对激光扫描的第一层分析，在扫描过程中，熔池附近热变形较大。随着熔池移动，热变形始终保持在2 μm附近波动。第一层扫描结束后，整体迅速冷却降温，热变形也迅速减小，最终趋于稳定（1.12 μm）。当三层扫描结束后，第一层因多次的热膨胀其变形最大，第二层和第三层的热变形则逐渐减小。

For the first layer analysis of laser scanning, the thermal deformation near the molten pool is large during the scanning process. As the molten pool moves, the thermal deformation always fluctuates around 2μm. After the first layer of scanning, the whole body cools down rapidly, and the thermal deformation also decreases rapidly, and finally tends to be stable (1.12μm). When the three-layer scanning is finished, the deformation of the first layer is the largest due to multiple thermal expansions, and the thermal deformation of the second and third layers gradually decreases