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定向凝固过程的热分析计算包括对如下一些热参数的测定和计算:如铸件上的湿度场和温度梯度场;凝固区固、液相界面上的温度梯度、生长速度和冷却速度;凝固区的宽度和局部凝固时间等。由于定向凝固铸件的力学性能在很大程度上与铸态组织有关,而铸态组织又取决于凝固过程的热参数,因此研究这些参数对合金凝固过程的影响在理论和实践上都有很大意义。由于单晶合金铸件不允许在定向凝固过程中出现多晶,所以对凝固过程的控制要求更加严格。为了确定合适的单晶合金的定向凝固工艺和了解热参数对凝固特性的影响,首先要对热参数进行准确的测定和计算。 本文提出的热分析计算数学模型基本上符合单晶合金定向凝固的热过程,计算结果正确
The thermal analysis of the directional solidification process includes the determination and calculation of some of the following thermal parameters: the humidity field and the temperature gradient field on the casting; the temperature gradient, the growth rate and the cooling rate at the solid-liquid interface in the solidification zone; Width and local setting time. Since the mechanical properties of directional solidification castings are largely related to the as-cast microstructure, which in turn depends on the thermal parameters of the solidification process, it is of great theoretical and practical significance to study the influence of these parameters on the solidification process of the alloy significance. As single crystal alloy castings do not allow polycrystalline during directional solidification, the control of the solidification process is stricter. In order to determine the proper single crystal alloy directional solidification process and to understand the influence of thermal parameters on the solidification properties, the thermal parameters must be accurately measured and calculated. The thermal analysis and calculation mathematical model proposed in this paper is basically in line with the thermal history of single crystal alloy directional solidification, the calculation results are correct