(哈尔滨工业大学(威海) 材料科学与工程学院，威海 264209)
摘 要: 对板厚1.0 mm的细晶AZ31B镁合金板材进行快速气压胀形研究，在300~400 ℃的温度范围内进行了各种气压下300 s的快速气压胀形试验，研究温度和气压对AZ31B板材快速气压胀形能力的影响。结果表明：在不同温度下，胀形高度均随着气压的升高而增大，但气压升高到一定程度时，胀形时间不到300 s即产生破裂；胀形高度在胀形温度400 ℃时出现峰值为45 mm。在400 ℃和0.6 MPa条件下，胀形5 min时相对胀形高度达到1.13。胀形件壁厚分布不均匀，温度越高，壁厚分布不均匀度越高。最后，研究了不同温度下快速气压胀形时胀形件微观组织的演变规律。
关键字: AZ31B镁合金板；快速气压胀形；壁厚分布；组织演变
（College of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China）
Abstract:QGBF behavior for AZ31B magnesium alloy sheet with 1.0 mm thick was studied. Half-sphere free gas bulging tests were performed at 300−400 ℃ for 300 s duration to study the effects of temperature and gas pressure on QGBF properties of AZ31B sheet. The results show that the bulging height increases with the gas pressure increasing at different temperatures, however, the bulging parts crack within 300 s when the forming temperature exceeds the threshold. And the bulging height exists peak value at 400 ℃ reaches 45 mm and the highest specific height can reach 1.13 under the condition of 400 ℃ and 0.6 MPa for 5 min duration. The thickness distribution of bulging parts is uniform, and the higher the temperature, the larger the unevenness of thickness distribution. Furthermore, the microstructure revolution in the quick gas blowing process was discussed by observing the microstructure at different temperatures.
Key words: AZ31B magnesium alloy sheet; quick gas blow forming; thickness distribution; microstructure evolution
