y2o3增强CoCrNi中熵合金高温耐磨耐蚀激光熔覆工艺参数优化

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-06-18 DOI:10.1016/j.surfcoat.2025.132412

Minsheng Hong, Ruifeng Li, Xiaolin Bi, Danlin Shao, Bin Liu

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引用次数: 0

摘要

研究了激光熔覆y2o3增强CoCrNi中熵合金涂层的工艺优化和性能调控。利用响应面法（RSM），我们建立了激光功率、扫描速度和粉末进料速度与关键涂层特性（稀释率、宽高比和熔覆面积）之间的预测模型。多目标优化得到最优参数：激光功率425.2 W，扫描速度581.9 mm/min，给粉速度8.76 g/min。实验验证表明，稀释率、纵横比和包层面积的预测误差分别为0.78%、8.22%和6.46%，证明了模型的可靠性。显微组织分析表明，该材料与316L基体有良好的金相结合。Y2O3的加入有效地细化了晶粒结构，形成了均匀的面心立方（FCC）单相固溶体。涂层在其横截面上具有一致的显微硬度（215.2-233.4 HV0.2）。450°C时的摩擦学测试表明，与316L基板相比，其磨损面积减少了75%，平均摩擦系数为0.8921，具有优异的高温耐磨性。电化学测量结果表明，该涂层的自腐蚀电流密度（2.28 × 10−5 mA/cm2）比316L衬底（3.39 × 10−5 mA/cm2）低33%。本研究建立了一种系统的激光熔覆制备高性能y2o3增强CoCrNi中熵合金涂层的方法，并提供了工艺优化策略和实验验证。

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Optimization of laser cladding parameters for Y2O3-reinforced CoCrNi medium-entropy alloy coatings with enhanced high-temperature wear and corrosion resistance

This study addresses the process optimization and performance regulation of laser-cladded Y₂O₃-reinforced CoCrNi medium-entropy alloy coatings. Using Response Surface Methodology (RSM), we developed predictive models correlating laser power, scanning speed, and powder feeding rate with key coating characteristics: dilution rate, aspect ratio, and cladding area. Multi-objective optimization yielded optimal parameters: laser power of 425.2 W, scanning speed of 581.9 mm/min, and powder feeding rate of 8.76 g/min. Experimental validation confirmed minimal prediction errors of 0.78 % for dilution rate, 8.22 % for aspect ratio, and 6.46 % for cladding area, demonstrating the model's reliability. Microstructural analysis revealed excellent metallurgical bonding with the 316L substrate. Y₂O₃ addition effectively refined grain structure, producing a homogeneous face-centered cubic (FCC) single-phase solid solution. The coating exhibited consistent microhardness (215.2–233.4 HV_0.2) across its cross-section. Tribological testing at 450 °C showed a 75 % reduction in wear area compared to 316L substrate, with a favorable average friction coefficient of 0.8921, indicating superior high-temperature wear resistance. Electrochemical measurements revealed enhanced corrosion resistance, with the coating's self-corrosion current density (2.28 × 10⁻⁵ mA/cm²) being 33 % lower than that of 316L substrate (3.39 × 10⁻⁵ mA/cm²). This work establishes a systematic approach for fabricating high-performance Y₂O₃-reinforced CoCrNi medium-entropy alloy coatings through laser cladding, providing both process optimization strategies and experimental validation.

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.