Microstructure Evolution and Mechanical Properties of Thin Strip Twin Roll Cast (TRC) Mg Sheet

Abstract

TRC Mg alloys are hot rolled to further reduce the thickness of the TRC strip which results in a sheet material with a relatively strong basal texture which produces anisotropic tensile properties based on the test direction. The low force TRC concept developed at BCAST provides a pathway to produce thin strip that does not require further hot rolling to achieve the final desired thickness. The as TRC and homogenised AZ31 show a refined grain and very little centre line. The as TRC AZ31 has a tensile yield strength of 220 MPa along the casting direction (CD) and 190 MPa perpendicular to CD showing a very small yield anisotropy.

Analysis of Solid-Liquid Transition in Az31 Magnesium Alloy in TRC Process Using Thermocouples and Offline Digital-Twin

“…The advantage of the continuous casting process is the combination of solidification and forming in one process step, which results in a formed casting structure [1]. This favours the subsequent behavior of the SRX (explain SRX) and thus the mechanical properties during further rolling [2][3][4][5][6]. However, due to the very large number of input variables in the process, it is very sensitive to fluctuations in the individual output variables.…”

“…Therefore, in order to control them accurately, it is necessary to use sensors, which measure additional measuring signals, as well as process models, which enable simulation of the process using the same parameters [7][8]. So far, process models have been used for a basic understanding of what processes occur in the rolling gap and how the crystallization front proceeds [9][10][11]. For this purpose, the model developed in [8] was used.…”