Abstract
1. High-speed steel R18 as-cast, with a fine crystalline structure, has, under all conditions, rates and temperatures of deformation, a ductility consderably lower than that for the wrought steel. 2. The cast steel is sensitive to the deformation rate. With static compression it is more ductile than with dynamic compression. At 800–1250° eCst/Cdyn. The wrought steel is less sensitive to the deformation rate. 3. The ductility in tension, compression, and torsion, and also the impact toughness, reach their highest values at temperatures 50–100° higher for the cast steel than for the wrought steel. 4. Heating of cast steel R18 before pressing and heat treatment at 20–800° and cooling from 800 to 20°, and also at 20 to 500° and 500 to 20° for the wrought steel, should be slow.
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