Comparative analysis of the hot-isostatic-pressing densification behavior of atomized and milled Ti6Al4V powders
Comparative analysis of the hot-isostatic-pressing densification behavior of atomized and milled Ti6Al4V powders
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雾化和研磨Ti6Al4V粉末热等静压致密化行为的对比分析
DOI：
10.1016/j.jmrt.2020.01.055
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Fenglei Li
中科院分区：
文献类型：
--
作者：
Dongdong You;Yunhao Wang;Chao Yang;Fenglei Li
基于塑性理论和热力耦合有限元方法，建立了雾化球磨Ti6Al4V粉末热等静压过程的数值模型，并进行了实验验证。通过实验和计算方法获得了与模拟相关的关键材料参数。通过对粉末流动和压坯相对密度分布的分析，阐明了两种Ti6Al4V粉末的热等静压致密化机理。结果表明，在相同的工作条件下，两种粉末的致密化趋势没有太大差别，与雾化粉末相比，能量较高的粉末更有利于致密化，能更好地克服“角效应”。球磨粉末烧结体的等轴组织有助于提高其强度，雾化粉末烧结体的片层组织有助于提高其塑性。
A numerical model is established based on the plasticity theory and a thermomechanical coupled finite element method (FEM) to simulate the hot isostatic pressing (HIP) process of atomized and milled Ti6Al4V powders and is then experimentally verified. Key material parameters related to the simulation are obtained by experimental and calculation methods. The HIP densification mechanism for two types of Ti6Al4V powders are clarified through the analysis of the powder flow and relative density distribution of compacts using the proposed model. The results indicate that the densification trends of the two powders are not much different under the same working conditions and that milled powder with a higher energy is more conducive to densification and can better overcome the “corner effect” compared to atomized powder. The equiaxed microstructure of the milled powder sintered body contributes to increasing its strength, whereas the lamellar microstructure of the atomized powder sintered body contributes to increasing its plasticity.