A Phenomenological Description of Central Burst Formation During Hydrostatic Extrusion.
WATERVLIET ARSENAL N Y
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A detailed metallographic investigation of the phenomenological development of central burst defects during hydrostatic extrusion was conducted. The characteristic extrusion pressure versus billet-displacement curve of extrusions containing center burst defects was periodic each periodic segment consisted of a constant pressure part during which the extrusion velocity was slow followed by a decreasing pressure part during which the extrusion velocity was rapid. It was established that during the part of the cycle exhibiting slow billet movement, near the billet centerline beyond the end of the die deformation zone, small microcracks formed, linked-up by tensile fracture and formed a rather large cone shaped defect exhibiting little crack opening displacement. Modified author abstract
- Metallurgy and Metallography
- Fabrication Metallurgy