Abstract
Stainless steel 316L specimens were snug fitted into a rotating disk submerged in molten LBE and subjected to spatially varying local flow velocity along the radial position. The specimens experienced LBE flow velocity from 0.50 m/s to 3.14 m/s depending on their radial location. The test was conducted at 600°C with an oxygen concentration of 2.87 × 10−8 wt% for 150 h. Resulting microstructural characteristics of the corroded zone were found to be sensitively affected by local flow velocity and were categorized into four regimes. For linear disk velocity > 2.0 m/s, the affected zone thickness became increasingly less sensitive to flow velocity as the overall reaction became reaction rate controlled. At the velocity of ~ 3.0 m/s, erosion-corrosion started to take place. The flow effect on the affected zone thickness (\(l\)) agreed with the model based on the disk velocity (\(v\)) effect on the mass transfer of a rotating disk as \(\frac{1}{l}\sim v^{ - 0.792}\).
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Notes
The experimental conditions of the presented study are as follows:
T= 600°C. \(\omega =\) 41.89 rad/s. r = 12 (inner most location) – 75 (outer most location) mm.
\(\nu = 0.00537 - 8.92 \times 10^{ - 6} T + 4.71 \times 10^{ - 9} T^{2} = 1.17 \times 10^{ - 3}\) (cm2/s at T = 873K)14 \(D_{Ni} = 1.7 \times 10^{ - 3} \exp \left( { - \frac{{3.63 \times 10^{4} }}{RT}} \right) = 1.14 \times 10^{ - 5}\) (cm2/s at T = 873K)30 \(Sc = \frac{\nu }{{D_{Ni} }} = 102.5\), \(Re_{\omega } = 5.16 \times 10^{4} - 2.01 \times 10^{6}\), respectively.
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Acknowledgements
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT: Ministry of Science and ICT) (no. 2019M2D1A1067209).
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Choi, J., Hwang, I. & Lee, Y. Flow Accelerated Corrosion of Stainless Steel 316L by a Rotating Disk in Lead-Bismuth Eutectic Melt. JOM 73, 4030–4040 (2021). https://doi.org/10.1007/s11837-021-04953-y
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DOI: https://doi.org/10.1007/s11837-021-04953-y