成形温度对镁合金温热渐进成形微观组织及断口形貌的影响

A warm incremental sheet forming assisted by oil bath heating technology was proposed. The main influences of forming temperature on formability, microstructure and fracture morphology of AZ31B magnesium alloy were studied by the experimental method using related devices, and the reasons were analyzed. The results show that the higher the forming temperature of AZ31B magnesium alloy sheet is, the larger the maximum forming angle is. When the forming temperature reaches 200℃, the recrystallization partially occurs and leads to grain refinement. When the forming temperature reaches 250℃, a fully recrystallization occurs, the grain is significantly refined, and the maximum forming angle reaches 60°. While too high forming temperature increases the energy consumption as well as the oxidation degree of AZ31B magnesium alloy, and it is not the cost-optimal option. At the current experimental conditions, the oil bath heating temperature of about 250℃ is the relatively ideal forming temperature of AZ31B magnesium alloy. The non-base slip systems are activated basically and participate in the plastic deformation of the material, which improves the formability of AZ31B magnesium alloy sheet.