naa a22 4500 51077041X CHVBK 20180411083211.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11837-013-0662-8 doi (NATIONALLICENCE)springer-10.1007/s11837-013-0662-8 Prediction of Hot Tear Formation in Vertical DC Casting of Aluminum Billets Using a Granular Approach [Elektronische Daten] [M. Sistaninia, J.-M. Drezet, A. Phillion, M. Rappaz] A coupled hydromechanical granular model aimed at predicting hot tear formation and stress-strain behavior in metallic alloys during solidification is applied to the semicontinuous direct chill casting of aluminum alloy round billets. This granular model consists of four separate three-dimensional (3D) modules: (I) a solidification module that is used for generating the solid-liquid geometry at a given solid fraction, (II) a fluid flow module that is used to calculate the solidification shrinkage anddeformation-induced pressure drop within the intergranular liquid, (III) a semisolid deformation module that is based on a combined finite element/discrete element method and simulates the rheological behavior of the granular structure, and (IV) a failure module that simulates crack initiation and propagation. To investigate hot tearing, the granular model has been applied to a representative volume within the direct chill cast billet that is located at the bottom of the liquid sump, and it reveals that semisolid deformations imposed on the mushy zone open the liquid channels due to localization of the deformation at grains boundaries. At a low casting speed, only individual pores are able to form in the widest channels because liquid feeding remains efficient. However, as the casting speed increases, the flow of liquid required to compensate for solidification shrinkage also increases and as a result the pores propagate and coalesce to form a centerline crack. TMS, 2013 Sistaninia M. Computational Materials Laboratory, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland aut Drezet J.-M Computational Materials Laboratory, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland aut Phillion A. School of Engineering, University of British Columbia, Okanagan, V1V 1V8, Kelowna, BC, Canada aut Rappaz M. Computational Materials Laboratory, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland aut JOM Springer US; http://www.springer-ny.com 65/9(2013-09-01), 1131-1137 1047-4838 65:9<1131 2013 65 11837 https://doi.org/10.1007/s11837-013-0662-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11837-013-0662-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sistaninia M. Computational Materials Laboratory, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland aut NATIONALLICENCE 700 1- Drezet J.-M Computational Materials Laboratory, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland aut NATIONALLICENCE 700 1- Phillion A. School of Engineering, University of British Columbia, Okanagan, V1V 1V8, Kelowna, BC, Canada aut NATIONALLICENCE 700 1- Rappaz M. Computational Materials Laboratory, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland aut NATIONALLICENCE 773 0- JOM Springer US; http://www.springer-ny.com 65/9(2013-09-01), 1131-1137 1047-4838 65:9<1131 2013 65 11837 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer