| Author Name | Affiliation | | Mengxian Li | Qingdao ADR Axles Manufacturing Co., Ltd, Shandong Qingdao 266400, China | | Zhiping Sun | School of Mechanical & Automotive Engineering, Qilu University of Technology Shandong Academy of Sciences, Jinan 250300, China | | Zhaomin Xu | School of Mechanical & Automotive Engineering, Qilu University of Technology Shandong Academy of Sciences, Jinan 250300, China | | Zhiming Wang | School of Mechanical & Automotive Engineering, Qilu University of Technology Shandong Academy of Sciences, Jinan 250300, China |
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| Abstract: |
| 21-4N (5Cr21Mn9Ni4N) is extensively employed in the production of engine valves, operating under severe conditions. Apart from withstanding high-temperature gas corrosion, it must also endure the impact of cylinder explosion pressure. The predominant failure mode of 21-4N valves is abrasive wear. Surface coatings serve as an effective approach to prevent such failures. In this investigation,Laser cladding technology was utilized to fabricate AlCoCrFeNiTi high entropy alloy coatings onto the surfaces of 21-4N valves. According to the findings, the cladding zone has a normal dendritic microstructure, a good substrate-to-cladding layer interaction, and no obvious flaws. In terms of hardness, the cladding demonstrates an average hardness of 620 HV. The hardness has increased by 140% compared to the substrate. The average hardness of the cladding remains at approximately 520 HV even at elevated temperatures. Regarding frictional wear performance, between 400 ℃ and 800 ℃, the cladding layer exhibits an average friction coefficient of 0.4, with the primary wear mechanisms being abrasive wear, adhesive wear, and a minor degree of plastic deformation. |
| Key words: high entropy alloy laser cladding microstructure microstructure and properties |
| DOI：10.11916/j.issn.1005-9113.23026 |
| Clc Number:TB31 |
| Fund: |
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| Descriptions in Chinese: |
| 激光熔覆制备AlCoCrFeNiTi高熵合金涂层的组织与性能研究 李梦贤1、孙治平2*、许兆敏2、王致明2 （1青岛爱迪尔车桥制造有限公司，青岛266400； 2齐鲁工业大学(山东科学院)机械与汽车工程学院，济南250300） 摘要:21-4N (5Cr21Mn9Ni4N)广泛用于生产发动机气门。气门的工作条件恶劣，除了承受高温气体腐蚀外，还必须承受气瓶爆炸压力的冲击。21-4N气门的主要失效形式是磨损。在气门表面制备涂层是防止磨损失效的有效方法。本研究采用激光熔覆技术在21-4N气门表面制备了AlCoCrFeNiTi高熵合金涂层。结果表明，熔覆区呈现典型的枝晶组织，基体与熔覆层界面良好，无明显缺陷。硬度方面，熔覆层区域的平均硬度为620 HV，比基体的硬度高2.4倍。即使在高温环境下，熔覆层的平均硬度仍保持在520 HV左右。就摩擦磨损性能而言，在400°C至800°C的温度范围内，熔覆层的平均摩擦系数为0.4，主要磨损机制为磨粒磨损、粘着磨损和较小程度的塑性变形。 关键词:高熵合金；激光熔覆；微观结构；微观结构和性能 |
