Warm Extrusion of Trip Steels
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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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.
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