文献类型：期刊文献

中文题名：基于灰色关联度-TOPSIS法的激光熔覆 Ni60/25%WC涂层工艺参数多目标优化及组织性能研究

英文题名：Multi-objective Optimization of Process Parameters, Microstructures and Properties of Laser Cladding Ni60/25%WC Coatings Based on Grey Relational Analysis-TOPSIS Method

作者：Lin, Yiming[1]; Chen, Dongdong[2]; Teng, Yuan[2]; Liu, Yanguo[2]; Zhang, Bingqing[1]; Wu, Lianquan[3]; Xue, Mingshan[2]; Shi, Wenqing[1,2]

机构：[1] School of Electronics and Information Engineering, Guangdong Provincial Key Laboratory of Intelligent Equipment for South China Sea Marine Ranching, Guangdong Ocean University, Guangdong, Zhanjiang, 524088, China; [2] School of Materials Science and Engineering, Guangdong Ocean University, Guangdong, Yangjiang, 529500, China; [3] Yangjiang Yichuan Metal Technology Co., Ltd., Guangdong, Yangjiang, 529533, China

年份：2026

卷号：55

期号：18

起止页码：130

外文期刊名：Surface Technology

收录：EI(收录号：20263921569514)

语种：中文

外文关键词：Composite coatings - Corrosion resistance - Corrosion resistant coatings - Corrosive effects - Electrochemical corrosion - Friction - Microhardness - Multiobjective optimization - Ships - Steel corrosion - Surface testing - Vickers hardness - Vickers hardness testing - Wear of materials - Wear resistance

外文摘要：The work aims to obtain a Ni60/25%WC coating with excellent performance. Due to its good comprehensive properties and low cost, Q355B steel is widely used in shipbuilding and construction. However, its surface is prone to wear and corrosion. Therefore, this work investigates the effect of laser cladding process parameters on the hardness, wear resistance and corrosion resistance of the Ni60/25%WC coating, and constructs a comprehensive optimization model combining grey relational analysis (GRA) and the TOPSIS method. Firstly, the weight of each index was determined via GRA normalization, and then TOPSIS was used for multi-objective evaluation to select the optimal process window. Q355B steel was used as the base material. The surface was sandpapered, then ultrasonically cleaned in absolute ethanol for 10 min, and finally dried with hot air. The Ni60 alloy powder and WC powder were mixed in a planetary ball mill at a mass ratio of 3 : 1, and then dried in an oven at 80 °C for 2 hours. The mixed powder was evenly spread and pressed onto the substrate surface to a pre-set thickness of approximately 1 mm. A laser cladding system (XL-F3000Y-2) was employed to fabricate the coatings. Nine sets of process parameters were designed, combining laser power (900, 1 200, 1 500 W) and scanning speed (300, 450, 600 mm/min). The defocus distance was fixed at +7, and the center distance between adjacent cladding tracks was fixed at 1.2 mm. The microhardness was measured with a Vickers hardness tester (MHVD-1000AT) under a load of 1.98 N and a dwell time of 10 s. The average of three measurements was taken as the result. The friction coefficient and the worn surface profile were tested with a disk-type friction and wear tester (SFT-2M). The electrochemical corrosion behavior was evaluated with an electrochemical workstation (Correst CS350M) equipped with a three-electrode system. The worn and corroded morphologies of the coatings were subsequently observed by scanning electron microscopy (Apreo2S) coupled with energy-dispersive spectroscopy (UltimMax65). Microhardness, wear volume, and corrosion current density were selected as the responses. The objective weight of each index was obtained through GRA. The optimal process parameters were evaluated and selected with the TOPSIS method, and the results were verified by the equal-weight method. Finally, the samples prepared under the optimal and the worst process schemes were characterized. The microstructure and elemental distribution were analyzed by SEM and EDS, and the phase composition was identified by X-ray diffraction (XRD-7000). A Ni60/25%WC composite coating was successfully prepared, and its comprehensive performance was evaluated. The changes in the microhardness, wear resistance, and corrosion resistance of the coating were analyzed. It was found that among the various process parameters, S3 (900 W, 600 mm/min) had the highest hardness, S6 (1 200 W, 600 mm/min) had the best wear resistance, and S5 (1 200 W, 450 mm/min) had the best corrosion resistance. To simultaneously optimize multiple performance indicators, this work adopts a combined method of GRA and TOPSIS for comprehensive evaluation. Through GRA, the weights of the wear volume, microhardness, and corrosion current density were objectively determined as 0.378, 0.313, and 0.309, respectively. The relative closeness of each scheme was calculated with the TOPSIS method. The results showed that laser power had a significant impact on the comprehensive performance of the coating. Excessively high power (1 500 W) caused matrix dilution and grain coarsening, resulting in a decline in overall performance. Finally, the process parameters yielding superior comprehensive performance were determined as a laser power of 1 200 W and a scanning speed of 450 mm/min, with a corresponding relative closeness (Ci) of 0.758. Microstructure analysis indicated that the coating prepared under these parameters presented a dense microstructure, mainly composed of γ-(Ni, Fe) solid solution and uniformly distributed hard phases, including Cr23C6, CrB, and W2C. Compared with the worst process condition (1 500 W, 600 mm/min), the optimal process has a significantly finer microstructure, exhibiting a higher microhardness (644.2HV0.2), better wear resistance (wear volume: 0.014 6 mm3), and superior corrosion resistance (corrosion current density: 8.02×10-6 A/cm2). ? 2026, Chongqing Wujiu Periodicals Press. All rights reserved.