Determination of Energy Dissipation and Process Instability in Various Alloys on the Basis of Plastometric Tests

T. Kubina, J. Kliber, L. Kunčická, M. Berková, J. Horsinka, VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic J. Bořuta, Material & Metallurgical Research, Ltd., Ostrava, Czech Republic Energy dissipation and areas of process instability were investigated in two alloys. The fi rst one was brass, the second one was the steel 9 Cr (P91). The tests were performed on torsion plastometer Setaram and on compression plastometer Gleeble. In the case of the steel 9 Cr identical heat was tested on both plastometers. The resulting 2D or 3D process maps indicate suitable areas of forming temperatures, magnitudes of deformation and strain rates.