Tensile Behavior, Constitutive Model, and Deformation Mechanisms of MarBN Steel at Various Temperatures and Strain Rates

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Abstract
To reduce harmful gas emission and improve the operational efficiency, advanced ultra-supercritical power plants put forward higher requirements on the high temperature mechanical properties of applied materials. In this paper, the tensile behavior and deformation mechanisms of MarBN steel are discussed at different strain rates (5 × 10−3 s−1, 5 × 10−4 s−1, and 5 × 10−5 s−1) under room temperature and 630 °C. The results show that the tensile behavior of the alloy is dependent on temperature and strain rate, which derived from the balance between the average dislocation velocity and dislocation density. Furthermore, observed dynamic recrystallized grains under severe deformation reveal the existence of dynamic recovery at 630 °C, which increases the elongation compared to room temperature. Finally, three typical constitutive equations are used to quantitatively describe the tensile deformation behavior of MarBN steel under different strain rates and temperatures. Meanwhile, the constitutive model of flow stress for MarBN steel is developed based on the hyperbolic sine law.
Funding Information
  • the National Natural Science Research Funds of China (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2019CDZG-4, DECSKL202102)
  • the National Postdoctoral funds of China (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2019CDZG-4, DECSKL202102)
  • the National Key R & D Program (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2019CDZG-4, DECSKL202102)
  • the Applied Basic Research Programs of Sichuan Province (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2019CDZG-4, DECSKL202102)
  • the Sichuan University and ZiGong Government Support Program (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2019CDZG-4, DECSKL202102)
  • the International Visiting Program for Excellent Young Scholars of SCU (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2019CDZG-4, DECSKL202102)
  • the fund of the State Key Laboratory of Long-Life High-Temperature Materials (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2019CDZG-4, DECSKL202102)

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