temperature for spheroidal structures. Whereas, the numbers of flakes of lamellar structures changed by both pouring temperature and chemical composition. In general, with increasing pouring temperature, the amount of pearlite in the internal structure of both lamellar and spheroidal graphite cast iron materials were increased.

Keywords:

Spheroidal and lamellar graphite cast iron, pouring temperature tensile test, impact test,

PDF

___

[1]. S Z. L. Lu, Y. X. Zhou, Q. C. Rao, Z. H. Jin, J. Mater. Process. Technol. 116, 176-181, 2001 [2]. L. Ribeiro, A. Barbosa, F. Viana, A. Monteiro, Baptista, C. Dias, C. A. Ribeiro, Wear 270, 535-540, 2011 [3]. Z. R. Yang, D. S. Li, S. Q. Wang, M. X. Wei, J. Iron Steel Res. Int. 20 No.10, 81-86, 2013 [4]. S. Kumar, P. Kumar, H. S. Shan, Effect of Evaporative Pattern Casting Process Parameters on the Surface Roughness of Al-7% Si Alloy Casting. Journal of Materials Processing Technology. 182, 615-623, 2007 [5]. S. Kumar, P. Kumar, H. S. Shan, Optimation of Tensile Properties of Evaporative Casting Process Through Taguchi's Method. Journal of Materials Processing Technology. 204, 59-69, 2008 [6]. X. Yao, S. Shivkumar, Molding filling characteristics in lost foam casting process. Materials science and Technology. 31, 841-846, 1997 [7]. M. Khodai, N. Parvin, Pressure Measurement and Some Lost Foam Casting in Observation. Journal of Materials Processing and Technology. 206,1-8, 2008 [8]. S. Shivkumar, X. Yao, M. Makhlouf, Polymer Melt Interactions During Formation in the Lost Foam Process. Metallurgica et Materialia scripta. 33, 39-46, 1995 [9]. S. R. Shin, Z. H. Lee, Hydrogen Gas Pic-Up of Alloy During Lost Foam Casting Melt. Journal of Materials Science. 39, 1536-1569, 2004.