Abstract
1. The high strength of austenite (σb and σ0.2) resulting from preliminary hot deformation depends on the total contributions to strengthening of the subboundaries, the high density of free dislocations, and the reduction in the grain size resulting from partial or complete dynamic or static recrystallization. 2. The formation of a polygonized substructure as the result of hot deformation leads to a change in the susceptibility of austenite to strain hardening — higher resistance to plastic deformation (σ0.2), lower rate of strain hardening in the even-deformation section (increase of ductility) with retention of higher resistance to substantial plastic flow up until failure.
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