Constitutive Model of Wrought Superalloy GH4066 in Hot Deformation Process
To clarify the high temperature flow stress behavior and microstructures evolution of the wrought superalloy GH4066, the thermal simulation compression tests were conducted at the temperatures of 800, 900, 1000, 1100 and 1150 °C with the strain rate of 0.0003, 0.001, 0.01, 0.1, 1 and 10 s−1 on Gleeble-3800. The test results were used to construct the constitutive model of the superalloy based on the Arrhenius equation modified with the hyperbolic sine form. According to the test results, the dynamic recrystallization happened during the hot compression deformation process. The influence of temperature and strain rate on the dynamic recrystallization was analyzed in this paper, and the results were verified through the metallographic test. The comparison between the experimental and the predicted flow stress showed that the established constitutive model could well reflect the material properties of the superalloy.
KeywordsWrought superalloy GH4066 Hot deformation Material model Dynamic recrystallization
This work is sponsored by the Aviation Engine Corporation of China, Beijing Institute of Aeronautical Materials. Donation of follow-on batches of specimens by BIAM and the Test by Mechanical Engineering Department of Imperial College London is gratefully acknowledged.
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