Hot working behaviour and processing maps of duplex cast steel

Abstract In this paper the hot working behaviour of medium carbon duplex cast steel is studied using uniaxial compression tests over a temperature range varying from 700 ?C to 1 000 °C and at different strain rates ranging 10– 4 10 –1 s . A model based on variant dynamic materials was employed construct processing maps. These maps delineate safe unsafe domains. The domains, associated with recrystallization recovery, can be chosen optimize workability material. Whereas, domain avoided because it plastic deformation instabilities. centred 1000 –4 peak energy dissipation efficiency about 40%, while recovery 27%. domain, spread entire moderate high rates, predicts appearance flow instabilities, in form shear bands intergranular cracks. To validate obtained results, microstructural observations corresponding conditions are presented.