PHYSICAL MODELLING OF THE PLASTIC WORKING PROCESSES OF ZIRCONIUM ALLOY BARS AND TUBES IN THERMOMECHANICAL CONDITIONS

摘要

The article presents results of physical modelling of processes of plastic working of the modified Zr-1% Nb zirconium alloy, obtained using different methods of the plastometric testing. The "Gleeble 3800" metallurgical process simulator, a DIL805 A/D dilatometer with a plastometric attachment, and a "Setaram" plastometer were used for testing. Based on the obtained testing results, the values of the yield stress and limiting plasticity of the tested alloy were determined for wide ranges of temperature variation ( T = 20 divided by 950 degrees C) and strain rate variation (<(epsilon) over dot> = 0.1 divided by 15.0 s(-1)) under continuous loading conditions. It was found that by using different testing methods, different alloy properties, characteristic for a given plastic working process, could be obtained.