Warm constitutive model construction of QN1803 austenitic stainless steel
Based on the phenomenon of martensitic phase transformation during plastic deformation of QN1803 austenitic stainless steel,the physical-based Zerilli-Armstrong(Z-A)model based on the theory of thermally activated dislocation motion was proposed to construct the modified constitutive model for its warm forming.The Gleeble-3800 thermal simulator was used to perform the warm tensile test of QN1803 stainless steel under deformation conditions of the temperature of 25-200 ℃ and strain rate of 0.001-0.1s-1.Based on the test results,the warm rheological behaviors of QN1803 austenitic stainless steel was investigated,the modified Z-A constitutive model of QN1803 austenitic stainless steel was constructed and the accuracy of the model was verified.The results show that in the range of 25-100 ℃,the content of martensite in the tensile specimens decreases rapidly with the increase of strain rate.With each strain rate,the content of martensite also decreases rapidly with the increase of temperature.The correlation coefficient R and the mean absolute relative error EAR were used to quantify the accuracy of the constitutive model.The values of R and EAR of the modified consti-tutive Z-A model were 0.998 and 1.225％,respectively,which can describe the warm rheological behavior of QN1803 austenitic stain-less steel well.
QN1803 austenitic stainless steelwarm rheological behaviorZerilli-Armstrong constitutive model
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