Strain Hardening Exponent Calculating Model for Transformation Induced Plasticity Steels

Abstract:

Based on the continuum mechanical theory and Eshelby’s inclusion theory,a representative volume element model under uniaxial tension was built.The contribution of each constitute phases and their interaction to the overall strain hardenability of TRIP steels was analyzed in detail with the method of regarding ferrites the matrix and the other constitute phases the inclusions.With the volume fraction of retained austenites as a variable,a micromechanical model calculating strainhardening exponent considering transformation induced plasticity effect was proposed.Comparison between calculated strain hardening exponent with experimental result and published data shows the proposed model can predict the strainhardening exponent of transformation induced plasticity(TRIP)steels and strainhardening exponent can change with the plastic strain and fluctuates along a parabolic path instead of constant during the whole deformation.