Microstructure and tribological performance of WC-Co cermet strengthened nickel alloy composite coatings manufactured by extreme high-speed laser cladding (EHLA)

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

Surface & Coatings Technology Pub Date : 2025-06-16 DOI:10.1016/j.surfcoat.2025.132390

Bruno F.A. Bezerra , Samuel Pinches , Hannah J. King , Shareen S.L. Chan , Ashok Meghwal , Sukhpreet Kaur , Colin Hall , Christopher C. Berndt , Andrew S.M. Ang

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Abstract

Composite coatings composed of blended nickel alloy (IN625) and WC-Co cermet were applied via the extreme high-speed laser cladding (EHLA) process to investigate its feasibility as a coating replacement for hard chrome plating. A range of laser powers was investigated. These cermet coatings were benchmarked against an IN625-only coating, in the analysis of their macrostructure, microstructure, phase composition, Vickers microhardness and sliding wear resistance by the pin-on-disc test. The EHLA process resulted in crack-free coatings, with a good metallurgical bonding to the substrate and homogenous distribution of cermet particles within the coatings. The microhardness of the EHLA composite coatings increased by 81–102 % as compared to the IN625 EHLA coating. The wear rates of the composite coatings were only 0.5–1.4 % that of the IN625 coating, and only 1–4 % that of hard chrome coating. A decrease in laser power demonstrated an increase in the carbide-occupied cross-sectional area from 11.2 % to 17.2 %, which corresponded to a 64 % enhancement in wear resistance. This study highlights the critical balance required between laser power, carbide area fraction and microstructural characteristics, on the performance of EHLA-deposited composite coatings.

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超高速激光熔覆WC-Co陶瓷强化镍合金复合涂层的显微组织和摩擦学性能

采用超高速激光熔覆（EHLA）工艺，对镍合金（IN625）与WC-Co金属陶瓷复合镀层进行了研究，探讨了其替代硬铬镀层的可行性。研究了激光功率的范围。通过销盘式测试，对这些陶瓷涂层的宏观组织、微观组织、相组成、维氏显微硬度和滑动耐磨性进行了分析，并与纯in625涂层进行了基准测试。EHLA工艺使涂层无裂纹，与基体有良好的冶金结合，涂层内金属陶瓷颗粒分布均匀。与IN625 EHLA涂层相比，EHLA复合涂层的显微硬度提高了81 ~ 102%。复合涂层的磨损率仅为IN625涂层的0.5 ~ 1.4%，硬铬涂层的1 ~ 4%。激光功率的降低表明，碳化物占据的横截面积从11.2%增加到17.2%，这相当于耐磨性提高了64%。该研究强调了激光功率、碳化物面积分数和微观结构特征之间的临界平衡对ehla沉积复合涂层性能的影响。

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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.