摘要
电子束"毛化"技术是一项新兴的电子束表面加工技术,它可通过磁场对电子束实现精密控制,通过金属熔化、流动、堆积、冷却等过程实现表面"毛化"效果。该技术可被应用于金属与复合材料间的异种材料连接、表面涂层预处理等领域。应用计算流体动力学建立了可描述电子束"毛化"过程的数值模型,通过移动脉冲热源模型模拟电子束的快速重复扫描过程,应用VOF方法追踪熔池的自由表面,并通过编写用户自定义子程序实现外加能量/动量源项的加载。对不同频率下的电子束"毛化"过程进行模拟,结果与实验一致差值在10%以内,证明了模型的有效性。另外,模拟和实验均证明,当扫描频率为0.5 Hz时,可形成最佳"毛化"效果。
Electron beam surfi-sculpt is a novel surface processing technique,in which by electron beam customized textured surface can be produced on metal substrate.In this paper,electron beam surfi-sculpt process was simulated by computational fluid dynamics(CFD),in which a moving pulse-heat model was used to describe the heating and a VOF model was applied to simulate free surface of molten pool.External momentum/energy sources were compiled into FLUENT by user-defined functions.The protrusion profiles under different scanning frequencies were calculated.The difference of simulation results and experiment results is within 10%,thus proving the validity of simulation model.Furthermore,both from simulation and experiments,it shows the best textured surface under scanning frequency equal to 0.5 Hz.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第S2期155-158,共4页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(50505019,50935008,50975268)
New Century Excellent Talents in University(NCET-07-0503)
Zhejiang Provincial Scientific Research Project(2009C21019)
关键词
电子束“毛化”技术
计算流体动力学
数值模拟
electron beam surfi-sculpt
computational fluid dynamics
numerical simulation