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A piecewise constitutive model, microstructure and fracture mechanism of a nickel-based superalloy 750H during high-temperature tensile deformation

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Abstract

In order to understand the high-temperature deformation behavior of a nickel-based superalloy, a range of tensile tests were carried out at 720, 750, and 780 °C with strain rates ranging from 5 × 10−5 to 5 × 10−3 s−1. A piecewise constitutive model was applied to describe the work hardening-dynamic recovery and dynamic flow softening behaviors. The predicted flow stresses have a good agreement with the experimental results. Microstructures in the fracture frontier of the ruptured specimens were analyzed to further understand the fracture mechanism. Twinning and dislocation structures were surveyed at the tested conditions. Twin structure decreased as temperature increased. These two precipitates were characterized: M23C6 carbide located in the grain boundary and spherical γ′ phase in the matrix. Precipitates, twin and dislocation structures are the dominant strengthening mechanism of the superalloy during high-temperature deformation. Orientations < 111 >//RD and < 001 >//RD were detected as the main texture structure. Cavities formed near the precipitates and triple grain boundary. On the basis of fracture surface observations, the 750H superalloy shows both intergranular and transgranular fracture mode in the tested conditions. The dimples became small and shallow as the strain rate increased.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (51475326) and Demonstration Project of National Marine Economic Innovation (BHSF2017–22).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin University, 135 Yaguan Road, Jinnan District, Tianjin, 300350, People’s Republic of China

    Kaimeng Wang, Hongyang Jing, Lianyong Xu, Yongdian Han, Lei Zhao, Bo Xiao & Shangqing Yang

  2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300350, People’s Republic of China

    Kaimeng Wang, Hongyang Jing, Lianyong Xu, Yongdian Han, Lei Zhao, Bo Xiao & Shangqing Yang

  3. State Key Laboratory of Engines, Tianjin, 300350, People’s Republic of China

    Lianyong Xu

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  1. Kaimeng Wang
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Wang, K., Jing, H., Xu, L. et al. A piecewise constitutive model, microstructure and fracture mechanism of a nickel-based superalloy 750H during high-temperature tensile deformation. J Mater Sci 54, 9775–9796 (2019). https://doi.org/10.1007/s10853-019-03566-w

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