Authors: Bach, F. W.
Kleiner, M.
Risch, D.
Walden, L.
Title: Effects of Electromagnetic and Hydraulic Forming Processes on the Microstructure of the Material
Language (ISO): en
Abstract: Over the past few years, various papers have been published in the field of high speed forming processes. The focus was mainly on the technological aspects of metal forming, however. Therefore, the present contribution puts an emphasis on transmission electron microscopy analyses. The present research work describes the effects of the two forming processes upon the aluminum microstructure and their influence on the material properties. The objective is to characterise the micro processes determining the plastic deformation with both forming velocities the electromagnetic high speed forming process with strain rates of 10,000 s^(-1) and the bulge test, having deformation rates of less than 0.1 s^(-1) as a quasistatic process. In this article sheet metals out of technical pure aluminum 99.5% with a thickness of 1 mm were investigated. To this end, sample specimens were taken from manufactured workpieces along the radius at various distances from the center. Because of the similarity of the forming paths, two places on the specimens manufactured at different forming rates were evaluated and compared to each other: immediately next to the blankholder and from the area of maximum strain. Metallographic tests of the structures, the sheet thickness, and the micro hardness distribution of the initial state and the formed sheet metals were executed in advance.
Subject Headings: bulge test
dislocation
electromagnetic sheet metal forming
microstructure
URI: http://hdl.handle.net/2003/27050
http://dx.doi.org/10.17877/DE290R-12971
Issue Date: 2004
Publisher: Institut für Umformtechnik - Technische Universität Dortmund
Is part of: 1st International Conference on High Speed Forming, March 31, April 1, 2004, Dortmund, Germany
Appears in Collections:High Speed Forming 2004

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