低压脉冲磁场与定向凝固结合制备梯度组织K4169高温合金

Gradient Microstructure of K4169 Superalloy Prepared by Low Voltage Pulsed Magnetic Field Combined with Direc-tional Solidification

摘要:

研究了低压脉冲磁场对K4169高温合金组织转变的影响。将低压脉冲磁场与定向凝固相结合，制备了具有柱状晶、粗等轴晶和细等轴晶梯度组织特征的K4169高温合金，为高温合金梯度组织的制备提供了一种新的方法。揭示了合金微观组织的转变机制，模拟了低压脉冲磁场作用下洛伦兹力和流场的分布情况。结果表明：微观组织的转变归因于洛伦兹力和强迫对流的耦合效应。

Abstract:

The influence of the low voltage pulsed magnetic field (LVPMF) on the microstructure transition of K4169 superalloy was investigated. The gradient microstructure of K4169 superalloy composed of columnar grains, coarse grains, and fine grains was prepared through the combined method of LVPMF with directional solidification, which provided a new approach for the preparation of superalloy with gradient microstructure. The distribution of the Lorentz force and flow field under LVPMF effect was simulated, and therefore the microstructure transition mechanism was revealed. Results show that the microstructure transition should be attributed to the coupling effects of the Lorentz force and forced convection.