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May 13 - 16, 2008 |
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Extrusion/Die Practical 026 PR Extrusion Surface Effects Resulting from Billet Surface Inflow William Dixon -- QED Extrusion Developments Inc., USA The influence of billet quality on surface finish includes not only impurity content, but how the homogenization process affects favorable Fe-phase transformation. The role of billet enriched surface layer inflow is examined. The inverse segregation layer’s depth in the billet and extent of enrichment within influences extruded surface quality, as do die design and extrusion conditions’ effects on surface layer inflow. Measures to improve surface condition are presented. |
