摘要 |
<p>The method involves inserting a sheet workpiece into a molding tool at a temperature of 50 degree to 1000 degree and forming the workpiece by the tool, where retention period of the workpiece spent in the tool averages to 1 to 20 seconds. Heat is extracted from the workpiece during the retention period spent in the tool so that the workpiece leaves the tool at a temperature of 20 degree to 600 degree. Alloy elements are made of manganese, aluminum, carbon, silicon, titanium, tungsten, niobium, chromium, nickel, vanadium nitride and boron.</p> |