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INFLUENCE OF PROCESS FLUCTUATIONS ON WELD SEAM PROPERTIES IN ALUMINUM ALLOY EXTRUSION

机译:过程波动对铝合金挤压焊缝性能的影响

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The quality of weld seams produced during extrusion of hollow profiles is a big issue in the extrusion industry. The presented investigations deal with the characterization of extruded weld seams for the alloys AlMgSi0.5 (EN AW-6060), AlMgSi1 (EN AW-6082) and AlZn4.5Mg1 (EN AW-7020). Mictrostructural analysis and material properties have been analyzed with respect to variations in billet temperature, extrusion speed, subsequent cooling and heat treatment. The alloys show distinct differences in recrystallization behavior and microstructure of the weld seams and the surrounding base material. The AlMgSi0.5 alloy shows a fully recrystallized microstructure while the AlZn4.5Mg1 and the AlMgSi1 exhibit different degrees of a partially recrystallized structure leading to substantial differences in grain size between the three alloys. This behavior results in a different dependency of the material properties on process parameter changes. As already stated by previous investigations, this influence is especially fatal to the material properties transverse to the extrusion direction for non- or partially recrystallizing alloys.
机译:挤出工业挤出过程中产生的焊缝质量是挤出工业中的一个大问题。所提出的调查处理合金Almgsi0.5(EN-6060),Almgsi1(EN AW-6082)和Alzn4.5mg1(EN AW-7020)的挤出焊缝对挤出焊缝的表征。已经相对于坯料温度,挤出速度,随后的冷却和热处理的变化分析了芯瘤结构分析和材料性能。该合金显示出焊缝和周围基材的重结晶行为和微观结构的不同差异。 Almgsi0.5合金显示出全重结晶的微观结构,而AlzN4.5mg1和Almgsi1表现出不同程度的部分重结晶结构,导致三种合金之间的晶粒尺寸的显着差异。此行为导致材料属性对过程参数更改的不同依赖性。如先前的研究已经陈述,这种影响对于横向于挤出方向的材料特性是非或部分重结晶合金的材料特性尤其致命。

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