METHOD OF OBTAINING VOLUMETRIC BLANKS OF HIGH-MANGANESE STEEL WITH RECRYSTALLIZED FINE-GRAINED STRUCTURE Russian patent published in 2019 - IPC C21D8/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly, to production of blanks from high-manganese steels of austenitic class with fine-grained structure used in production of power elements of car body. Method involves homogenization annealing at temperature of 1423 K for 1 hour and hot deformation-thermal treatment. Said treatment is carried out by hot rolling of billet to deformation degree 1 at temperature of 1423 K and subsequent thermomechanical treatment by forging at constant temperature from range of 1073 to 1273 K with true degree of deformation of not less than 1 at constant deformation rate in range from 10^-2 up to 10^-4 s^-1 followed by instant quenching into water.

EFFECT: method enables to obtain a homogeneous dynamically recrystallized fine-grained structure in bulk billets of high-manganese austenitic steels with a unique combination of high strength and plasticity, the product of which σ_B×δ is not less than 49 000 MPa×%.

1 cl, 2 dwg, 1 tbl, 2 ex