Comparison of modified J-C constitutive relation model and strain compensated Arrhenius constitutive relation model of GH738 superalloy
Isothermal constant strain rate compression experiments were conducted on GH738 superalloy under the conditions of deformation temperatures of 980-1100 ℃,strain rates of 0.001-0.1 s,and height compression rates of 60％.The flow stress behavior of the alloy was studied,and the flow stress constitutive relationships of the alloy were constructed using the J-C model and the Arrhenius model,respectively.The results show that both the modified J-C model and the strain compensated Arrhenius model can accurately characterize the flow stress behavior of the GH738 superalloy and predict its flow stress.The correlation coefficient r of the modified J-C constitutive relation model is 0.99172,and the average absolute relative error AARE is 7.86％.The correlation coefficient r of the strain compensated Arrhenius constitutive relation model is 0.98815,and the average absolute relative error AARE is about 7.46％.The two constitutive relation models have similar overall prediction accuracy,but there are certain differences in prediction accuracy under different deformation conditions.When the strain rate is high,the deformation temperature is low,and the strain is small,it is advisable to choose the modified J-C constitutive relation model.On the contrary,it is advisable to choose the strain compensated Arrhenius constitutive relation model.
GH738 superalloyhot deformation behaviorJ-C modelArrhenius model
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