Abstract

1. The processes of the polygonization and subsequent recrystallization of the α-phase occur during tempering of the steel; this leads to a sharp drop in the semibrittleness temperature T50, to an increase in the metal's density, and to a significant weakening of the intergrain texture. 2. The polygonization process is slowed in the presence of an overheat structure (more heavily alloyed α-phase) and is associated with the carbide transformation. Orientation along the bainite plates is disturbed as a result of the carbide transformation. 3. An increase in the duration of tempering to 100 h leads to recrystallization of the α-phase. This causes a reduction in the impact strength, and an increase in T50. 4. It is necessary to consider the polygonization and recrystallization of the α-phase in specifying heat-treatment regimes for heavy-duty forgings:

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