数值模拟雾化气压对GH4169合金粉末粒径的影响

针对工艺参数与高温合金雾化粉末粒径间的复杂联系，采用ANSYS-Fluent数值模拟GH4169高温合金真空感应气雾化(VIGA)制粉过程中液滴的破碎行为，分析了雾化气压对金属熔体雾化过程和粉末粒度分布的影响.结果表明:一次雾化过程的带状液膜厚度和液滴面积逐渐减小；二次雾化对熔体的破碎作用逐渐增强，雾化所得粉末粒径越来越细小，中位径从81.10 μm减小到69.80，64.77，52.30，41.80μm；细粉收得率逐渐提高，由1.72%提高到12.62%，18.89%，56.50%，71.54%.

Numerical Simulation of Influence of Atomization Pressure on Particle Size of GH4169 Alloy Powders

Aiming at exploring the complex relationship between vacuum induction gas atomization (VIGA) process parameters and particle sizes of superalloy powders， the ANSYS-Fluent software was used to simulate the breaking behavior of droplets during the GH4169 superalloy VIGA process. The influence of atomization pressure on the atomization process and particle size distributions of the melt metal was analyzed. The results showed that the thickness of the strip-shaped liquid film and the droplet area in the first atomization process gradually decreased， while the crushing effect of the secondary atomization on the melt was gradually enhanced. The particle size of the atomized powders was reduced from 81.10 to 69.80， 64.77， 52.30 and finally to 41.80 μm. Correspondingly， the yield of fine powders was gradually improved from 1.72% to 12.62%， 18.89%， 56.50%， and finally to 71.54%.