Strain hardening of steel 20 in hydrostatic extrusion

Conclusions As the result of hydrostatic extrusion, the ultimate strength of steel 20 increases from 40 kg/mm² in the original condition to 74 kg/mm² with 70% deformation. The reduction of the ductility is explained by cold working of the ferrite matrix and the oriented arrangement of pearlite colonies in the structure.Donets Physicotechnical Institute. Kommunar Mining-Metallurgical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 71–72, May, 1975.