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单晶凝固过程中隔热挡板的控制对温度梯度及温度场均匀性有重要影响,进而会影响到单晶凝固组织,因此需要对隔热挡板进行研究。采用第二代单晶高温合金DD6,研究了不同厚度隔热挡板对DD6单晶高温合金凝固组织的影响。结果表明,随着隔热挡板厚度增加,单晶凝固过程中温度梯度降低,但晶体生长方向与[001]偏离度变小。此外,随着隔热挡板厚度增加,DD6单晶高温合金一次枝晶间距增大,γ-γ′共晶含量和尺寸增加,枝晶干与枝晶间的铸态γ′尺寸略有增加,合金主要元素偏析加大。
In the process of single-crystal solidification, the control of the thermal barrier has an important influence on the temperature gradient and the uniformity of the temperature field, and further affects the single-crystal solidified structure. Therefore, the research on the thermal barrier is needed. The second generation single crystal superalloy DD6 was used to study the influence of different thickness of insulation baffle on the solidification microstructure of DD6 single crystal superalloy. The results show that with the increase of the thickness of the baffle, the temperature gradient decreases during the single crystal solidification, but the deviation of the crystal growth direction from [001] decreases. In addition, as the thickness of the insulation baffle increased, the primary dendrite spacing of DD6 single crystal superalloy increased, the γ-γ ’eutectic content and size increased, and the as-cast γ’ size slightly increased between dendrite and dendrite , The main elements of alloy segregation increased.