Development of theoretical process maps to study the role of powder preheating in laser cladding
Development of theoretical process maps to study the role of powder preheating in laser cladding
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DOI：
10.1016/j.commatsci.2005.10.005
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发表时间：
2006-10
影响因子：
3.3
通讯作者：
Subrata Kumar;Subhransu Roy
中科院分区：
文献类型：
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作者：
Subrata Kumar;Subhransu Roy
熔覆是通过熔融在基材上沉积上级组合层的过程。在喷吹粉末激光熔覆工艺中，粉末穿过激光路径，通过吸收激光能量而被加热，并最终在强激光束下熔化在基材上;随着基材远离，该熔池固化形成连续的堆焊层。激光能量在其飞行路径（称为预热）期间部分被固体粉末吸收，部分被熔池的顶表面吸收。在本研究中，一个二维的传导传热方程已被解决，采用有限体积法来模拟熔覆过程。据观察，预热允许更高的扫描速度，导致薄的熔覆层与低稀释。预热还允许高粉末进料速率，从而产生具有低稀释度的厚包覆层。
Cladding is the process of depositing a superior built-up layer by fusion on a substrate. In blown powder laser cladding process, the powder travels across the laser path, gets heated up by absorbing laser energy, and finally melts on the substrate under the intense laser beam; as the substrate moves away this melt pool solidifies to form a continuous built-up layer. The laser energy is partly absorbed by the solid powder during its flight path (termed preheating) and partly by the top surface of the melt pool. In the present study a two-dimensional conduction heat transfer equation has been solved using finite-volume method to model the cladding process. It is observed that preheating allows higher scanning speed resulting in thin clad layer with low dilution. Preheating also permits high powder feed rate resulting in thick cladding with low dilution.