采用镍基合金粉 ,研究了激光多层涂覆过程中基材晶体取向对涂层凝固组织的影响规律。实验发现 ,在适当的工艺条件下 ,若基材表层的晶体取向与合金择优取向相近或一致时 ,可得到与基材晶体取向一致的涂覆层 ,整个涂层中呈现细小、规整且与基材组织连续的定向柱状枝晶 ,仅顶端存在一薄层取向改变的枝晶生长区。而当基材表层晶体取向与合金择优取向不同时 ,涂层中得到的是取向不规则的细小枝晶 The effects of substrate crystal orientation on the solidified microstructure of the coating during laser multi-layer coating were studied using Ni-based alloy powders. The experimental results show that under proper process conditions, if the crystal orientation of the substrate surface is close to or consistent with the preferred orientation of the alloy, a coating layer consistent with the crystal orientation of the substrate can be obtained. The coating shows fine, Material organization of continuous columnar dendrite orientation, there is only a thin layer at the top of the dendrite growth orientation change. When the crystal orientation of the substrate surface is different from the preferred orientation of the alloy, the fine dendrites with irregular orientation are obtained in the coating