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| 激光表面快速熔凝过程中熔区组织重构 | |
| 引用本文： | 杨森,黄卫东,刘文今,苏云鹏,周尧和. 激光表面快速熔凝过程中熔区组织重构[J]. 应用激光, 2001, 21(4): 225-228 |
| 作者姓名： | 杨森 黄卫东 刘文今 苏云鹏 周尧和 |
| 作者单位： | 1. 清华大学机械系，北京100084；西北工业大学凝固技术国家重点实验室，西安710072 2. 西北工业大学凝固技术国家重点实验室，西安710072 3. 清华大学机械系北京100084 |
| 基金项目： | 国家自然科学基金(59771054),清华大学985重点基金资助项目 |
| 摘 要： | 利用晶体生长的最小过冷度判据,对单晶合金激光重熔区组织的生长速度进行了分析,建立了枝晶尖端生长速度与激光束扫描速度和固液界面前进速度的关系.根据此分析对熔池进行了重构和预测,发现激光熔池中枝晶组织的生长方向强烈地受基材晶粒取向和激光束扫描方向的影响.枝晶生长条件下,择优取向对枝晶生长方向的影响要较热流的影响大.理论预测与实验结果相吻合. |
| 关 键 词： | 激光表面熔凝 熔池 组织 重构 |
| 修稿时间： | 2001-01-18 |
Reconstruction of Molten Pool During Laser Surface Remelting |
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| Yang sen ,,Huang Weidong ,Liu Wenjin ,Su Yunpeng ,Zhou Yaohe. Reconstruction of Molten Pool During Laser Surface Remelting[J]. Applied Laser, 2001, 21(4): 225-228 | |
| Authors: | Yang sen Huang Weidong Liu Wenjin Su Yunpeng Zhou Yaohe |
| Affiliation: | Yang sen 1,2,Huang Weidong 2,Liu Wenjin 1,Su Yunpeng 2,Zhou Yaohe 2 |
| Abstract: | A growth velocity analysis was carrid out during laser surface remelting processing based on a minimum velocity or minimum undercooling criterion and the relationships between dendrite growth velocities in the three <100> direction,moving velocities of the solid/liquid interface and laser scanning velocities for the different crystallographic orientation were also set up. The analysis results show that crystallographic effects can influence dendrite growth by favoring growth along a preferred crystallographic direction. According to this analysis,the molten pool shapes were reconstructed and predicted, which was agreement with the experimental results. |
| Keywords: | laser surface remelting molten pool microstructure reconstruction |
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