Magnesium Twin-Roll Casting Technology for Flat and Long Products - State of the Art and Future

Abstract

Due to their advantageous strength-weight ratio, good recyclability, excellent noise and vibration damping properties as well as excellent dent resistance, magnesium materials offer a variety of uses in modern lightweight structures. As a result, a comeback of magnesium alloys is to be seen in multiple industrial applications, especially in the automotive industry, as the potential for lightweight, cost-effective lightweight industrial construction associated with the lightest metallic engineering material helps to meet even stricter energy and environmental efficiency guidelines. Traditionally, casting processes have been the dominant magnesium manufacturing processes, but in the last decade, an increasing number of lightweight structural applications have been implemented with magnesium wrought alloys. In this paper, the current state of developments focusing the twin-roll casting (TRC) of semi-finished products of magnesium alloys will be presented. By reducing the number of process steps in combination with a unique microstructure, the near-net-shape TRC process offers new options to provide magnesium materials meeting current and future requirements for semi-finished products, constructions and moldings in terms of type, quantity and quality.

Extension of the Freiberg Layer Model by Means of Solidification for Roll Casting

“…eq , ϑÞ ¼ Ae m 1 ϑ ϑ m 9 φ m 2 eq e m 4 =φ eq ð1 þ φ eq Þ m 5 ϑþm 6 e m 7 φ eq φ : m 3 þm 8 ϑ eq (19) At this point, one difference to the configuration in Miehe [35] should be noticed. There were used temperature-dependent curves of heat capacity c p and heat conductivity λ.…”

“…The melt is solidifying within the roll gap, and the solid metal is then immediately deformed before the exit of the roll gap. There have been several publications in the past, for example, Ullmann et al, [16] Ullmann, [17] Schmidt, [18] Kawalla et al, [19,20] Kittner et al, [21] Miehe and Gross, [22] Moses et al, [23] and Neh et al [24] DOI: 10.1002/adem.202101546 Finite element method (FEM) simulations offer deep and detailed modeling of complex processes, but with a high effort of computation power and time. For the special purpose of flat rolling, a layer model is developed by Schmidtchen earlier based on the classic elementary theory of plasticity with the purpose to model inhomogeneous behavior with a significant lower effort at computation.…”

“…The melt is solidifying within the roll gap, and the solid metal is then immediately deformed before the exit of the roll gap. There have been several publications in the past, for example, Ullmann et al, [ 16 ] Ullmann, [ 17 ] Schmidt, [ 18 ] Kawalla et al, [ 19,20 ] Kittner et al, [ 21 ] Miehe and Gross, [ 22 ] Moses et al, [ 23 ] and Neh et al [ 24 ]…”

GTN Model-Based Material Parameters of AZ31 Magnesium Sheet at Various Temperatures by Means of SEM In-Situ Testing

“…The chemical composition of the investigated alloy is presented in Table 1. A description of the manufacturing process and the expected final properties of the test material can be found in numerous publications [23][24][25][26][27][28]. First, rough outlines of the tensile specimens were cut from the sheet via waterjet cutting.…”

Twin-Roll-Casting Technology for the Magnesium Strip

“…Important alloys in this regard are WE43 [9] and, most recently, WZ73 [10,11]. In addition, investigations were carried out with the calcium-containing alloys MX21 and ZAX210 [12][13][14]. In contrast to AZ31, these alloys do not weakened texture and thus improved formability.…”