Particle size dependence of the microsegregation and microstructure in the atomized Ni-based superalloy powders:Theoretical and experimental study  

作　　者：Jikang Li Mingsheng Yang Yunfei Cai Yuanyuan Zhang Qingshuai Feng Jiantao Liu Tong Liu 

机构地区：[1]Key Laboratory of Aerospace Materials and Performance(Ministry of Education)School of Materials Science and Engineering,Beihang University,Beijing 100191,China [2]Central Iron and Steel Research Institute,Beijing 100081,China

出　　处：《Journal of Materials Science & Technology》2024年第4期54-65,共12页材料科学技术（英文版）

基　　金：support of this work by the National Science and Technology Major Project(No.2017-Ⅵ-0008-0078);the National Key Research and Development Program of China(No.2022YFB3803802);the National Natural Science Foundation of China(No.U1560106).

摘　　要：The microstructure and microsegregation of atomized powder,which depend on their sizes,are of great importance to the mechanical properties of the consolidated bulk materials.Therefore,it is necessary to reveal the relationship between particle size and powder attributes.The effects of particle size on the so-lidification characterization of the atomized Ni-based superalloy powders were studied via finite element simulation.Based on the simulations,a model was developed to predict the microsegregation and mi-crostructure of atomized powders with different sizes and study the influence of thermal history on the powder attributes during the atomization processes.The radiation heat transfer and temperature gradi-ent within the rapid solidification alloy powders were taken into account in this model.For validating the accuracy of the model,the predictions of the present model were compared with the microsegregation and microstructure of the specific size powder close to the screen mesh size.The results showed that mi-crostructure depended primarily on the temperature gradient within the powder,while the solidification rate had a more significant effect on the microsegregation.The model predicted microstructure features in agreement with the experiment,and for microsegregation,the deviations of prediction for most ele-ments were less than 10%.This work provides a new model to precisely predict the microsegregation and microstructure of the atomized alloy powders and sets a foundation to control the powder features for various engineering applications.

关 键 词：Particle size Solidification microstructure MICROSEGREGATION Numerical simulation 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG156.5[金属学及工艺—合金]