Enhancement of formability of aluminum alloys in multi-stage forming operations by a local intermediate heat treatment
Enhancement of formability of aluminum alloys in multi-stage forming operations by a local intermediate heat treatment
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通过局部中间热处理提高铝合金在多阶段成形操作中的成形性
DOI：
10.1007/s11740-012-0407-5
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
A. Kuppert
中科院分区：
文献类型：
--
作者：
M. Merklein;M. Lechner;A. Kuppert
本文将提出一种在多阶段成形过程中增强铝合金成形性的新方法。该技术的关键思想是在第一个成型步骤后对机械性能进行局部调整，并针对后续成型操作进行优化。机械性能的部分变化是通过两个成形步骤之间的短期热处理获得的。基于新的性能分布，二次成型过程中的材料流动得到改善，并且可以增强材料的成型性。所提出的工作涵盖了成功应用该技术的所有必要步骤。在根据预应变和热处理进行材料表征后，分析了铝合金高导热率导致的热影响区。最后通过数值模拟设计了适当的热处理布局，并通过真实的多阶段成形过程证明了成形性的增强。
Within this paper a new approach to enhance the formability of aluminum alloys in multi-stage forming processes will be presented. The technology’s key idea is the local adaption of the mechanical properties after a first forming step and their optimization for the subsequent forming operation. The partial change of the mechanical properties is obtained by a short term heat treatment between two forming steps. Based on the new property distribution the material flow during the second forming is improved and the formability of the material can be enhanced. The presented work covers all necessary steps for a successful application of the technology. After a material characterization in dependency of the pre-straining and the heat treatment, the heat affected zone, which is a result of the high heat conductivity of aluminum alloys was analyzed. In the end appropriate heat treatment layouts were designed via numerical simulation and the enhancement of formability was demonstrated with a real multi-stage forming process.