激光熔凝过程的SPH法数值模拟  

Numerical simulation of laser remelting process based on smoothed particles hydrodynamics method

作　　者：刘石柏[1] 刘继常[1] 齐利军 卢娟华 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]湖南水利水电勘测设计研究总院,湖南长沙410007

出　　处：《材料热处理学报》2017年第1期184-190,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(751215068)

摘　　要：运用光滑粒子流体动力学(smoothed particles hydrodynamics,SPH)法建立了激光熔凝过程的数值模型。并应用该模型对AISI304不锈钢的激光熔凝过程进行数值模拟,分析在不同激光功率和扫描速度下对熔池速度场、温度场及其宽度和深度的影响。结果表明:熔池的最高温度相对激光光斑中心偏移一定的距离,且偏移距离随扫描速度的增加而增大,但随激光功率的增加则保持不变。同时也为研究激光熔覆的自由表面形貌的形成过程提供SPH理论基础和数值分析方法。A numerical model of laser remelting process was established by smoothed particle hydrodynamics（ SPH） method.Then the model was used to simulate the laser remelting process of AISI304 stainless steel.The influences of different laser powers and scanning speeds on the velocity field,temperature field and the width and depth of the melt pool were analyzed.The results show that the melt pool maximum temperature relative the laser spot center to offset a certain distance,and the offset distance increases with increasing the scanning speed,while with the increase of the laser power,the offset distance remains not changed.Meanwhile,it can be provides the SPH theoretical basis and a numerical analysis method to study the formation process of the free surface profile in laser cladding.

关 键 词：光滑粒子流体动力学法 激光熔凝 数值模型 偏移距离 

分 类 号：TN241[电子电信—物理电子学] TH249[机械工程—机械制造及自动化]