Synergistic impact mechanism of particle size and morphology in superalloy powders for additive manufacturing  

作　　者：Lichong Zhang Liang Zheng Wenyong Xu Na Liu Yufeng Liu Yibo Zhang Jingjing Liang Zhou Li Guoqing Zhang 

机构地区：[1]Science and Technology on Advanced High Temperature Structural Materials Laboratory,AECC Beijing Institute of Aeronautical Materials,Beijing,100095,China [2]Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China

出　　处：《Particuology》2024年第12期279-302,共24页颗粒学报（英文版）

基　　金：supported by the National Science and Technology Major Project (grant No.Y2019-VII-0011-0151);National Natural Science Foundation of China (grant Nos.52071310,52127802).

摘　　要：The particle size and morphology of superalloy powders are crucial parameters that significantly influence the performance of additive manufacturing(AM)processes.This study investigates the effects of atomization pressure on these characteristics through a combination of computational fluid dynamics(CFD)simulations and vacuum induction melting gas atomization(VIGA)experiments.The CFD simulations revealed that increasing the atomization pressure from 2.0 MPa to 3.5 MPa resulted in a rise in maximum gas velocity from 526 m/s to 537 m/s and a reduction in median particle size(D_(50))from 60.9μm to 37.5μm.Subsequent experiments demonstrated a decrease in D_(50)from 52.9μm to 35.6μm,and sphericity from 0.9432 to 0.9377,as pressure increased.The particle size results of the atomization experiments and numerical simulations show strong consistency,validating the accuracy of the numerical simulation results.The volume of hollow particles also increased slightly in specific size fractions.These results suggest that higher atomization pressures produce finer powders with lower sphericity,but also promote particle adhesion,reducing the overall refinement effect.This study provides insights into optimizing atomization conditions for the precise control of superalloy powders in AM.

关 键 词：Superalloy powders Additive manufacturing Atomization pressure CFD modeling Particle size MORPHOLOGY 

分 类 号：TG146[一般工业技术—材料科学与工程] TB383[金属学及工艺—金属材料]