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      Hot deformation and constitutive model of as-cast Ni–Cr–Co nickel-base alloy

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          Abstract

          Nickel-based superalloys are widely used in thermal power, nuclear power, aerospace and other fields due to their excellent properties. Since the deformation resistance of Ni–Cr–Co superalloy is large and the forming range is narrow, the hot deformation behavior of Ni–Cr–Co superalloy was studied by hot compression experiments on a Gleeble-3800 under different deformation conditions (deformation temperature: 950–1200 °C, strain rate: 0.01–10 s −1, and deformation: 60 %). The modified Johnson–Cook, modified Zerilli–Armstrong and strain compensated Arrhenius models were constructed based on the stress–strain curves corrected for friction and temperature. The correlation coefficient ( R) and average absolute relative error ( AARE) were compared to verify the accuracy of the model. The results showed that the strain compensated Arrhenius model had high accuracy, the modified Zerilli–Armstrong had high accuracy in predicting the flow behavior above 1100 °C, while the modified Johnson cook had high accuracy only under the reference conditions. Electron back-scattered diffraction analysis showed that high-angle grain boundaries formed when the low-angle grain boundaries piled up to a certain extent, which is beneficial for refining the as-cast microstructure, and the increase in strain rate was beneficial for refining the microstructure and promoting the occurrence of recrystallization.

          Most cited references37

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          On the mechanism of hot deformation

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            A comparative study on Johnson Cook, modified Zerilli–Armstrong and Arrhenius-type constitutive models to predict elevated temperature flow behaviour in modified 9Cr–1Mo steel

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              A modified Johnson–Cook model for tensile behaviors of typical high-strength alloy steel

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                Author and article information

                Journal
                International Journal of Materials Research
                Walter de Gruyter GmbH
                1862-5282
                2195-8556
                October 11 2022
                October 11 2022
                : 0
                : 0
                Affiliations
                [1 ]School of Materials Science and Engineering , Taiyuan University of Science and Technology , Taiyuan 030024 , P. R. China
                [2 ]Coordinative Innovation Center of Taiyuan Heavy Machinery Equipment , Taiyuan University of Science and Technology , Taiyuan 030024 , P. R. China
                [3 ]Shanxi Modern Rolling Engineering Technology Research Center , Taiyuan University of Science and Technology , Taiyuan 030024 , P. R. China
                Article
                10.1515/ijmr-2021-8716
                4bfef921-af67-451e-9c5b-5242b33cb82c
                © 2022
                History

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