Abstract
The uniaxial tension tests of 1500MPa boron steel at strain rates of 0.01-5.0 s-1 and temperatures of 550-850°C were performed. Considering the difference between the deformation necking cross section and the centre measuring section of specimen, a correction method of measuring strain and temperature at necking cross section are developed. For the method, the deformation of necking cross section was obtained which approximate for the trapezoidal change law near the necking zone. The stress strain curves are corrected based on the correction method of the strain and by considering temperature correction. A set of unified constitutive equations has been developed and calibrated. Correlation between the corrected and predicted true stress data from the constitutive equation is presented. The correlation coefficient is 0.969, and the absolute average relative error is 3.73% in the range of allowable experimental conditions.
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