Principles of processing of an ultrafine-grained structure in large - section billets

Summarizing the results of the studies performed at IMSP RAS, the principles of processing of a uniform ultrafine-grained (UFG) structure in large-section billets by means of the technique of multiple isothermal forging are formulated. These principles imply a uniform introduction of plastic strain energy into large-section billets, minimization of contact friction between the die-set and the billets, and deformation processing in the temperature and strain-rate conditions that are most favourable for the development of dynamic recrystallization.