Abstract Conventional surface-structuring processes often share two crucial disadvantages. Firstly, an additional surface finishing is needed and secondly, these structuring processes are based on the removal and thus result in the waste of material. This work focusses on an experimental investigation of surface structuring by laser melting (WaveShape) on Inconel 718, a process in which surface structures are mainly created by reallocation of molten material. Circular laser beam diameters of 125 µm, 250 µm, and 500 µm with a top-hat shaped intensity distribution, and scan speeds in the range of 25 mm/s to 200 mm/s were investigated for a sinusoidal modulation of laser power between 20 W and 365 W. Structure heights of up to 15 µm were achieved on single tracks after one process step and up to 75 µm after multi-pass processing. Areal surface structuring was demonstrated for wave and burling structures. Based on a process map generated from single track experiments, the achieved structure height for areal structuring could be predicted with sufficient accuracy. The results show that WaveShape is well suited to controllably create a variety of surface structures on Inconel 718.

中文翻译：

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使用不同的激光束直径和扫描速度在 Inconel 718 上通过激光重熔 (WaveShape) 进行表面结构化的实验研究

摘要 传统的表面结构化工艺通常有两个重要的缺点。首先，需要额外的表面精加工，其次，这些结构化过程基于去除，因此导致材料浪费。这项工作的重点是在 Inconel 718 上通过激光熔化 (WaveShape) 进行表面结构化的实验研究，该过程主要通过重新分配熔融材料来创建表面结构。研究了圆形激光束直径为 125 µm、250 µm 和 500 µm，具有礼帽形强度分布，扫描速度在 25 mm/s 到 200 mm/s 范围内，用于激光功率的正弦调制在 20 W 和 365 W。在一个工艺步骤后，在单个轨道上实现了高达 15 µm 的结构高度，在多道处理后实现了高达 75 µm 的结构高度。展示了波浪和隆起结构的面状表面结构。基于从单轨实验生成的过程图，可以足够准确地预测区域结构所达到的结构高度。结果表明，WaveShape 非常适合在 Inconel 718 上可控地创建各种表面结构。