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| Zr702表面激光熔覆FeCrAl涂层微观组织及性能研究 |
| Microstructure and Properties of Laser Cladding FeCrAl Coating on Zr702 Surface |
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| DOI：10.3969/j.issn.1674-6457.2023.04.019 |
| 中文关键词: 激光熔覆 FeCrAl 显微硬度 磨损性能 高温氧化 工艺参数 |
| 英文关键词: laser cladding FeCrAl microhardness wear resistance high-temperature oxidation process parameters |
| 基金项目:国家自然科学基金(U1810112);山西省留学基金管理委员会科研项目(2021?126) |
| Author Name | Affiliation | | CHEN Ning-jie | School of Materials Science and Engineering, North University of China, Taiyuan 030051, China | | LI Yu-xin | School of Materials Science and Engineering, North University of China, Taiyuan 030051, China | | ZHANG Jing | School of Materials Science and Engineering, North University of China, Taiyuan 030051, China | | LI Ri-bang | School of Materials Science and Engineering, North University of China, Taiyuan 030051, China | | TIAN Miao | School of Materials Science and Engineering, North University of China, Taiyuan 030051, China |
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| 中文摘要: |
| 目的 优化激光熔覆工艺参数，制备综合性能良好的FeCrAl涂层，提高Zr702基体的表面性能。方法 通过同轴送粉方式，利用激光熔覆技术在Zr702表面制备了FeCrAl涂层，采用配备能谱仪(EDS)的扫描电镜(SEM)、X射线衍射仪(XRD)、数字显微硬度计、高速往复摩擦试验机及马弗炉研究了不同激光功率(1 300、1 400、1 600、1 800 W)与扫描速度(7、8、9 mm/s)对FeCrAl涂层成型质量、显微硬度、耐磨性及抗高温空气氧化性能的影响。结果 从所制备涂层的宏观形貌及微观组织可以观察到，在激光功率为1 600W、扫描速度为9 mm/s时，涂层成型质量最好。显微硬度测试结果表明，随着激光功率和扫描速度的增大，显微硬度呈减小趋势，但涂层显微硬度均高于Zr702基体，平均显微硬度约为基体的2.70~3.78倍。耐磨性能测试结果表明，涂层的磨损量小于Zr702基体，在激光功率为1 600 W、扫描速度为7 mm/s时，磨损量最低。氧化结果表明，800 ℃氧化时涂层未表现出良好的防护作用，但在1 000 ℃氧化时，涂层样品皆表现出优于Zr702基体的抗高温空气氧化性能。结论 通过调整工艺参数，采用激光熔覆技术在Zr702表面制备FeCrAl涂层可改善Zr702基体的显微硬度、耐磨性及1 000 ℃下的抗高温空气氧化性能。 |
| 英文摘要: |
| The work aims to optimize the laser cladding process parameters to prepare FeCrAl coatings with good comprehensive properties and improve the surface properties of Zr702 substrate. A FeCrAl coating was prepared on the surface of Zr702 by laser cladding with the coaxial powder feeding method. The effects of different laser power (1 300, 1 400, 1 600, 1 800 W) and scanning speed (7, 8, 9 mm/s) on the formation quality, microhardness, wear resistance and high-temperature air oxidation resistance of the FeCrAl coating were studied by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), digital microhardness tester, high-speed reciprocating friction testing machine and muffle furnace. From the macroscopic morphology and microstructure of the prepared coating, it could be observed that when the laser power was 1 600 W and the scanning speed was 9 mm/s, the formation quality of the coating was the best. The microhardness test results showed that the microhardness decreased with the increase of laser power and scanning speed, but the microhardness of the coating was higher than that of the Zr702 substrate, and the average microhardness was about 2.70-3.78 times of that of the substrate. The wear resistance test results showed that the wear amount of the coating was less than that of the Zr702 substrate, and the wear amount was the lowest when the laser power was 1 600 W and the scanning speed was 7 mm/s. The oxidation results showed that the coating did not exhibit a good protective effect when oxidized at 800 ℃, but the coating sample exhibited better high-temperature air oxidation resistance than the Zr702 substrate when oxidized at 1 000 ℃. By adjusting the process parameters, the FeCrAl coating prepared on the surface of Zr702 by laser cladding technology can improve the microhardness, wear resistance, and high-temperature air oxidation resistance of the Zr702 substrate at 1 000 ℃. |
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