|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Application of Solidification Fundamentals to Challenges in Metal Additive Manufacturing
||The Effect of Grain Refiners on the Columnar to Equiaxed Transition in Metal Additive Manufacturing of Aluminium Alloys
||Mitesh Patel, Dong Qiu, Gui Wang, Mark Gibson, David H. StJohn, Mark A. Easton
|On-Site Speaker (Planned)
One of the key microstructural issues in Metal Additive Manufacturing (MAM) is that a columnar grain structure tends to form. This is most likely due to the high temperature gradients involved in MAM and/or the constitution of typically used alloys, such as Ti6Al4V, with low propensity to generate sufficient constitutional supercooling to promote equiaxed grain formation.. This work shows how the addition of grain refiner (Al-Ti-B) to hypoeutectic Al-Cu and Al-Si alloys during laser surface remelting, can change the grain morphology. Furthermore the role or processing parameters is also investigated. The analysis involves relating grain size, <I>d</I>, with the inverse of the growth restriction factor, <I>Q</I>, to understand the influence of constitutional supercooling and addition of grain refiner in the solidification processes similar to MAM.
||Planned: Supplemental Proceedings volume