| 引用本文: | 曹佳俊,常成,邱兆国,曾德长,刘敏,闫星辰.AISI1045钢表面激光熔覆FeCoCrNiAl0.5Ti0.5涂层的界面特性及摩擦性能[J].中国表面工程,2023,36(2):54~64 |
| CAO Jiajun,CHANG Cheng,QIU Zhaoguo,ZENG Dechang,LIU Min,YAN Xingchen.Interface Characteristics and Tribological Properties of Laser Cladded FeCoCrNiAl0.5Ti0.5 Coating on AISI 1045 Steel[J].China Surface Engineering,2023,36(2):54~64 |
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| AISI1045钢表面激光熔覆FeCoCrNiAl0.5Ti0.5涂层的界面特性及摩擦性能 |
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曹佳俊1,2, 常成2, 邱兆国1, 曾德长1, 刘敏2, 闫星辰2
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1.华南理工大学材料科学与工程学院 广州 510640;2.广东省科学院新材料研究所现代材料表面工程技术国家工程实验室 广州 510651
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| 摘要: |
| 激光熔覆高熵合金涂层摩擦磨损行为的研究主要聚焦在涂层表面，鲜有对熔覆层 / 基体界面区域的摩擦学行为进行研究。为了提高 AISI 1045 钢的耐磨性，采用激光熔覆技术在 AISI 1045 钢基体表面制备宏观形貌良好、组织均匀的 FeCoCrNiAl0.5Ti0.5高熵合金涂层。利用 OM、XRD、SEM、EDS 和摩擦磨损测试仪对激光熔覆 FeCoCrNiAl0.5Ti0.5涂层的微观结构、物相组成、界面特性和摩擦磨损性能进行研究。通过对 FeCoCrNiAl0.5Ti0.5涂层 XRD 图谱和元素分布分析发现，涂层主要由面心立方(Fe，Ni)相和体心立方相(BCC)形成的共晶组织及其中弥散分布着的 NiAl 金属间化合物构成。硬度测试表明，从涂层顶部到基体，涂层、稀释区、热影响区和基体的平均显微硬度分别为 518±20、561±63、473±81 和 217± 12 HV0.2。涂层 / 基体界面区域生成了 Cr23C6，在摩擦过程中会形成一层摩擦层，相比于涂层和基体具有更小的摩擦因数(0.56)， 磨损率(4.76±0.51×10?5 mm3 / (N·m))最低，为涂层 / 界面区域摩擦学行为提供了理论参考。 |
| 关键词: 激光熔覆 高熵合金涂层 微观组织 界面特性 摩擦磨损 |
| DOI：10.11933/j.issn.1007?9289.20220524002 |
| 分类号:TG146 |
| 基金项目:广东省科学院建设国内一流研究机构行动专项(2021GDASYL-20210102005)、广东省基础与应用基础研究基金(2020A1515111031，2021A1515010939)、中国科协“青年人才托举工程”(YESS20210269)、广州市科技计划(202007020008，202102020327)和广东省科学院发展专项(2022GDASZH-2022010107)资助项目 |
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| Interface Characteristics and Tribological Properties of Laser Cladded FeCoCrNiAl0.5Ti0.5 Coating on AISI 1045 Steel |
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CAO Jiajun1,2, CHANG Cheng2, QIU Zhaoguo1, ZENG Dechang1, LIU Min2, YAN Xingchen2
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1.School of Materials Science & Engineering, South China University of Technology, Guangzhou 510640 , China;2.National Engineering Laboratory of Modern Materials Surface Engineering Technology,Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651 , China
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| Abstract: |
| AISI 1045 steel has good workability and exceptional comprehensive mechanical properties due to hardening and tempering, relying on a tempered sorbitic matrix. However, it is vulnerable to wear even after heat treatment when used in load-bearing applications. An appropriate fabrication method is urgently required to strengthen the surface properties of AISI 1045 steel. Laser cladding (LC), an advanced surface modification technique, has become a research hotspot owing to its adjustable processing parameters, ultrafast heating / cooling rate, and utilization of high-energy beams. It provides a method for the preparation of high-entropy alloy (HEAs) coatings on the surface of AISI 1045 steel to increase the surface wear resistance and hardness. Benefiting from the characteristics of HEAs and the merits of the LC process, the dense HEAs coating fabricated by LC has good metallurgical bonding on the substrate and generates a small amount of precipitation, such as intermetallic compounds, to strengthen the coating. At present, research on the wear of laser-cladding high-entropy alloy coatings mainly focuses on the coating surface, and the tribological behavior of the coating / substrate interface region has rarely been studied. A series of FeCoCrNiAl0.5Ti0.5 coatings with good macromorphology and uniform microstructure were fabricated on an AISI 1045 steel substrate using laser cladding technology to improve the wear resistance of AISI 1045 steel. The microstructure and phase distribution were investigated by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive spectroscopy (EDS). The coating consists of planar crystals, columnar dendrite crystals, and equiaxed crystals from the bottom to the top. The XRD pattern and elemental distribution of the FeCoCrNiAl0.5Ti0.5 coatings revealed that the coating was composed of a eutectic structure face-centered cubic phase (Fe, Ni), some body-centered cubic phase (BCC) and dispersed NiAl intermetallic compounds. In addition, hardening phases such as Cr23C6 and CoTi2 are formed when carbon is dissolved in the coating / substrate interface region, and the substrate is composed of fine lath martensite α'- (Cr, Fe). The microhardness and tribological properties of the coatings were tested using a Vickers hardness tester and a tribometer. From the top of the coatings to the substrate, the average microhardness of the coating, dilution area, heat-affected zone, and substrate were 518±20 HV0.2, 561±63 HV0.2, 473±81 HV0.2 and 217±12HV0.2, respectively. This shows a trend of first increasing and then decreasing due to the deposition of Cr23C6 in the dilution area and the depression of the quenching effect on the substrate. The wear tests showed that the mechanisms were abrasive wear on the substrate, a combination of adhesive and oxidative wear on the coating, and a combination of abrasive and oxidative wear on the coating / substrate interface region. During friction, the substrate produces a large amount of spalling and oxidation debris, followed by severe three-body wear. The coating formed a cycle of oxide film growth-crack-detaching, causing coating wear. Compared with the coating and substrate, the Cr23C6 and friction layer are formed in the coating / substrate interface region during the friction process to protect the interface region, which provides a theoretical reference for the tribological behavior of the coating / interface region. The coefficient of friction on the coating / substrate interface region (COF=0.56) and the wear rate (4.76±0.51×10?5 mm3 / (N·m)) were the lowest. The wear rate of the coating / substrate interface region is half that of the substrate, which is slightly lower than that of the coating. |
| Key words: laser cladding FeCoCrNiAl0.5Ti0.5 high entropy alloy coating microstructure interface characteristics |
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