RESTORATION OF WORN METALLIC EXTRUSION PROCESSING ELEMENTS

摘要

A restored metallic extrusion processing element (10") comprises a tubular metal (42) core around which is consolidated a powdered metal extrusion component (80) that includes metallurgically bonded interior shell (12) and exterior working portions (82). The interior shell portion covers the core and is characterized by a first multiple-crystalline microstructure (90), and the exterior working portion is characterized by a second multiple crystalline microstructure (92) of densified powdered metal particles. The exterior working portion has an outside surface (86) including outer working surface features (88) that extend along the length of the extrusion processing element. A bond interface (94) of metallurgical type defines a crystalline microstructure boundary between the first and second multiple-crystalline microstructures.