Surface modification of AZ61 Magnesium Alloy with Stelcar Alloy Powder Using Laser Cladding Technique

Indian journal of science and technology Pub Date : 2024-04-03 DOI:10.17485/ijst/v17i14.187

G. B. Sathishkumar, B. Asaithambi, V. Srinivasan

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Abstract

Objective: To examine the tribological and mechanical characteristics of the AZ61 alloy reinforced with Stelcar alloy powder by surface modification through laser cladding. Methods: Surface modification was done by using a laser cladding machine, where the input parameters including Scanning Speed (SS), Laser Power (LP) and Powder Feed Rate (PFR) were adjusted. Experimental design followed a L9 Taguchi approach, and optimization of input parameters for the surface modified AZ61 alloy reinforced with Stelcar alloy particles was achieved using Grey Relational Analysis (GRA). Output responses, namely wear volume and micro hardness were measured to assess the effectiveness of the optimization process. Findings: From the results obtained through the experiments, powder feed rate contributes to 82.81% of the variability in wear volume, whereas the laser power mostly impacts micro hardness; influencing it by 89.46% confirmed with ANOVA. In order to determine the optimal processing parameters among various objectives, this research applies the grey relational method. The results showed that the wear volume and micro hardness of the composite were significantly affected by the Stelcar reinforcement. Employing Grey relational analysis combined with several optimization objectives into a transparent method, resulting in a clad material with the lower wear volume and higher micro hardness. The optimized processing parameters predicted grey relational grades with an error rate of 1.39% and a significant contribution of 63.60% from laser power. This study confirmed that multi-objective optimization could enhance laser-cladded surface mechanical characteristics and laid out the theoretical foundation for this approach. Novelty: This study introduces an innovative approach to surface modification by employing the laser cladding technique to reinforce Stelcar alloy particles, thereby creating a dense coating on the substrate. Keywords: Laser Cladding, AZ61 magnesium alloy, Stelcar alloy, Coating, Optimization

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利用激光熔覆技术用 Stelcar 合金粉末对 AZ61 镁合金进行表面改性

目的研究用 Stelcar 合金粉末通过激光熔覆进行表面改性后增强的 AZ61 合金的摩擦学和机械特性。方法：使用激光熔覆技术进行表面改性：使用激光熔覆机进行表面改性，调整输入参数，包括扫描速度（SS）、激光功率（LP）和粉末进给速率（PFR）。实验设计采用 L9 Taguchi 方法，并使用灰色关系分析法（GRA）对使用 Stelcar 合金颗粒强化的表面改性 AZ61 合金的输入参数进行了优化。测量了输出响应，即磨损量和显微硬度，以评估优化过程的有效性。研究结果从实验结果来看，粉末进给率占磨损量变化的 82.81%，而激光功率对显微硬度的影响最大；经方差分析证实，激光功率对显微硬度的影响为 89.46%。为了确定各种目标之间的最佳加工参数，本研究采用了灰色关系法。结果表明，复合材料的磨损量和显微硬度受到 Stelcar 增强材料的显著影响。灰色关系分析法将多个优化目标结合在一起，形成了一种透明的方法，从而使复合材料具有更低的磨损量和更高的显微硬度。优化后的加工参数预测灰色关系等级的误差率为 1.39%，而激光功率的贡献率高达 63.60%。这项研究证实了多目标优化可以提高激光熔覆表面的机械特性，并为这种方法奠定了理论基础。新颖性：本研究采用激光熔覆技术强化 Stelcar 合金颗粒，从而在基体上形成致密涂层，为表面改性引入了一种创新方法。关键词：激光熔覆激光熔覆 AZ61 镁合金 Stelcar 合金涂层优化

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Indian journal of science and technology

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