Determination of energy dissipation and process instability in various alloys on the basis of plastometric tests

Energy dissipation and areas of process instability were investigated in two alloys. The first 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.