钛合金激光熔凝熔池流场及温度场的数值模拟  

A Numerical Simulation for Fluid Flow and Temperature Field in the Molten Pool of Laser Cladding on Titanium Alloy

作　　者：王维[1] 刘奇[1] 杨光[1] 钦兰云[1] 薛雄[1] 

机构地区：[1]沈阳航空航天大学航空制造工艺数字化国防重点学科实验室,辽宁沈阳110136

出　　处：《应用激光》2014年第5期389-394,共6页Applied Laser

基　　金：国家自然基金资助项目(项目编号:51305280);辽宁省高校创新团队资助项目(项目编号:LT2011004)

摘　　要：应用FLUENT软件建立BT20激光熔凝过程的数学模型,考虑材料热物性能参数与温度的非线性关系以及边界条件,分析表面张力温度系数和激光功率对激光熔池内的温度分布,流动状态及熔池形貌的影响,并与试验结果进行对比。结果表明,表面张力温度系数影响熔池内熔化凝固的过程,表面张力温度系数的增大使熔池变宽变窄。随着功率的增加,熔池尺寸扩大,工件温度提高,熔池流体流动加速,数值模拟结果与试验结果相吻合。The physical model in laser cladding process was established by Fluent software,the boundary condition and the nonlinear relationship between the temperature and thermo-physical parameters were considered,the effect of the surface tension temperature coefficient and laser power on the molten temperature distribution,velocity field and molten shape was analyzed,and then the results of simulation were compared with experimental results.The results showed that surface tension temperature coefficient significantly alters the characteristics of the thawing and solidifying process,and the increase of surface tension temperature coefficient makes the molten pool wider and shallower.With the increase of laser power,the size of the molten pool,the temperature and the velocity of fluid flow is increasing.The results obtained by the simulation are coincident with those measured in experiment basically.

关 键 词：激光熔凝 BT20 数值模拟 流场 熔池形貌 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]