氧化铝激光选区熔化温度场模拟

发布时间：2018-08-20 15:38

【摘要】：基于ANSYS模拟分析了激光选区熔化(Selective Laser Melting,SLM)Al_2O_3陶瓷过程中的温度场,研究了激光功率和扫描速率对熔池热行为的影响,并结合实验验证了模型的可靠性。结果表明:当激光功率由100 W增加到200 W时,熔池的最高温从1 619.02 K增加到3 276.79 K,升温速率极值从2.05×106 K/s增加到4.90×106 K/s;当扫描速率由60 mm/s增加到120 mm/s时,熔池的最高温由2 754.45 K减少到1 980.59 K,而升温速率极值由2.65×106 K/s增加到3.57×106 K/s,降温速率极值由2.15×106 K/s增加到2.63×106 K/s;当扫描速率固定为90 mm/s时,熔池的最高温度是影响降温速率值的直接因素,熔池最高温度越高(激光功率越大),降温速率越大。随着激光功率的增加或者扫描速率的减少,熔池的尺寸逐渐增大。对比实验与模拟数据,发现模拟结果能够说明试样的表面质量和粉末的熔化状态随激光工艺参数而变化的趋势。
[Abstract]:Based on ANSYS, the temperature field in the process of laser selective melting (SLM) Al_2O_3 ceramics was simulated and analyzed. The effects of laser power and scanning rate on the thermal behavior of molten pool were studied. The reliability of the model was verified by experiments. The results show that the highest temperature of molten pool is 1619.02 when the laser power is increased from 100 W to 200 W. When the scanning rate increased from 60 mm/s to 120 mm/s, the maximum temperature of the molten pool decreased from 2 754.45 K to 1 980.59 K, while the temperature rising rate increased from 2.65 x 106 K/s to 3.57 x 106 K/s, and the cooling rate increased from 2.15 x 106 K/s to 2.63 x 106 K/s. When the tracing rate is fixed at 90 mm/s, the maximum temperature of the molten pool is the direct factor affecting the cooling rate. The higher the maximum temperature of the molten pool (the greater the laser power), the greater the cooling rate. With the increase of laser power or the decrease of scanning rate, the size of the molten pool increases gradually. Compared with the experimental and simulation data, it is found that the simulation results can explain the experiment. The surface quality of the sample and the melting state of the powder change with the laser processing parameters.
【作者单位】： 南京理工大学机械工程学院江苏省高端制造装备与技术工程实验室;
【基金】：国家自然科学基金(51375242) 江苏省重点研发计划(BE2015165)资助
【分类号】：TQ174.1
，

本文编号：2194148