Influence Of Temperatures And Strain Rates On Tensile Deformation Behaviour Of DP 590 Steel

Abstract In this study, tensile deformation behaviour and material properties has been investigated at different temperatures and strain rates. The isothermal uniaxial tensile tests were conducted from room temperature to 700°C at an interval of 100°C at different quasi-static strain rates (0.01, 0.001, 0.0001 s-1). The flow stress is significantly influenced by temperature and strain rate change. Various important material properties namely: yield strength (σy), ultimate tensile strength (σut), % elongation and strain hardening exponent (n) are determined at different temperatures and strain rates. In order to understand the fracture behaviour of a DP steel, microstructural characteristics were studied using Scanning Electron Microscope (SEM). Predominately ductile failure has been reported at higher temperatures. The individual phases (ferrite + martensite) play an important role in defining the ultimate failure mode in tensile testing.