Zhang Haoran, Chu Xingrong, Lin Shuxia, Bai Huawei, Sun Jiao
Associated Engineering Research Center of Mechanics and Mechatronic Equipment, Shandong University, Weihai 264209, China.
Materials (Basel). 2021 Feb 8;14(4):810. doi: 10.3390/ma14040810.
The straight groove test of AZ31B magnesium alloy sheet by electric hot temperature-controlled incremental sheet forming (ISF) was conducted at different temperatures. The temperature influence on fracture depth, deformation force and strain distribution was investigated. It was found that the limit depth and major strain increased as the temperature rose and that the forming force decreased correspondingly. Furthermore, the fracture behavior changed from brittle fracture to ductile fracture. Considering the formability and surface wear comprehensively, the optimized forming temperature was determined to be 300 °C. The microstructure of the groove specimen was analyzed and the dynamic recrystallization (DRX) was considered to be the reason for the improved formability. The degree of DRX depended on the temperature and degree of deformation, which resulted in non-uniform distribution of hardness within the cross section of the groove specimen.
采用电热控温渐进式板材成形（ISF）工艺对AZ31B镁合金板材进行了不同温度下的直槽试验。研究了温度对断裂深度、变形力和应变分布的影响。结果表明，随着温度升高，极限深度和主应变增大，成形力相应减小。此外，断裂行为从脆性断裂转变为韧性断裂。综合考虑成形性和表面磨损，确定优化的成形温度为300℃。对槽形试样的微观组织进行了分析，认为动态再结晶（DRX）是成形性提高的原因。DRX程度取决于温度和变形程度，这导致槽形试样横截面上硬度分布不均匀。
