激光熔凝温度场的数值计算  

The numerical simulation of temperature fields of laser molten pool

作　　者：刘振侠[1] 黄卫东[1] 杨森[1] 刘建睿[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《西北大学学报（自然科学版）》2001年第3期199-202,共4页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目 (5 97710 5 4) ;航空基金资助项目 (97z5 30 0 2 )

摘　　要：利用激光圆形光斑对称性的特点 ,建立了激光表面快速熔凝条件下温度场的二维数值模型。边界条件用点源模型推导 ,同时采用 SIMPLE算法进行计算。在保证精度的条件下简化了计算 (相对于三维 )。计算结果与实验结果吻合良好 ,表明这种算法在一定条件下能够准确地反映激光表面熔凝过程中 ,熔池纵截面的温度场信息及激光重熔过程中生长界面的形态。Based on symmetry of the circular light spot of the laser, a two dimensional numerical simulation of temperature fields of laser molten pool has been developed.The point source model is used to deduce the boundary condition, and SIMPLE method is used to do the calculation.Under the condition that the precision is assured, the calculation has been simplified (compared with three dimensional model). The comparison between the calculation results and the experimental results indicates that the temperature fields information of the longitudinal section along the scanning trace of the laser molten pool got by this method is coincident with the experiment and useful to predict the microstructure.

关 键 词：激光熔凝 熔池 温度场 点源法 数值计算 SIMPLE算法 凝固组织 

分 类 号：TG111.4[金属学及工艺—物理冶金]