Sensitivity analysis of dendritic growth kinetics in a Bridgman furnace front tracking model

R. P. Mooney, S. McFadden

Research output: Contribution to journalConference article

Abstract

A directional solidification experiment of a Ti-Al-Nb-B-C alloy by power down method is simulated using a Bridgman furnace front tracking model. The effect of varying the dendritic growth parameters; C, the columnar dendrite growth coefficient, and n, the undercooling exponent, is investigated. A matrix of growth coefficients and undercooling exponents - at three levels each, based around a growth law for Ti-46wt.%Al - is applied in simulations, and the effect on columnar dendrite tip temperature, tip velocity, and tip temperature gradient is observed. The simulation results show that the dendrite tip velocity and temperature gradient at the tip are practically unaffected by the use of different growth parameters. However, the predicted columnar dendrite tip undercooling did vary to give the required dendrite tip velocity. This finding has implications for the analysis of microstructural transitions, such as the Columnar to Equiaxed Transition (CET). In conclusion, it is suggested that, for transient solidification conditions, a CET prediction criterion based on tip undercooling is preferable to one that uses growth velocity.

Original languageEnglish
Article number012012
JournalIOP Conference Series: Materials Science and Engineering
Volume117
Issue number1
DOIs
Publication statusPublished - 31 Mar 2016
Event4th International Conference on Advances in Solidification Processes, ICASP 2014 - Windsor, United Kingdom
Duration: 8 Jul 201411 Jul 2014

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