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Effect of Cooling Rate on AlN Precipitation in FeCrAl Stainless Steel During Solidification

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Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
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Department of Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada
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Department of Physical Chemistry of Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(10), 1091; https://doi.org/10.3390/met9101091
Received: 12 September 2019 / Revised: 5 October 2019 / Accepted: 8 October 2019 / Published: 11 October 2019
The effect of cooling rate on the evolution of AlN inclusions precipitated during solidification in FeCrAl stainless steel was investigated using an experimental study and thermodynamic and kinetic calculations. The number and size of AlN inclusions precipitated under different cooling rates were examined with the feature function of the field-emission scanning electron microscope. A model combining micro-segregation and the diffusion-controlled growth model was set up to determine the mechanism of AlN particle growth. The results showed that AlN precipitates in the mushy zone. The size of AlN particles decreases and the number of AlN particles increases with increasing cooling rate, whereas the volume fraction is essentially unchanged. The AlN particles grow during solidification after the content of solutes in molten steel has exceeded the concentration in equilibrium with AlN. The nitrogen content varies significantly with the cooling rate during solidification. Increasing the cooling rate and reducing the nitrogen content in the molten steel can reduce the AlN particle size in FeCrAl alloys as the growth time decreases. View Full-Text
Keywords: FeCrAl stainless steel; AlN; solidification; micro-segregation; diffusion-controlled growth; cooling rate FeCrAl stainless steel; AlN; solidification; micro-segregation; diffusion-controlled growth; cooling rate
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Deng, Z.; He, Y.; Liu, J.; Yan, B.; Yang, Y.; McLean, A. Effect of Cooling Rate on AlN Precipitation in FeCrAl Stainless Steel During Solidification. Metals 2019, 9, 1091.

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