Effect of Sample Geometry on Strain Uniformity and Double Hit Compression Tests for Softening Kinetics Determination

Static softening is an essential process during the hot rolling of steel to refine grain size and improve mechanical properties. The double hit test used measure static volume fraction from flow stress curves. Herein, influence different sample geometries on determination for conditions where 0–99% expected. tests are modeled in DEFORM conventional both uniaxial compression standard plane strain tests, additional simulation a modified geometry, designed provide more uniform distributions, also performed. A user routine incorporated into model predict localized based known equations set back value zero while reaches 85%. geometry shows strong gradient resulting inaccurate predictions stress, whereas show better data.