MICROSTRUCTURE EVOLUTION OF THE SHELL IN CENTRIFUGAL CASTING
The joining of A356 alloy to an Al-18wt％Si alloys has been performed in centrifugal casting. The influence of the mold preheating temperature, the pouring temperature and rotational velocity of the mold on the microstructures of the shell in the centrifugal casting was investigated using experimental and simulational method. In the present study, the cellular automaton (CA) technique and the finite volume method (FVM) were adopted to simulate the evolution of the macrostructures and calculate the temperature profiles, respectively. The evolution of the microstructures was simulated using a modified cellular automaton (MCA) model. The optimal mold speed for the sound shape of the shell was analyzed as an over 1300 rpm from the simulation and the experiment. The mold was preheated from 30℃ to 250℃, and the molten Al-18wt％Si alloy was poured into the mold at the temperature of 610℃, 650℃ and 700℃. Then the molten A356 alloy was poured into the mold at the temperature of 620℃, 650℃ and 690℃. The equiaxed zone becomes narrower with decrease in the pouring temperature as well as increase in the mold preheating temperature. The present simulation model can successfully predict the evolution of solidification structures of the shell in centrifugal casting.
centrifugal casting cellular automaton finite volume method equiaxed zone.
Y.S. JANG M.H. LEE J.Y. MOON C.P. HONG
Center for Computer-Aided Materials Processing (CAMP), Dept. of Metallurgical Engineering, Yonsei University, Shinchon-dong 134, Seodaemun-ku, Seoul, 120-749 Korea
国际会议
大连
英文
311-318
2007-08-19（万方平台首次上网日期，不代表论文的发表时间）