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In-situ SEM study of temperature-dependent tensile behavior of Inconel 718 superalloy

  • Metals & corrosion
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Abstract

The effect of deformation temperature on tensile behavior of Inconel 718 alloy has been studied by a self-developed in-situ high-temperature tensile stage inside a scanning electron microscopy at a temperature range from room temperature (RT) to 750 °C. The dynamic microstructure evolution and mechanical properties at different temperatures were performed and compared by the uniaxial tensile tests. The in-situ test results showed that the mechanical properties and fracture mechanisms of Inconel 718 alloy were sensitive to deformation temperatures. From RT to 650 °C, the yield stress and ultimate tensile strength decrease slightly and the tensile ductility is comparable. While up to 750 °C, the yield stress and ultimate tensile strength decrease significantly, the elongation and reduction of cross section also showed a significant decrease from RT to 750 °C. It was found that at RT and 650 °C, tensile cracks tended to initiate around the carbide particles and the triple junctions of grain boundaries, also propagated transgranularly; at 750 °C, the cracks initiated at grain boundaries and propagated intergranularly. In fact, with the increase in deformation temperature, the fracture mechanism transformed from the ductile transgranular fracture to the brittle intergranular fracture.

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Acknowledgements

This research was funded by Basic Science Center Program for Multiphase Media Evolution in Hypergravity of the National Natural Science Foundation of China (No. 51988101) and Key Projects of Beijing Natural Science Foundation (KZ202110005006).

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Authors and Affiliations

  1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China

    Lijun Sang, Junxia Lu, Rafi Ullah & Yuefei Zhang

  2. School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Jin Wang & Ze Zhang

  3. Institute of Science and Technology, Yantai Nanshan University, Yantai, 265700, China

    Xiangcheng Sun

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  1. Lijun Sang
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Correspondence to Junxia Lu or Yuefei Zhang.

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Sang, L., Lu, J., Wang, J. et al. In-situ SEM study of temperature-dependent tensile behavior of Inconel 718 superalloy. J Mater Sci 56, 16097–16112 (2021). https://doi.org/10.1007/s10853-021-06256-8

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  • DOI: https://doi.org/10.1007/s10853-021-06256-8

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