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By A Erman Tekkaya; Nooman Ben Khalifa

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Read or Download Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009 PDF

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Additional info for Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009

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The specimen was analyzed in three directions, twice along the axis and once transversely to it. For this, it was ground polished up to 2400 silicon carbide grinding paper, electro polished with an acid composed of 78 ml perchloric acid, 90 ml H2O, 730 ml ethanol and 100 ml butoxy ethanol (10 sec at 26 V), and etched in a Barker’s reagent [12] (90 sec at 20V). For electro polishing and etching, the LectroPol-5 machine of Struers was used. As an electrical contact is required for electro polishing, the specimen must be well prepared.

9°C) and (b) strain rate distribution near the die radius. The high change of the zz stress tensor component in the meridian cross section, from – 223 MPa to 28 MPa, indicates the noncontinual stress distributions in the deformation zone (Fig. 3a). The Von Mises equivalent stress range in the materials structure from 3 MPa to 67 MPa near the edge of the die describes the aluminium loading during the process. 8 MPa) the stress conditions in the forming zone can be explained. (a) (b) Fig. 3: Field of characteristic stresses in the deformation zone: (a) Distribution of zz stress tensor and (b) distribution of Von Mises stress.

2: Overview: Cross section polish of the specimen (EN AW-7020) Fig. 3: Overview: Cross section polish of the specimen (EN AW-7020) Fig. 4: Micrograph of the strand (EN AW-7020) Key Engineering Materials Vol. 424 39 Simulation. The internal variables like strain, strain rate and temperature were calculated in DEFORM 3D. The container, the die, and the ram were modeled as rigid bodies in the simulation. A rigid-plastic material was assigned for the plastic flow behavior of the billet. Tetrahedron elements were used and remeshing was active.

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