张连旺,牛伟,孙荣禄,左润燕,谷米,马世忠.热处理对激光熔覆CoCrFeNiSi2.0高熵合金涂层组织与性能的影响[J].表面技术,2022,51(12):340-349.
ZHANG Lian-wang,NIU Wei,SUN Rong-lu,ZUORun-yan,GU Mi,MAShi-zhong.Effect of Heat Treatment on Microstructure and Properties of Laser Cladding CoCrFeNiSi2.0 High Entropy Alloy Coating[J].Surface Technology,2022,51(12):340-349 |
| 热处理对激光熔覆CoCrFeNiSi2.0高熵合金涂层组织与性能的影响 |
| Effect of Heat Treatment on Microstructure and Properties of Laser Cladding CoCrFeNiSi2.0 High Entropy Alloy Coating |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.12.035 |
| 中文关键词: 热处理 激光熔覆 Si 高熵合金 显微组织 显微硬度 耐磨损性能 |
| 英文关键词:heat treatment laser cladding Si high-entropy alloy macromorphology microhardness wear resistance |
| 基金项目:国家自然科学基金项目(51371125) |
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| Author | Institution |
| ZHANG Lian-wang | School of Mechanical Engineering, Tiangong University, Tianjin 300387, China |
| NIU Wei | School of Mechanical Engineering, Tiangong University, Tianjin 300387, China;Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tianjin 300387, China |
| SUN Rong-lu | School of Mechanical Engineering, Tiangong University, Tianjin 300387, China;Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tianjin 300387, China |
| ZUORun-yan | School of Mechanical Engineering, Tiangong University, Tianjin 300387, China |
| GU Mi | School of Mechanical Engineering, Tiangong University, Tianjin 300387, China |
| MAShi-zhong | School of Mechanical Engineering, Tiangong University, Tianjin 300387, China |
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| 中文摘要: |
| 目的 探究热处理温度对激光熔覆CoCrFeNiSi2.0高熵合金组织、物相、显微硬度及摩擦磨损性能的影响，为研究提高高熵合金性能的工艺流程提供参考。方法 采用激光熔覆技术制备了CoCrFeNiSi2.0高熵合金，利用高温炉加热方法对制得涂层进行不同温度(热处理温度分别为600、800、1 000 ℃)的热处理，30 min分别升温至600、800、1 000 ℃，保温30 min，后随炉冷却至室温。采用显微硬度仪、真空摩擦磨损试验机、Leica DVM6光学显微镜、扫描电镜(SEM)、X射线衍射仪(XRD)等设备对涂层的显微硬度、摩擦磨损性能、显微组织、物相组成进行分析研究。结果 未经热处理原始试样高熵合金涂层物相组成主要为BCC相，同时夹杂少量的(Fe,Mn)2SiO4相，经过不同温度的热处理后，(Fe,Mn)2SiO4逐渐分解，1 000 ℃热处理后完全消失;Cr2Si、Ni4Si相析出且在一定温度范围内随热处理温度上升含量逐渐增加，BCC相衍射峰高度随着热处理温度的增加先升高后降低。结论 热处理温度不同会影响涂层综合性能的改变，热处理温度为800 ℃时合金的综合性能优于原始试样涂层，内部组织较为均匀，Cr2Si、Ni4Si等析出相含量最多且均匀分布在晶界处，涂层显微硬度最高达1 347.4HV0.3，摩擦因数基本稳定在0.19。当热处理温度达到1 000 ℃时，CoCrFeNiSi2.0高熵合金涂层呈单一的BCC相，这势必会对涂层性能产生一定影响。 |
| 英文摘要: |
| It is a relatively novel way to improve the properties of coating by Laser cladding on 45# steel by heat treatment,the properties of the coating were improved by the transformation of microstructure phase composition of the sample after heat treatment at a certain temperature,such as wear resistance microhardness and other properties. Different samples were heated to different temperatures with the same heating method, and kept at different temperatures for the same time, then cooled to room temperature with the furnace. In this process, the degree of coating phase transformation is also different due to the different heating temperature,which just reflects that the improvement degree of coating performance is also different. The wear resistance and microhardness of the coating before and after heat treatment were studied in this article. The 45# steel with dimensions of 50 mm× 50 mm× 7 mm and 25 mm×50 mm×7 mm is prepared by wire cutting as multi-channel and single channel substrate. The surface of the substrate to be coated is grinded by grinding wheel, polished with sandpaper to remove oxide scale, and cleaned with absolute ethanol and acetone to remove surface dirt. CoCrFeNiSi2.0 high entropy alloy coating was prepared by RFL-C1000 laser machine.The high-temperature furnace is heated to different temperatures (600 ℃, 800 ℃ and 1 000 ℃) for 30 minutes, which shall be kept at different temperatures for 30 minutes, and then cooled to room temperature with the furnace. Cut the sample with wire cutting and polish the cross section, and corrode it with Saturated ferric chloride hydrochloric acid etchant. Then, observe the microstructure of the cladding layer by scanning electron microscope (ZEISS Sigma300). The component is analyzed by the EDS spectrum of each selected point taken by an energy spectrometer (ZEISS Sigma300). Analyze the phase composition of the coating by an X-ray diffractometer (Bruker D8) and test the microhardness of the cladding layer by microhardness tester (HV-1000Z).The friction test is performed on a high speed rotating grinding wheel and wear tester (M-2000), Calculate the wear weight and observe the surface morphology after wear. The high entropy alloy coating of the original sample without heat treatment is mainly composed of BCC phase and a small amount of (Fe,Mn)2SiO4 phase. With the increase of annealing temperature, (Fe,Mn)2SiO4 gradually decomposes, Cr2Si, Ni4Si phases are precipitated and the content gradually increases with the temperature rise within a certain temperature range. The height of the diffraction peak of BCC phase increases first and then decreases with the increase of heat treatment temperature. Different heat treatment temperatures will affect the change of overall performance of the coating. The increase of Cr2Si, Ni4Si phase content is the main reason for the performance improvement of coating. When the heat treatment temperature is at 800 ℃, the overall performance of the alloy is better than that of the original sample coating. As a result, The microhardness of the coating is up to 1 347.4HV0.3, and the friction coefficient is basically stable at 0.19. The high entropy alloy coating is annealed at 1 000 ℃, the internal phase composition of high entropy alloy coating is a single BCC phase, which is bound to have a certain impact on the performance of the coating. |
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