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为测试AZ31B挤压管材的内高压成形性能,分别进行管材环向拉伸实验和管材胀形实验,实验温度最高达480°C。通过实验获得管材的环向总延伸率和最大胀形率,同时对胀破后的断口形貌进行分析。结果表明,随着实验温度的变化,环向总延伸率和最大胀形率的变化趋势类似,而和轴向总延伸率的变化趋势差别很大。在160°C左右,环向总延伸率和最大胀形率都达到一个极值,此后两者迅速降低。当达到转变温度后,环向总延伸率和最大胀形率又开始迅速增加。当实验温度超过420°C时,在断口上出现过烧组织。因此,尽管在更高的温度下可以获得更好的成形性能,所测试管材的成形温度还是应低于420°C。
In order to test the internal high pressure forming performance of AZ31B extruded pipe, the pipe circumferential tensile test and the pipe bulging test were carried out respectively. The experimental temperature was up to 480 ° C. Through the experiment, the total circumferential extension rate and the maximum bulging rate of the pipe were obtained, and the fracture morphology after the burst was analyzed. The results show that with the change of the experimental temperature, the change trend of the total circumferential extension ratio and the maximum bulging ratio is similar, but the trend of the total axial extension ratio varies greatly. Around 160 ° C, both the total circumferential extension and the maximum bulging reached an extreme, after which both decreased rapidly. When the transition temperature is reached, the total circumferential extension and maximum bulging rate begin to increase rapidly. When the experimental temperature exceeds 420 ° C, the burned tissue appears on the fracture. Therefore, the forming temperature of the tested pipe should be lower than 420 ° C, though better formability can be obtained at higher temperatures.