Abstract
The effects of the cooling rate on the morphology and diameter distribution of BN inclusions and the solidification structure have been observed. The precipitation and growth behavior of BN inclusions during solidification have been analyzed with the help of thermodynamics and kinetics. The experimental results show that the diameter of BN inclusions increases with the decrease of cooling rate. The calculation results show that the segregation of boron is much stronger than that of nitrogen. Considering the segregation of solutes, BN formation takes place only in the mushy region when the solid fraction is close to 1 during solidification of BN free-machining steel. The difference between the nitrogen concentration in the remnant liquid phase increased by segregation and that in equilibrium is a driving force for BN growth. With the increase of cooling rate, the time for BN growth decreases and the radius of the precipitated BN inclusions is reduced.
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