Extrusion of Aluminum Tubes with Axially Graded Wall Thickness and Mechanical Characterization
Extrusion of Aluminum Tubes with Axially Graded Wall Thickness and Mechanical Characterization
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DOI：
10.1016/j.procir.2014.06.098
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Negendank;S. Müller;W. Reimers
中科院分区：
文献类型：
--
作者：
M. Negendank;S. Müller;W. Reimers
研究了变壁厚无缝铝管的间接挤压成形工艺.因此，应用了可轴向移动的阶梯式心轴。研究表明，壁厚过渡可以在管长度上分级或非常尖锐。研究了薄壁管和厚壁管截面的微观组织。在TB=400 °C时，由于挤压比的局部变化，以及挤压过程中管壁厚度、产品速度和产品温度的局部变化，导致局部微观结构显著不同。在TB=500 °C下，在所有不同的管段中，显微组织均匀地再结晶，具有相似的晶粒尺寸。此外，通过三点弯曲试验来表征管的机械性能。
In this study the indirect extrusion of seamless aluminum tubes with variable wall thickness was investigated. Therefore, an axially moveable stepped mandrel was applied. Investigations revealed that wall thickness transitions can either be graded over the tube length or very sharp. The microstructures in thin-walled and thick-walled tube sections were investigated. The local variation of the extrusion ratio and with that the tube wall thickness, product velocity and product temperature during the process lead to significantly different local microstructures at TB=400 °C. At TB=500 °C the microstructure was homogeneously recrystallized with similar grain size in all different tube sections. Furthermore, the mechanical tube properties were characterized by three point bending tests.