制粉方法对Inconel718合金粉末组织和性能的影响

Effect of powder preparing method on microstructure and performance of Inconel718 alloy powder

以Inconel718合金为研究对象,分别采用等离子旋转电极法(PREP)和气体雾化法(VIGA)制备了金属球形粉末,研究了不同制粉方法对粉末在热处理前后的组织和成分分布的影响,采用对流热交换原理对两种制粉方法对应的冷速进行了模拟计算。分析结果表明:采用PERP法制备的Inconel718合金粉末在氧增量、球形度及流动性方面具有一定的优势,而VIGA法制备粉末有利于提高粉末的显微硬度、细粉粒径;两种粉末经过相同的热处理工艺后,其组织变化规律相同,均析出富Nb和Mo相。模拟计算结果表明:VIGA法制备细粒径粉末的冷速明显高于PREP法对应的粉末,与实验对应的性能数据结果相吻合。

Inconel718 alloy was studied, and the metal spherical powder was prepared by plasma rotary electrode method(PREP) and gas atomization(VIGA), and the effects of different powder methods on microstructure and component distribution before and after heat treatment were studied. The cooling speed corresponding to the two powder floating methods was simulated by the flow heat exchange principle. The analysis results show that the Inconel718 alloy powder prepared by PERP method has a certain advantage in oxygen increment, sphericalness, and fluidity, and powder prepared by VIGA method facilitates improving the microharmal hardness of the powder, fine powder particle size. When the powder is subjected to the same heat treatment process, the microstructure change is the same, and Nb and Mo are analyzed. The results of the simulation calculations show that the fine-race-free powder is significantly higher than the powder corresponding to the PREP method, which is consistent with the performance data results corresponding to the experiment.