High temperature deformation behavior of DP1 180 steel
In order to optimize the hot deformation process of DP1 180 steel,the high temperature compression test of DP1180 steel was carried out by Gleeble-3800 thermal simulation testing machine under the conditions of deforma-tion temperature of 850-1 100 ℃ and strain rate of 0.1-10.0 s-1.The true stress-ture strain curve of the steel was obtained,and the influence of deformation temperature and strain rate was analyzed.The deformation resistance model suitable for the steel was established and modified by the existing model,and the hot processing maps under different strain were drawn according to the true stress-ture strain curve.Experiments show that the increase of temperature and the decrease of strain rate will make the true stress smaller,and dynamic recrystallization are more likely to occur.The deformation resistance model established by Origin,the fitting curve is basically consistent with the measured value,and the accuracy of the error analysis model is high,but its scope of application still has some limitations.By drawing the hot processing map,it is found that there are almost few rheological instability zones in the hot processing map under the experimental conditions.The best theoretical thermal processing area is the strain rate of 1.0-10.0 s-1,and the deformation temperature is controlled at 1 050-1 100 ℃.The research results provide experi-mental basis and theoretical guidance for the optimization design of hot deformation process of DP1 180 steel.
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