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首页> 外文期刊>Journal of Materials Engineering and Performance >Study on the Formability and Deformation Behavior of AZ31B Tube at Elevated Temperature by Tube Bulging Test
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Study on the Formability and Deformation Behavior of AZ31B Tube at Elevated Temperature by Tube Bulging Test

机译：鼓胀试验研究高温下AZ31B管的可成形性和变形行为

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摘要

Internal high pressure forming of tube is widely used to form complex tubular part with different cross sections and curved axis. The ability of tube to undergo expansion deformation is crucial for the forming process. To evaluate the formability of AZ31B extruded tube, bulging test was carried out at different temperatures from RT up to 480℃. Bursting pressure and maximum expansion ratio (MER) of the tube were obtained. The fracture surface after bursting was analyzed and compared with that obtained by tensile test along axial direction. Hardness changes in different positions along axial direction were also measured. Results show that the MER value remain almost unchanged from RT to 100℃. In the temperature interval between 100 and 480℃, an oblique N model can be used to describe the variation of MER value. The first peak and the bottom MER value occurred at 160 and 330℃, respectively, and about 30.3% expansion ratio was reached at 480℃. The bursting pressure decreased almost linearly as testing temperature increased. The fracture mode also changed from intercrystalline fracture to gliding fracture. However, burnt structure happened when the forming temperature was about 480℃. The hardness value of the tube decreased significantly after the bulging test.
机译：管的内部高压成型被广泛用于形成具有不同横截面和弯曲轴的复杂管状部件。管子发生膨胀变形的能力对于成型过程至关重要。为了评估AZ31B挤塑管的可成形性，在室温至480℃的不同温度下进行了膨胀试验。获得管的破裂压力和最大膨胀率（MER）。对破裂后的断裂面进行分析，并与沿轴向的拉伸试验得到的断裂面进行比较。还测量了沿轴向不同位置的硬度变化。结果表明，从室温到100℃，MER值几乎保持不变。在100到480℃的温度区间内，可以用斜N模型来描述MER值的变化。第一个峰值和最低的MER值分别出现在160和330℃，并且在480℃达到约30.3％的膨胀率。随着测试温度的升高，爆裂压力几乎呈线性下降。断裂模式也从晶间断裂变为滑动断裂。但是，当成形温度在480℃左右时，会发生烧成组织。鼓胀试验后，管的硬度值显着降低。

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