|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Cast Shop Technology
||Experimental Study and Numerical Analysis of Cracking during DC Casting of Large Dimension 7075 Aluminium Billets
||Kjerstin Ellingsen, Qiang Du, Mohammed M'Hamdi, Britt-Elin Gihleengen, Rune Ledal, Knut Omdal Tveito, Arild Håkonsen
|On-Site Speaker (Planned)
AA7xxx alloys are hard to cast as the chemistry of the alloys make them prone to both hot and cold cracking. The difficulty to cast sound billets increases with billet diameter due to increasing thermal gradients and associated stress build-up in the center. In this paper, 7075 Ø405 mm billets with varying chemical composition cast by Low Pressure Casting technology™ have been studied using numerical modelling and industrial trials. The microscopic structure evolution including solidification paths and secondary phase formation has been simulated using a microstructural software and combined with semi-quantitative predictions of both hot tearing and cold cracking tendencies using process modelling software. Combined with results from industrial cast trials, the correlation between alloy chemistry and critical casting speed has been analyzed.
||Planned: Light Metals