In order to improve the forming quality of the Inconel 625 cladding layer and make it to be more widely used. This paper addresses an experimental investigation on the influence of major process parameters like laser power, scanning speed, powder feed rate, and overlapping rate along with their interactions on surface roughness and width error of laser additive manufacturing process for forming Inconel 625 samples. Taguchi method and grey relational analysis were used to optimize the selected parameters, and the verification tests were carried out. The change of microhardness and microstructure in the overlapping zone and nonoverlapping zone of the cladding layer were studied by microhardness tester and scanning electron microscopy (SEM). The results show that the most significant effect in processing parameters on surface roughness and width error are both overlapping rate, and the optimal levels of laser power, scanning speed, powder feeder rate, and overlapping rate are 1800 W, 8 mm/s, 10 g/min, and 30%, respectively. Analysis of microstructure and composition showed that the content of Cr was high both in the Laves phase and matrix, the content of Nb in the Laves phase increased significantly and reached up to 24.48 wt%, and the Laves in the nonoverlapping zone was more compact than the overlapping zone.

中文翻译：

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基于田口法和灰色关联分析的Inconel 625激光增材制造参数优化

为了提高Inconel 625熔覆层的成型质量，使其得到更广泛的应用。本文对激光功率、扫描速度、送粉率和重叠率等主要工艺参数的影响及其对 Inconel 625 样品激光增材制造工艺的表面粗糙度和宽度误差的影响进行了实验研究。采用田口法和灰色关联分析法对所选参数进行优化，并进行验证试验。采用显微硬度计和扫描电镜(SEM)研究了熔覆层重叠区和非重叠区显微硬度和显微组织的变化。结果表明，加工参数对表面粗糙度和宽度误差影响最显着的是重叠率，激光功率、扫描速度、送粉率和重叠率的最佳水平为1800 W、8 mm/s、10 g/min 和 30%，分别。显微组织和成分分析表明，Laves 相和基体中 Cr 含量均较高，Laves 相中 Nb 含量显着增加，达到 24.48 wt%，且非重叠区的 Laves 更致密。重叠区。