Defect Formation in Twin Roll-Cast AA 3xxx and 5xxx Series Aluminium Alloys

Microstructure and texture evolution after twin roll casting and subsequent cold rolling of Al–Mg–Mn aluminium alloys

“…Furthermore, microdefects must be tolerated if no macroscopic damages are detected. As a consequence, an AA3105 alloy (see Table 1 for the composition) has been twin rolled cast at high speed (>4.5 m min −1 ) to achieved a final gauge of 2 mm [2]. The productivity was approximately evaluated at 1.5 t m width −1 h −1 (1.5 tonnes per meter in strip width per hour).…”

“…. [2,3,8,9]). In addition to the rapid directional solidification, twin roll casting is characterised by a significant amount of concomitant hot deformation.…”

“…Twin roll casting (TRC) is a proven technology for economical production of thin aluminium sheet directly from the melt [1][2][3][4][5][6][7]. The advantages of this casting technique are numerous-reduced capital costs, energy consumption, operating costs and scrap rate compared with a conventional direct chilled (DC) casting route.…”

Modeling of macrosegregation caused by volumetric deformation in a coherent mushy zone

“…For the purpose of numerical stability, [43] a small diffusive term is introduced in Eq. [9], which is rewritten to yield [20] where . This solute conservation equation is solved in the present study by a finite-element method using a streamline upwind interpolation function in order to avoid numerical oscillations.…”

“…In both these processes, deformation imposed by rolls leads to centerline macrosegregation in the final products. [17][18][19][20][21] In aluminum direct chill casting, on the other hand, there is no externally imposed deformation. Thermally induced deformations might, however, cause dilatation/densification of the mushy zone.…”