Effect of Rotational Speeds on the Cast Tube During Vertical Centrifugal Casting Process on Appearance, Microstructure,
- PDF / 2,566,056 Bytes
- 7 Pages / 593.972 x 792 pts Page_size
- 63 Downloads / 194 Views
DUCTION
MELT flow during casting process is an active research area in the present scenario as it plays a vital role in defining quality product.[1] It is important to understand the underlying features involved in fluid flow and its effect in the casting process. Jaluria[2] has reviewed some important aspects, consideration, and future goals on fluid engineering in the casting process and has also explained the basic problems, solution strategies, and issues involved in this area. Centrifugal casting is one of the techniques in material processing in which the flow pattern of the molten metal strongly affects the quality of the final product. Shailesh[3–5] investigated the fluid flow analysis in horizontal centrifugal casting machine, wherein cold modeling experiments are correlated with actual casting. Further the papers described the analysis of the melt flow in horizontal centrifugal casting and optimum speed, above and below which, non-uniform cast tubes are formed. He also mentioned that many works need to be investigated in this area. The appearance, microstructure and wear properties of Al 2Si alloy with horizontal casting process is explained.[5] In horizontal casting the fluid gets lift by the inner mold surface after pouring. The melt also moves in a horizontal direction at lower rotational speed of the mold, whereas in vertical centrifugal casting process, the melt initially settles down the mold surface, then moves along the circumference and finally in upward direction. Ping[6] A. SHAILESH RAO, Professor and Head, is with the Department of Mechanical Engineering, KS School of Engineering and Management, Bangalore, 560062, Karnataka, India. contact e-mail: shaileshra@ gmail.com MAHANTESH S. TATTIMANI, Assistant Professor, is with the Department of Mechanical Engineering, S G Balekundri Institute of Technology, Belgaum, 590010, Karnataka, India SHRIKANTHA S. RAO, Associate Professor, is with the Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, India. Manuscript submitted April 9, 2014. METALLURGICAL AND MATERIALS TRANSACTIONS B
reported that no systematic investigation of microstructure evolution in centrifugal casting has been done to understand the mechanical properties of the material. Chang[7] studied the influence of process parameters on the micro- structure formation in vertical centrifugal casting, but did not explain the effect of the flow pattern of liquid metal during casting. Li Changyun[8] correlated the gravity and vertical centrifugal casting process with process parameters and mentioned that the rotational direction, speed play a vital role in the formation of defects in casting. Rzychon[13] discussed the effect of pouring temperature on the microstructure of Mg alloys and concluded that there is a decrease in the grain size with the reduction in pouring temperature due to the lower solidification process. Jabbari[14] discussed the effect of cooling rate on the primary dendrite arm spacing; secondary dendrite arm spacing and the hardness (HB) were evaluated in con
Data Loading...
