Accession Number : AD0755832

Title :   The Influence of the Interface Condition on the Plastic Deformation Zone and the Resultant Product Integrity in Extrusion.

Descriptive Note : Technical rept. 1 Feb 71-15 Apr 72,

Corporate Author : WESTINGHOUSE ELECTRIC CORP PITTSBURGH PA ASTRONUCLEAR LAB

Personal Author(s) : Gurney,F. J. ; De Pierre,V.

Report Date : OCT 1972

Pagination or Media Count : 24

Abstract : The effect of the tooling-workpiece interface condition on the metal flow in extrusion is shown to be of critical importance in the achievement of sound product. For 2:1 reduction ratio extrusions, the central burst defect is shown to occur when low frictional restraint interfaces are employed. Sound internal product is shown to occur when high frictional restraint interfaces are employed. In metal alloy powder compaction-extrusion processes, a low density core is shown to be associated with compaction at low extrusion ratio employing low frictional restraint interfaces. The experimental results are discussed in terms of recent theoretical analyses of metalworking processes which are based on the effect of the interface friction influencing the volume of the plastic deformation zone and the subsequent strain rate fields. (Author)

Descriptors :   (*POWDER METALLURGY, EXTRUSION), (*EXTRUSION, INTERFACES), CREEP, DEFECTS(MATERIALS), SURFACES, QUALITY CONTROL, FRICTION, ALUMINUM ALLOYS, SILICON ALLOYS, STRAIN(MECHANICS)

Subject Categories : Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE