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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 627528, 9 pages
http://dx.doi.org/10.1155/2014/627528
Research Article

Simulation of Microstructure during Laser Rapid Forming Solidification Based on Cellular Automaton

1School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang, Liaoning 110136, China
2Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China

Received 9 June 2014; Accepted 15 July 2014; Published 5 August 2014

Academic Editor: Jun Liu

Copyright © 2014 Zhi-jian Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The grain microstructure of molten pool during the solidification of TC4 titanium alloy in the single point laser cladding was investigated based on the CAFE model which is the cellular automaton (CA) coupled with the finite element (FE) method. The correct temperature field is the prerequisite for simulating the grain microstructure during the solidification of the molten pool. The model solves the energy equation by the FE method to simulate the temperature distribution in the molten pool of the single point laser cladding. Based on the temperature field, the solidification microstructure of the molten pool is also simulated with the CAFE method. The results show that the maximum temperature in the molten pool increases with the laser power and the scanning rate. The laser power has a larger influence on the temperature distribution of the molten pool than the scanning rate. During the solidification of the molten pool, the heat at the bottom of the molten pool transfers faster than that at the top of the molten pool. The grains rapidly grow into the molten pool, and then the columnar crystals are formed. This study has a very important significance for improving the quality of the structure parts manufactured through the laser cladding forming.