航空科学技术2025，Vol.36Issue(5)：27-34,8.DOI:10.19452/j.issn1007-5453.2025.05.003
热积累对激光熔化沉积TiC/Ti6Al4V复合材料组织和性能的影响
Influence of Heat Accumulation on the Microstructure and Performance of TiC/Ti6Al4V Composite by Laser Melting Deposition
摘要
Abstract
Titanium matrix composites are widely used in the field of aviation.It is important to study the microstructure and properties of aviation materials.In this paper,TiC/Ti6Al4V titanium matrix composites were prepared by laser melting deposition(LMD).The effect of heat accumulation caused by the increase of deposited layers on the microstructure and microhardness of the composites was investigated by finite element numerical simulation.The effects of heat accumulation on the morphology and microstructure of multilayer samples were analyzed by simulating the temperature field during LMD.The results show that the initial deposited layer has a high cooling rate,resulting in insufficient flow of the molten pool and small formation width of the deposit.With the increase of the number of deposited layers,the heat accumulation effect inside the deposited layers increases,the melting pool temperature of the new deposited layer increases,and the ability of trapping powder increases.Therefore,the width of the deposited layer increases.The resulting shape is thin at the bottom and wide at the top.In addition,the increase in the number of deposited layers leads to an increase in the peak temperature and a decrease in the cooling rate of the molten pool.This promotes the dissolution of TiC powder particles,resulting in an increase in the in-situ TiC content and the hardness of the composite.关键词
激光熔化沉积/复合材料/数值模拟/微观组织/力学性能Key words
LMD/composite/numerical simulation/microstructure/mechanical properties分类
金属材料引用本文复制引用
王建东,范慕实,曾禹周,李俐群..热积累对激光熔化沉积TiC/Ti6Al4V复合材料组织和性能的影响[J].航空科学技术,2025,36(5):27-34,8.基金项目
航空科学基金(2022Z0550P6001) （2022Z0550P6001）
中央高校基本科研业务费(3072024JJ1004) （3072024JJ1004）
材料结构精密焊接与连接全国重点实验室开放课题(MSWJ-24M05) Aeronautical Science Foundation of China(2022Z0550P6001) （MSWJ-24M05）
Fundamental Research Funds for the Central Universities(3072024JJ1004) （3072024JJ1004）
Open Project of State Key Laboratory of Precision Welding&Joining of Materials and Structures(MSWJ-24M05) （MSWJ-24M05）
