徐进,杨佳,陈兆建,汪成松,李冬明,宋涛,韩天.超高速激光熔覆CoCrFeNiMn高熵合金涂层的组织和耐磨性研究[J].表面技术,2025,54(3):152-161.
XU Jin,YANG Jia,CHEN Zhaojian,WANG Chengsong,LI Dongming,SONG Tao,HAN Tian.Microstructure and Wear Resistance of CoCrFeNiMn High Entropy Alloy Coating by Extreme-high Speed Laser Cladding[J].Surface Technology,2025,54(3):152-161 |
| 超高速激光熔覆CoCrFeNiMn高熵合金涂层的组织和耐磨性研究 |
| Microstructure and Wear Resistance of CoCrFeNiMn High Entropy Alloy Coating by Extreme-high Speed Laser Cladding |
| 投稿时间：2024-04-08 修订日期：2024-10-24 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.03.013 |
| 中文关键词: 超高速激光熔覆 高熵合金 显微组织 摩擦磨损 |
| 英文关键词:extreme-high speed laser cladding high entropy alloy microstructure friction and wear |
| 基金项目:工业和信息化部2023年深海超大型打桩设备主油缸用密封与关节轴承项目(2023ZY02007) |
| 作者 | 单位 |
| 徐进 | 江苏恒立液压股份有限公司，江苏 常州 213167 |
| 杨佳 | 中交第二航务工程局有限公司，武汉 430048 |
| 陈兆建 | 江苏恒立液压股份有限公司，江苏 常州 213167 |
| 汪成松 | 江苏恒立液压股份有限公司，江苏 常州 213167 |
| 李冬明 | 江苏恒立液压股份有限公司，江苏 常州 213167 |
| 宋涛 | 江苏恒立液压股份有限公司，江苏 常州 213167 |
| 韩天 | 江苏大学 机械工程学院，江苏 镇江 212013 |
|
| Author | Institution |
| XU Jin | Jiangsu Hengli Hydraulic Co.Ltd., Jiangsu Changzhou 213167, China |
| YANG Jia | CCCC Second Harbor Engineering Co.Ltd., Wuhan 430048, China |
| CHEN Zhaojian | Jiangsu Hengli Hydraulic Co.Ltd., Jiangsu Changzhou 213167, China |
| WANG Chengsong | Jiangsu Hengli Hydraulic Co.Ltd., Jiangsu Changzhou 213167, China |
| LI Dongming | Jiangsu Hengli Hydraulic Co.Ltd., Jiangsu Changzhou 213167, China |
| SONG Tao | Jiangsu Hengli Hydraulic Co.Ltd., Jiangsu Changzhou 213167, China |
| HAN Tian | School of Mechanical Engineering, Jiangsu University, Jiangsu Zhenjiang 212013, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 探究超高速激光熔覆技术对高熵合金的适用性。方法 使用超高速激光熔覆技术在Q355D基体上制备CoCrFeNiMn高熵合金涂层。分析不同熔覆速度下CoCrFeNiMn高熵合金涂层的显微组织、元素分布、显微硬度和磨损性能。结果 涂层内部呈现出多层堆叠结构，随着熔覆速度的增加，晶粒逐渐细化，晶粒尺寸降低，涂层厚度逐渐降低，3种涂层的厚度分别为395、342、244 μm。在涂层中，衍射峰的加宽可能是因熔覆过程中快速冷却引起了晶粒细化。涂层元素分布均匀，未发生明显偏析。由于涂层快速冷却，使其具有较低的稀释率。熔覆速度为40 m/min的涂层试样的显微硬度较高，其平均硬度达到240HV。同时，在该参数下，涂层的摩擦因数和磨损率均较低，分别为0.25和4.91×10−4 mm3/(N.m)。涂层的磨损机制呈现磨粒磨损与黏着磨损混合。结论 对于超高速激光熔覆技术，熔覆速度增加所带来的细小晶粒组织和高密度晶界有效增强了CoCrFeNiMn高熵合金涂层的抗变形能力，从而有效提升了涂层的耐磨性能。 |
| 英文摘要: |
| Modern engineering applications are constantly striving to develop mechanical components with higher performance, better microstructure stability and corrosion resistance, and lower maintenance and repair costs. This requires the widespread use of advanced high-performance materials, such as high entropy alloys (HEAs). HEAs, characterized by an equimolar or approximately equimolar composition of five or more metallic elements, represent a unique class of alloys. Approximately 5%-35% of alloying elements are present in HEAs. HEAs are mainly characterized by high entropy, slow diffusion, severe lattice distortion, and cocktail effect. Due to the advanced microstructure stability, HEAs exhibit better mechanical properties at room temperature, low temperature, and high temperature over a larger temperature range and longer periods of time. The CoCrFeNiMn alloy is a representative example of HEAs, exhibiting superior mechanical properties, corrosion resistance, and wear resistance. Consequently, the fabrication of CoCrFeNiMn protective coatings holds significant potential across various applications. To overcome the limitations of traditional laser cladding processes, the extreme-high speed laser cladding (EHLA) technology has been introduced by Schopphoven and colleagues. EHLA technology has resolved the efficiency challenges of conventional laser cladding methods and has enhanced the performance of the coatings, contributing to the cost-effective utilization of HEAS. In this study, CoCrFeNiMn HEA coatings were fabricated by EHLA at cladding speed of 20 m/min, 30 m/min, and 40 m/min. The phase composition of the powder and coatings were analyzed with an X-ray diffraction analyzer. The microstructures of the coatings were characterized with an optical microscope and a scanning electron microscope. Additionally, the elemental distribution within the coatings was determined with energy-dispersive X-ray spectroscopy. The microhardness of the coatings was measured with a Vickers hardness tester, and the surface friction and wear performance of the coatings were tested with an HT-1000 friction and wear testing machine. A well-formed CoCrFeNiMn HEA coating was successfully prepared by EHLA on the surface of Q355D steel. The test results indicated that the coating exhibited a multi-layered stacking structure, with a rich dendritic microstructure within the layers. As the cladding speed increased, the size and scale of the dendrites within the coating decreased, leading to a finer grain size. Under the effect of heat input, the grain size in the overlapping area slightly coarsened. However, due to the extremely small heat input of high-speed laser cladding on the solidified deposition layer, the degree and area of grain enlargement were very limited. The element distribution inside the coating was uniform without obvious segregation, which made the coating form a more stable and uniform structure, and have better performance. At a cladding speed of 40 m/min, the transition zone between the coating and the substrate was the narrowest, suggesting that an increased cladding speed effectively reduced the dilution rate of the coating. The hardness of the coatings increased with the cladding speed, thereby enhancing the wear resistance. Moreover, the friction and wear coefficients, as well as the wear rates, decreased with the increasing cladding speed. The wear mechanism of the coatings was a combination of abrasive and adhesive wear. The refinement of the grain size and the increased grain boundary density due to the increasing cladding speed enhance the wear resistance of the coating. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号