Určení disipace energie a tvorba procesních map z výsledků krutových zkoušek

Abstract

The object of this diploma work is to analyze the results of torsion tests, compute the strain rate sensitivity parameter and then construct processing maps. There are theory of these maps and their basics explained in the first part, in the second part the experiment is presented. The materials of the specimens used were CSN 11 523 construction steel, P91 (9Cr-1Mo) anticorrosion steel and Ms70 (CuZn30) brass. The specimens’ diameter is 6 mm and the length is 10 mm (deformed with high strain rate), 50 mm for low strain rates. I drew from the theory of dynamic material model (DMM) and the theories of Prasad. Using computer software I computed the parameters needed for construction of processing maps (strain rate sensitivity, parameter of microstructural instability and efficiency of power dissipation). The final processing map, which consists of a power dissipation map and an instability map, determines the scales of temperature, strain and strain rate that are most acceptable for the best production effectiveness.