中文摘要：

为了解决激光选区熔化成型零件时扫描线过长导致的层内累积残余应力过大、易发生翘曲变形和裂纹等问题，提出了一种分区扫描策略。采用s形正交扫描策略和分区扫描策略分别规划了零件扫描路径，实验验证了分区扫描策略的有效性。实验结果表明，采用分区扫描策略能有效降低边界拉应力，减小平面残余应力波动，提高成型件的力学性能。

英文摘要：

In order to solve such problems as residual stress accumulated within layers being excessive, and warpage and cracks being easy to occur as a result of the long scanning line when selective laser melting is used to mold parts, one scheme of area-partition scanning is proposed. The S-shaped orthogonal layer cross scanning strategy and area-partition scanning strategy are respectively adopted to plan scanning path and the validity of the latter strategy is experimentally confirmed. The experimental results indicate that, with the area-partition scanning strategy, the tensile stress at rims of molding parts is effectively reduced, the fluctuation of residual stress at surface is weakened, and the mechanical property of molding parts is improved.