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Effect of high-temperature supercritical carbon dioxide exposure on the microstructure and tensile properties of diffusion-bonded Alloy 690

  • Metals & corrosion
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Abstract

Alloy 690 was diffusion-bonded and exposed to the high-temperature supercritical CO2 environment, and the effect of exposure on the microstructure and mechanical properties was investigated. In the as-bonded joint, some small carbides are discontinuously arranged along the bonding line. After exposure at 550 °C and 600 °C, the continuous carbides are developed and occupy all the grain boundaries and bonding line. The continuous carbides transform into the discrete large particles when the exposure temperature further increases to 650 °C. With the increase in exposure temperature, the tensile strength and microhardness of the joints decrease, while the elongation first slightly increases and then decreases at 650 °C. For the as-bonded joint and the joints exposed at 550 °C and 600 °C, the fracture occurs at the parent Alloy 690 and the main fracture mode is the ductile dimple fracture. However, for the joint exposed at 650 °C, the fracture occurs at the bond line with a manner of brittle fracture. The degradation of strengths and elongation after exposure to supercritical CO2 at 650 °C were associated with the growth of carbides along the bond line.

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The raw/processed data required to reproduce these findings cannot be shared at this time due to technical or time limitations. They will be shared upon reasonable request.

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Acknowledgements

This study was supported by the Engineering Research Center Program (No. 2016R1A5A1013919), the Nuclear R&D Program (No. 2018M2A8A4081309) of the MOST/NRF, the BK-Plus Program of the MSIP/NRF of Rep. of Korea and the Sichuan Science and Technology Program of P.R. China (No. 2018JY0155). H. Chen acknowledges support from the China Scholarship Council.

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Authors and Affiliations

  1. Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea

    Hongsheng Chen, Sung Hwan Kim & Changheui Jang

  2. Shenzhen Clean Energy Research Institute, Shenzhen, 518000, People’s Republic of China

    Hongsheng Chen

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  1. Hongsheng Chen
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  2. Sung Hwan Kim
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Correspondence to Changheui Jang.

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Chen, H., Kim, S.H. & Jang, C. Effect of high-temperature supercritical carbon dioxide exposure on the microstructure and tensile properties of diffusion-bonded Alloy 690. J Mater Sci 55, 3652–3667 (2020). https://doi.org/10.1007/s10853-019-04222-z

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