摘要
为解决电弧增材制造TiC颗粒增强Al-Cu合金增强体颗粒团聚与孔隙缺陷等问题,本研究提出并验证了一种基于超音频脉冲(ultrasonic frequency pulse,UFP)电弧调控的熔丝增材制造工艺方法。通过调制电弧热力特性,显著增强了熔池内的对流与紊流行为,改变了传统Marangoni驱动的单环流模式,形成更加均匀的双环流结构,实现了对熔池温度场和流场的精准控制。基于构建的计算流体力学模型揭示了TiC颗粒在UFP电弧作用下的迁移及其与基体混合的机理,直接实验观测与仿真结果具有很好的一致性。结果表明,相较于常规工艺,UFP电弧有助于显著细化晶粒,提高组织均匀性,改善TiC颗粒的分布状态,降低孔洞与夹杂等典型缺陷的数量,该研究可为高性能Al-Cu合金增材制造提供新路径。
To address the issues of TiC particle agglomeration and pore defects of TiC particle-reinforced Al-Cu alloys prepared by wire arc additive manufacturing(WAAM),this study proposed a novel ultrasonic-frequency pulse(UFP)-assisted WAAM process.By modulating arc thermal characteristics,this method enhanced convective and turbulent behaviors in the melt pool,transitioning from a conventional Marangonidriven flow to a more uniform dual-vortex structure.A computational fluid dynamics model was developed to trace TiC particle motion and revealed their improved mixing mechanism with the matrix under UFP conditions.Simulation results were validated by real-time melt pool imaging.Results showed that compared to conventional VPTIG,the UFP-VPTIG technique can significantly refine grains and improve homogeneity.Dispersed TiC particles are more uniformly,and porosity and segregation defects are reduced.This study offers a promising route for manufacturing high-performance Al-Cu alloy components.
作者
姜自昊
曾才有
蔡鑫祎
赵源
杨清福
从保强
Jiang Zihao;Zeng Caiyou;Cai Xinyi;Zhao Yuan;Yang Qingfu;Cong Baoqiang(School of Mechanical Engineering and Automation,Beihang University,Beijing 102206,China;School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《稀有金属材料与工程》
北大核心
2026年第2期389-396,共8页
Rare Metal Materials and Engineering
基金
国家自然科学基金(52305331,52475317)。
关键词
电弧增材制造
颗粒增强
铝合金
微观组织
数值模拟
wire arc additive manufacturing
particle reinforcement
aluminum alloy
microstructure
numerical simulation
