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Influencing the gradient of material properties by gradation extrusion

: Bergmann, Markus; Sterzing, Andreas; Landgrebe, Dirk


Wulfsberg, J.P.:
Progress in Production Engineering : Selected, peer reviewed papers from the 2015 WGP Congress, September 7-8, 2015, Hamburg, Germany
Dürnten: Trans Tech Publications, 2015 (Applied mechanics and materials 794)
ISBN: 978-3-03835-616-5 (Print)
ISBN: 978-3-03859-410-9 (CD-ROM)
ISBN: 978-3-0357-0095-4 (eBook)
Wissenschaftliche Gesellschaft für Produktionstechnik (WGP Congress) <5, 2015, Hamburg>
Fraunhofer IWU ()
forming; metal; severe plastic deformation

Designing material characteristics by grain refinement using Severe Plastic Deformation (SPD) is an attractive way to create outstanding material properties. This paper presents a unique method which combines SPD and impact extrusion. The extrusion die is designed to create additional material deformation to a defined depth, resulting in a gradient from ultra-fine grained to coarse grained microstructure. Due to the large gradient the method is called gradation extrusion. The paper presents a new analytical calculation method and a numerical evaluation of the strain, showing the relationship between tool design and achievable effects and provides initial experimental results.