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This study investigates the influence of F30-60-40 and F30-60-80 three-step hot forging processes on the microstructure of the Al0.35CoCrFeNi high entropy alloy. After forging, the alloy exhibited a single-phase face-centered cubic (FCC) structure. Numerical simulation of the hot forging processes was used to predict the evolution of grain formation. The simulation model was calibrated and validated using experimental compression data from the as-cast alloy, ensuring the accuracy of the model in predicting microstructural changes. During the third forging step F40 of the F30-60-40 process, a uniform distribution of dynamically recrystallized equiaxed grains with a median grain size of 64 ± 1 μm was observed. However, after the F30-60-80 forging process, dual grain size was observed in the sample, which could be attributed to the increased energy applied during the third forging step F80. The correlation between temperature, equivalent stress, equivalent plastic strain, and the resulting microstructure was analyzed. The simulations enabled the prediction of regions within the samples where dynamically recrystallized grains were formed. The study highlights the relationship between the forging process and the resulting microstructure and provides key information for optimizing the hot forging process to achieve desired material properties.
Keywords: High entropy alloy, hot forging, microstructure, numerical simulation, recrystallized grains© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.