Numerical simulaton of cellular/dendritic transition and its growth during unidirectional solidificationin of Ti–Al alloy

Acta Metall Sin

2007, Vol. 43

Issue (2): 211-216 DOI:

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Numerical simulaton of cellular/dendritic transition and its growth during unidirectional solidificationin of Ti–Al alloy

Wang Kuangfei;

哈尔滨工业大学河南理工大学

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Wang Kuangfei. Numerical simulaton of cellular/dendritic transition and its growth during unidirectional solidificationin of Ti–Al alloy. Acta Metall Sin, 2007, 43(2): 211-216 .

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Abstract Solute diffusion controlled solidification model were applied to simulate the initial stage cellular to dendrite transition of Ti55Al45 alloys during directional solidification at different velocities. The simulation results show，during cellular/dendritic transition , mixed structure zone composed of cells and dendrites was observed ，with two parallel closely spaced dendrites with secondary dendrites absent at the facing surfaces . The dendrite spacing are larger than that of cellular spacing at a given rate, the columnar grain spacing sharply increases to a maximum as solidification advance to coexistence zone. In addition, simulation also revealed the numbers of the seeds also exert an influence on the grain spacing, with increasing the numbers of the seed, the uniform degree of the columnar grain spacing tends to increase. Lastly the main influence factors of affecting cellular/dendritic transition were analyzed, which could be dendrite growth resulting in slight fluctuations of liquid composition occurred at growth front. The simulation results also are in reasonable agreement with experiment observation at low cooling rates.

Key words: TiAl alloy Cell/dendrite transition Solute diffusion controlled model

Received: 08 May 2006

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