Deformation Transmission Mechanism in Reduction Process During Steel Casting and Its Impact on Density
Metallurgical and Materials Transactions B(2024)
摘要
The solidification process of castings is prone to shrinkage porosity and macroscopic segregation defects. Utilizing a reduction technique to control the defects in the solidification process of castings is an effective method. In order to investigate the influence mechanism of reduction technology on the reduction-induced deformation at different positions during the solidification process of castings and the impact on the density of solidification structure, laboratory experiments on the reduction-induced deformation of steel ingots during solidification were conducted. Corresponding finite element numerical simulations were performed, and micro-CT detection was employed to analyze the pore distribution of the ingots. It was found that reduction-induced deformation during the solidification can effectively enhance the density of steel ingots. This study also innovatively introduces the concept of relative deformation displacement and reduction-induced deformation transfer coefficient, providing a measure of the actual compression deformation at different positions in the steel ingot during the reduction-induced deformation process. When the fraction solid is less than 0.70, the reduction-induced deformation transfer coefficient is ranging between 1.1 and 1.2. However, when the fraction solid is greater than 0.75, the reduction-induced deformation transfer coefficient rapidly decreases with an increase in the fraction solid until it reaches zero.
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