Warm Extrusion of Trip Steels
Abstract
TRIP steel rods were warm extruded to reductions of area of 40%, 60%, and 80%. Temperature increases on the order of 300 F were compensated for by selecting a lower initial billet temperature than the optimum of 850 F used for warm rolling. The billet preheat temperature was selected to produce a maximum extrusion temperature (at the die exit) of 850 F. The 40% and 60% reductions were each performed in one extrusion pass. The 80% reduction required a two-step sequence (60% followed by 50%). This procedure was necessary to avoid the excessively low preheat temperature required for a single reduction to 80%. The extrusion constants are approximately 50 ksi for hot extrusion, 150 ksi for single-pass warm extrusion, and 300 ksi for the second (50%) warm reduction. With the procedures established, the material was successfully extruded to hardness levels equivalent to those obtained by warm rolling.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1976
- Accession Number
- ADA022710
Entities
People
- James R. Douglas
- Morris Azrin
- Roger A. Gagne
Organizations
- United States Army Research Laboratory