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采用数值模拟与实验验证相结合的方法研究了型壳不同预热温度和厚度对凝固两相区温度梯度的影响。型壳预热温度对温度梯度的影响主要表现在凝固前期;型壳厚度对温度梯度的影响主要体现在凝固后期热量的散失方式上。结果表明,在型壳的预热温度从1 450℃增加到1 550℃的过程中,平均温度梯度不断增大,最大值为42.1℃/cm;分别考察了4~8 mm厚度型壳的凝固过程,平均温度梯度先增大后减小,当型壳厚度超过一定范围时,温度梯度的变化很小,在厚度为6 mm时达到最大值43.8℃/cm。
The effects of different preheating temperature and thickness on the temperature gradient in the solidified two-phase zone were studied by numerical simulation and experimental verification. The influence of shell preheating temperature on temperature gradient is mainly in the pre-solidification stage. The influence of shell thickness on temperature gradient is mainly reflected in the way of dissipating heat in the late stage of solidification. The results showed that the average temperature gradient increased continuously with the maximum value of 42.1 ℃ / cm when the shell preheating temperature increased from 1 450 ℃ to 1 550 ℃. The solidification of 4 ~ 8 mm shell During the process, the average temperature gradient first increases and then decreases. When the shell thickness exceeds a certain range, the temperature gradient changes little, reaching a maximum of 43.8 ° C / cm at a thickness of 6 mm.