from the conferences organized by TANGER Ltd. provisional website
The effect of preliminary heat treatment and equal channel angular pressing in step die on the microstructure and properties of steel grade 45 are analyzed. There is revealed that the grain size after equal channel angular pressing depends little on the preliminary heat treatment, however, annealing reduces the hardness of steel, which helps to reduce the effort of pressing on the first passes. Ultra-fine grained structure in steel of grade 45 is retained at heating up to 400 °C, and only at heating up to 500 °C, the recrystallized grains appear, substantially free of dislocations, with balanced triple grain junctions.Keywords: equal channel angular pressing, heat treatment, microstructure, steel grade 45.
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