Effect of V Bending Conditions on Cracking of Flame-resistant Magnesium Alloy Sheet

Abstract

In this study, we investigated the influence of various bending conditions on cracks and microstructures during the V bending test. The AZX811 alloy used in this research was in the form of two kinds of sheets: high-strength large-elongation rolled sheets and static recrystallization sheet (annealed at 450 °C for 2h). Under the V bending test conditions, the processing temperature was changed from room temperature to 300 °C. The ratio (R/t) of the punch radius R to the sheet thickness t was 1 to 3. During the bending test, cracks occurred outside the punch subjected to tensile stress. Under the condition of R/t = 1, it was possible to bend the static recrystallized sheet at 300 °C and the rolled sheet at 200 °C. It is considered that in the rolled sheet, in which strain remains, dynamic recrystallization occurs at lower temperatures than in the static recrystallized sheet.