(西北工业大学 凝固技术国家重点实验室， 西安 710072)
摘 要: 建立了一套激光熔凝的数学模型和计算方法，给出了两种条件下熔池深度与扫描速度的关系曲线。计算结果与实验值吻合良好，验证了模型的有效性。根据计算分析了激光工艺参数与激光定向凝固组织的关系。据此通过工艺参数的匹配，在熔池顶部得到了与扫描方向完全一致的凝固组织。
关键字: 激光熔凝；数值模拟；定向凝固
surface re-melting and its use in
laser directional solidification
（State Key Lab of Solidification Processing,
Northwestern Polytechnical University, Xi′an 710072, China）
Abstract:A model and a numerical method of laser surface re-melting were established. The relationship between the depth of laser melted pools and the laser scanning velocity was calculated for two base materials. The calculations agree with the experiments well, and these validate the model. The relationship between the laser processing parameters and laser directional solidification morphology was analyzed by the model. Based on the model, the morphology with the growth direction same with scanning direction was obtained at the top of the melting pool through the match among the processing parameters.
Key words: laser re-melting; numerical simulation; directional solidification
