李永凤,刘美芹,王丽霞,李小颖,吴宁,章健.Cr3C2含量对Fe0.5CoCr0.5Mo0.3Ni高熵合金重熔涂层组织性能的影响[J].表面技术,2024,53(21):176-186.
LI Yongfeng,LIU Meiqin,WANG Lixia,LI Xiaoying,WU Ning,ZHANG Jian.Effect of Cr3C2 Content on Microstructure and Properties of Fe0.5CoCr0.5Mo0.3Ni High-entropy Alloy Remelting Coating[J].Surface Technology,2024,53(21):176-186 |
| Cr3C2含量对Fe0.5CoCr0.5Mo0.3Ni高熵合金重熔涂层组织性能的影响 |
| Effect of Cr3C2 Content on Microstructure and Properties of Fe0.5CoCr0.5Mo0.3Ni High-entropy Alloy Remelting Coating |
| 投稿时间：2024-04-16 修订日期：2024-07-05 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.21.018 |
| 中文关键词: 高熵合金涂层 物相组成 显微组织 显微硬度 耐磨性 耐腐蚀性 |
| 英文关键词:HEA coating phase composition microstructure microhardness wear resistance corrosion resistance |
| 基金项目:国家自然科学基金(52075047);泰山学者青年专家(tsqn202211245);山东省自然科学青年基金(ZR2021QE204) |
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| Author | Institution |
| LI Yongfeng | College of Mechanical and Electrical Engineering, Shandong University of Aeronautics, Shandong Binzhou 256600, China |
| LIU Meiqin | College of Mechanical and Electrical Engineering, Shandong University of Aeronautics, Shandong Binzhou 256600, China |
| WANG Lixia | College of Mechanical and Electrical Engineering, Shandong University of Aeronautics, Shandong Binzhou 256600, China |
| LI Xiaoying | Binzhou Special Equipment Inspection & Research Institute, Shandong Binzhou 256699, China |
| WU Ning | Binzhou Ecological Environment Service Center, Shandong Binzhou 256606, China |
| ZHANG Jian | College of Mechanical and Electrical Engineering, Shandong University of Aeronautics, Shandong Binzhou 256600, China |
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| 中文摘要: |
| 目的 研究Cr3C2对高熵合金涂层物相组成和组织的影响，提高涂层的耐磨性和耐腐蚀性，延长工件的使用寿命。方法 采用激光熔覆技术在45#钢表面制备Fe0.5CoCr0.5Mo0.3Ni-xCr3C2高熵合金(HEAs)复合涂层，并对其进行一次重熔处理。通过X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)、显微硬度计、摩擦磨损试验机和电化学工作站等设备研究涂层的物相组成、显微组织、显微硬度、耐磨性和耐腐蚀性能。结果 涂层主要由面心立方(FCC)相和(Cr, Fe)23C6相组成，FCC相作为主相，是由Fe-Co-Cr-Mo-Ni构成的高熵合金，(Cr, Fe)23C6作为加强相，与FCC形成共晶组织。Cr3C2加入量的改变会影响物相的组成、含量和显微组织的形貌，随着Cr3C2的增加，晶粒的形貌由粗大的树枝晶过渡到细小块状和圆柱状的枝状晶，且枝状晶的尺寸逐渐减小。Cr3C2的加入还会提高涂层的显微硬度，增加耐磨性，当Cr3C2加入量达到20%(质量分数)时，涂层的显微硬度从260HV0.2左右提高到430HV0.2，同时摩擦因数为0.45左右。该涂层同时具有最小自腐蚀电流密度和最高自腐蚀电位，分别为37.25 nA/cm2、–0.15 V，而未加Cr3C2的高熵合金涂层的自腐蚀电流密度为4 929.50 nA/cm2，自腐蚀电位为–0.55 V。结论 当涂层中Cr3C2的加入量不超过20%时，Cr3C2的加入量越大，生成的(Cr, Fe)23C6就越多，涂层的耐磨性越好。Cr3C2的加入还能够降低涂层的自腐蚀电流，提高自腐蚀电位，有利于耐腐蚀性的提高。 |
| 英文摘要: |
| High-entropy alloy (HEA) is an alloy formed by five or more main metal elements. Due to its many excellent properties, it has been widely concerned in the fields of material science and engineering application. However, the presence of a multitude of elements within these alloys can lead to the formation of brittle intermetallic compounds or intricate intermediate phases, such as the laves phase, which leads to the deterioration of the alloy properties. To expedite the industrial utilization of HEAs, it is imperative to refine their properties through various methods to enhance their performance and mitigate existing deficiencies. Drawn from metallurgical expertise, carbon and carbides are recognized for their pivotal role in modulating the properties of steel. It is anticipated that these elements will exert a substantial effect on the attributes of HEAs as well. It is concluded that carbon and carbide will also have a significant impact on the properties of HEAs. Therefore, the work aims to prepare HEAs-carbide composite coating by adding different contents of Cr3C2 to Fe0.5CoCr0.5Mo0.3Ni HEAs, and discuss the effects of Cr3C2 on the phase composition, microstructure, microhardness, wear resistance and corrosion resistance of the coating. Before coating fabrication, the powder with the ratio of Fe0.5CoCr0.5Mo0.3Ni-xCr3C2 (x = 0%, 7.5%, 10%, 20%) was mechanically mixed by planetary ball mill and preset on the polished 45# steel plate. The coating was prepared by 3 kW laser cladding equipment (LATEC LOM-3000) under the condition of 1.5 kW laser power, and remelted by 0.8 kW laser beam. The microhardness of cladding layer was measured by microhardness tester (HXD-1000TMC/LCD). The phase composition of different coatings was qualitatively analyzed by X-ray diffractometer (Bruker, D8 Advanced, XRD). The microstructure of the coating was observed by scanning electron microscope (Nova Nano 450 SEM), and the distribution of elements in the coating was quantitatively analyzed by energy dispersive spectrometer (EDS). Impedance and polarization curves were measured in 3.5% NaCl solution by electrochemical workstations (PASSTAT 2273 and CHI660E). The friction and wear properties of different coatings were tested by RETC friction and wear tester, and the three-dimensional morphology of wear marks was observed and compared by three-dimensional profilometer (BRUKER GTK-20-1045). The main phase of the coating was FCC HEAs phase with Fe-Co-Cr-Ni-Mo as the main element. With the increase of Cr3C2 content, the content of (Cr, Fe)23C6 in the coating gradually increased, while there was a small amount of M2C(M:Fe, Co, Mo) phase. The addition of Cr3C2 also changed the laves content, but the laves content was too small to be reflected in the XRD data. The microstructure of the coating without Cr3C2 was typical dendrite and reticular interdendritic structure, and a few columnar crystals were also found. With the increase of Cr3C2 content, the microstructure of the coating was gradually refined, and the morphology of the grain changed from coarse dendrite to fine block and cylindrical dendrite. In the process of laser cladding, Cr3C2 consumed laves phase to form (Cr, Fe)23C6 and M2C, which changed the microstructure in the coating and generated more acicular or lath-like structures. When Cr3C2 increased to 20%, because laves might be exhausted, acicular crystals grew in disorder and formed eutectic structure composed of carbide and FCC. With the increase of Cr3C2 content, more hard phases such as (Cr, Fe)23C6 and M2C (M:Fe, Co, Mo) were formed in the coating, which significantly improved the microhardness of the coating, reduced the friction and wear coefficient and improved the wear resistance of the coating. The addition of Cr3C2 also affected the electrochemical impedance and corrosion resistance of the coating. The coating with 20% Cr3C2 had the minimum self-corrosion current density and the highest self-corrosion potential, which were 37.25 nA/cm2 and –0.15 V respectively, and had the largest impedance curve radius and the largest impedance value. The addition of Cr3C2 will affect the phase composition, phase content, microstructure, morphology, wear resistance and corrosion resistance of Fe0.5CoCr0.5Mo0.3Ni coating. When the content of Cr3C2 is in the range of 0%-20%, the more Cr3C2, the better the wear resistance and corrosion resistance of the coating. The amount of Cr3C2 cannot be added indefinitely. Too high carbide content will increase the probability of cracks in the coating and reduce the mechanical properties. Therefore, the optimal amount of Cr3C2 will be further explored in the future study, and its effect on the mechanical properties of the coating will be studied. |
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