Empirical and physically based flow rules relevant to high speed processing of 304L steel

摘要: Thermomechanical processing of metals involves severe plastic deformation at strain rates up to 104 s-1, and temperatures the melting point. On other hand, areas far from tools may be much less or not affected by temperature. A constitutive equation valid for quasi-static 104–105 ranging room temperature point, strains about 10 is required predict accurate results. To fit experimental data, proposed models tend a steady state limit with increasing strain, whereas this fundamental characteristic reproduced most used Johnson-Cook model. Moreover, two distinct types behaviour are observed according whether dynamic recrystallization occurs not. first empirical model derived classical Voce proposed. The second physically based on mechanisms involved during discontinuous recrystallization. Coefficients fitted case 304L stainless steel.