【摘要】：基于ANSYS模擬分析了激光選區(qū)熔化(Selective Laser Melting,SLM)Al_2O_3陶瓷過程中的溫度場,研究了激光功率和掃描速率對熔池熱行為的影響,并結合實驗驗證了模型的可靠性。結果表明:當激光功率由100 W增加到200 W時,熔池的最高溫從1 619.02 K增加到3 276.79 K,升溫速率極值從2.05×106 K/s增加到4.90×106 K/s;當掃描速率由60 mm/s增加到120 mm/s時,熔池的最高溫由2 754.45 K減少到1 980.59 K,而升溫速率極值由2.65×106 K/s增加到3.57×106 K/s,降溫速率極值由2.15×106 K/s增加到2.63×106 K/s;當掃描速率固定為90 mm/s時,熔池的最高溫度是影響降溫速率值的直接因素,熔池最高溫度越高(激光功率越大),降溫速率越大。隨著激光功率的增加或者掃描速率的減少,熔池的尺寸逐漸增大。對比實驗與模擬數(shù)據(jù),發(fā)現(xiàn)模擬結果能夠說明試樣的表面質(zhì)量和粉末的熔化狀態(tài)隨激光工藝參數(shù)而變化的趨勢。
[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.
【作者單位】： 南京理工大學機械工程學院江蘇省高端制造裝備與技術工程實驗室;
【基金】：國家自然科學基金(51375242) 江蘇省重點研發(fā)計劃(BE2015165)資助
【分類號】：TQ174.1
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本文編號：2194148