(西北工業(yè)大學(xué) 凝固技術(shù)國家重點(diǎn)實驗室， 西安 710072)
摘 要: 建立了一套激光熔凝的數(shù)學(xué)模型和計算方法，給出了兩種條件下熔池深度與掃描速度的關(guān)系曲線。計算結(jié)果與實驗值吻合良好，驗證了模型的有效性。根據(jù)計算分析了激光工藝參數(shù)與激光定向凝固組織的關(guān)系。據(jù)此通過工藝參數(shù)的匹配，在熔池頂部得到了與掃描方向完全一致的凝固組織。
關(guān)鍵字: 激光熔凝；數(shù)值模擬；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
