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Simulation and Experimental Studies on Grain Selection and Structure Design of the Spiral Selector for Casting Single Crystal Ni-Based Superalloy

机译：铸造单晶镍基高温合金螺旋选择器的晶粒选择与组织设计的仿真与实验研究

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Grain selection is an important process in single crystal turbine blades manufacturing. Selector structure is a control factor of grain selection, as well as directional solidification (DS). In this study, the grain selection and structure design of the spiral selector were investigated through experimentation and simulation. A heat transfer model and a 3D microstructure growth model were established based on the Cellular automaton-Finite difference (CA-FD) method for the grain selector. Consequently, the temperature field, the microstructure and the grain orientation distribution were simulated and further verified. The average error of the temperature result was less than 1.5%. The grain selection mechanisms were further analyzed and validated through simulations. The structural design specifications of the selector were suggested based on the two grain selection effects. The structural parameters of the spiral selector, namely, the spiral tunnel diameter (dw), the spiral pitch (hb) and the spiral diameter (hs), were studied and the design criteria of these parameters were proposed. The experimental and simulation results demonstrated that the improved selector could accurately and efficiently produce a single crystal structure.
机译：晶粒的选择是单晶涡轮叶片制造中的重要过程。选择器结构是晶粒选择以及定向凝固（DS）的控制因素。通过实验和仿真，研究了螺旋选择器的晶粒选择和结构设计。基于元胞自动机-有限差分（CA-FD）方法建立了晶粒选择器的传热模型和3D微结构增长模型。因此，模拟并进一步验证了温度场，显微组织和晶粒取向分布。温度结果的平均误差小于1.5％。通过模拟进一步分析和验证了晶粒选择机制。根据两种晶粒选择效果，提出了选择器的结构设计规范。研究了螺旋选择器的结构参数，即螺旋隧道直径（dw），螺旋节距（hb）和螺旋直径（hs），并提出了这些参数的设计准则。实验和仿真结果表明，改进的选择器可以准确有效地产生单晶结构。

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