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The effect of the melt thermal gradient on the size of the constitutionally supercooled zone

Prasad, A; Yuan, L; Lee, PD; Easton, M; StJohn, D; (2016) The effect of the melt thermal gradient on the size of the constitutionally supercooled zone. In: IOP Conference Series: Materials Science and Engineering. IOP: Windsor, UK. Green open access

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Abstract

Recent verification of the analytical Interdependence model by a numerical solidification model (μMatIC) confirmed the critical role of constitutional supercooling (CS) in achieving sufficient undercooling to trigger successful nucleation events. The location of the maximum amount of CS (ΔT CSmax ) is some distance from the interface of the previously growing grain and this distance contributes to the final as-cast grain size. The effect of the thermal gradient, G, on the size of the CS zone (CSZ) was neglected in that work. However, G is expected to affect the size of the CSZ (i.e. the length of the CSZ, x' CSZ , and the location of ΔTCSmax, x' CSmax ). This investigation assesses the effect of G on x'csz and x' CSmax . A range of G values is introduced into both the analytical and the numerical models to obtain a correlation between the value of G and the dimensions of the CSZ. The result of a test case from the analytical model shows that x' CSmax initially decreases rapidly and then decreases gradually approaching zero at very high values of G. Independent of the analytical model, the results from the numerical model replicate the trend obtained from the analytical model.

Type: Proceedings paper
Title: The effect of the melt thermal gradient on the size of the constitutionally supercooled zone
Event: 4th International Conference on Advances in Solidification Processes (ICASP-4)
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1757-899X/117/1/012001
Publisher version: http://dx.doi.org/10.1088/1757-899X/117/1/012001
Language: English
Additional information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (http://creativecommons.org/licenses/by/3.0). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10049207
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