Analysis of the Tensile Deformation Behaviors and Microstructure Characterization under Various Temperatures of MarBN Steel by EBSD

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Abstract
The uniaxial tensile behavior of MarBN steel with a constant strain rate of 5 × 10−5 s−1 under various temperatures ranging from room temperature to 630 °C was analyzed. This study aimed to identify the effect of the temperature on the tensile behavior and to understand the microstructure deformation by electron backscatter diffraction. The tensile results showed that the yield and ultimate tensile strength decreased with increasing temperature. Serrated flow was observed from 430 °C to 630 °C. The electron backscatter diffraction analysis showed that the low-angle grain boundaries decreased at the medium deformation and increased at the maximum deformation. In contrast, they decreased with increasing temperatures. In addition, the number of voids increased with the increasing plastic strain. As the strain increased, the voids joined together, and the tiny cracks became larger and failed. Three mechanisms were responsible for the tensile deformation failure at various temperatures: grain rotation, the formation and rearrangement of low angle grain boundaries, and void nucleation and propagation. Finally, the formation of the low-angle grain boundaries and voids under different degrees of deformation is discussed.
Funding Information
  • National Natural Science Research Funds of China (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2022JDJQ0011, DECSKL202102)
  • National postdoctoral funds of China (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2022JDJQ0011, DECSKL202102)
  • National Key R & D Program (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2022JDJQ0011, DECSKL202102)
  • Applied Basic Research Programs of Sichuan Province (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2022JDJQ0011, DECSKL202102)
  • State Key Laboratory of Long-Life High-Temperature Materials (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2022JDJQ0011, DECSKL202102)
  • Fundamental Research Funds for the Central Universities (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2022JDJQ0011, DECSKL202102)
  • International Visiting Program for Excellent Young Scholars of SCU (12272245, 11832007, 12172238, 2019M653396, 2018YFE0307104, 2022NSFSC0324, 2022JDJQ0011, DECSKL202102)

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