Abstract

As an advanced additive manufacturing technology, laser cladding has become a research hotspot in the fields of rapid manufacturing and surface modification in recent years. The quality of the cladding layer directly depends on the choice of process parameters. In order to obtain high quality cladding layer, the effects of laser power, scanning speed, and powder feeding rate on the quality of JG-3 iron-based powder cladding layer were studied by interaction orthogonal experiments. Three-dimensional measurement laser microscopy (3D MLM) and variance analysis were used to analyze the results. It was found that the interaction between laser power and powder feeding rate directly affects the optimum process parameters. Laser power 750 W, scanning speed 420 mm/min, and powder feeding rate 6.96 g/min were selected as the optimum process parameters. Scanning electron microscope (SEM), X-ray diffraction (XRD), and Thermo-Calc software were used to analyze the microstructure, phase composition, and solidification process of the coating, and compared with the experimental results. The results show that under the optimum process parameters, a dense crack-free and non-porous coating was obtained. The coating can be divided into three areas: coating zone (CZ), bonding zone (BZ), and heat affected zone (HAZ). The CZ is composed of α-Fe, Cr₂B, Fe₂B, and Cr₂₃C₆ phases. The calculated results obtained from the Thermo-Calc software are in good agreement with the experimental data. It is beneficial to the coating design for a desirable microstructure and mechanical properties.

中文翻译：

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激光熔覆JG-3粉末的工艺参数和涂层分析的交互式优化

摘要

激光熔覆作为一种先进的增材制造技术，近年来已成为快速制造和表面改性领域的研究热点。包层的质量直接取决于工艺参数的选择。为了获得高质量的熔覆层，通过正交试验研究了激光功率，扫描速度和送粉速度对JG-3铁基粉末熔覆层质量的影响。使用三维测量激光显微镜（3D MLM）和方差分析来分析结果。已经发现，激光功率和粉末进料速度之间的相互作用直接影响最佳工艺参数。最佳工艺参数选择为750 W激光功率，420毫米/分钟的扫描速度和6.96克/分钟的粉末进给速度。用扫描电子显微镜（SEM），X射线衍射（XRD）和Thermo-Calc软件分析了涂层的微观结构，相组成和固化过程，并与实验结果进行了比较。结果表明，在最佳工艺参数下，可获得致密的无裂纹无孔涂层。涂层可分为三个区域：涂层区（CZ），粘合区（BZ）和热影响区（HAZ）。CZ由 涂层可分为三个区域：涂层区（CZ），粘合区（BZ）和热影响区（HAZ）。CZ由 涂层可分为三个区域：涂层区（CZ），粘合区（BZ）和热影响区（HAZ）。CZ由α -Fe，Cr ₂ B，Fe ₂ B和Cr ₂₃ C ₆相。从Thermo-Calc软件获得的计算结果与实验数据非常吻合。对于期望的微观结构和机械性能的涂层设计是有益的。