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本文通过计算机模拟镍基高温合金平板试样HRS定向凝固过程,建立了二维瞬态导热数学模型,并用此模型和以TP801B单板机为核心的控制系统,对镍基高温合金平板试样定向凝固过程中的固/液界面位置进行了实时控制,结果表明,受控试样的固/液界面位置能很快地趋于并稳定在隔热板附近。对界面位置的控制能有效地提高固/液界面前沿液体中的温度梯温及其稳定性,对合金的宏观和微观组织均有明显的改善。
In this paper, the two-dimensional transient thermal conductivity mathematical model was established by computer simulation of the HRS directional solidification process of the Ni-based superalloy plate sample. With this model and the control system with the TP801B single-plate machine as the core, the Ni-based superalloy plate samples were oriented The solid / liquid interface position in the solidification process was controlled in real time. The results show that the solid / liquid interface position of the controlled sample can quickly tend to and stabilize near the heat shield. The control of the position of the interface can effectively improve the temperature gradient and the stability of the liquid in the front liquid / solid interface, and obviously improve the macroscopic and microstructure of the alloy.