任向宇,孙文磊,田爽,王秋雨.送粉速率对激光熔覆内壁FeCoNiCrMo0.2涂层组织及性能的影响[J].表面技术,2025,54(5):188-202.
REN Xiangyu,SUN Wenlei,TIAN Shuang,WANG Qiuyu.Effect of Powder Feeding Rate on Microstructure and Properties of Internal FeCoNiCrMo0.2 Coating by Laser Cladding[J].Surface Technology,2025,54(5):188-202 |
| 送粉速率对激光熔覆内壁FeCoNiCrMo0.2涂层组织及性能的影响 |
| Effect of Powder Feeding Rate on Microstructure and Properties of Internal FeCoNiCrMo0.2 Coating by Laser Cladding |
| 投稿时间：2024-05-27 修订日期：2024-10-24 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.05.015 |
| 中文关键词: 激光熔覆 高熵合金 微观组织 显微硬度 磨损行为 电化学腐蚀 |
| 英文关键词:laser cladding high entropy alloys microstructure microhardness tribological behaviors electrochemical corrosion |
| 基金项目:新疆维吾尔自治区重点研究项目(2022B01036);新疆维吾尔自治区科研创新项目(XJ2022G011) |
| 作者 | 单位 |
| 任向宇 | 新疆大学 机械工程学院，乌鲁木齐 830017 |
| 孙文磊 | 新疆大学 机械工程学院，乌鲁木齐 830017 |
| 田爽 | 新疆大学 机械工程学院，乌鲁木齐 830017 |
| 王秋雨 | 重庆市彭水民族中学，重庆 409600 |
|
| Author | Institution |
| REN Xiangyu | College of Mechanical Engineering, Xinjiang University, Urumqi 830017, China |
| SUN Wenlei | College of Mechanical Engineering, Xinjiang University, Urumqi 830017, China |
| TIAN Shuang | College of Mechanical Engineering, Xinjiang University, Urumqi 830017, China |
| WANG Qiuyu | Chongqing Pengshui Minzu Secondary School, Chongqing 409600, China |
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| 中文摘要: |
| 目的 改善石化领域管状内壁零件的抗磨损、抗腐蚀性能，延长零件的使用寿命。方法 使用激光熔覆技术在316L钢管内壁制备5种不同送粉速率下的FeCoNiCrMo0.2高熵合金(HEA)涂层。通过物相组成、晶粒结构、硬度测试、磨损试验，分别评价5种HEA涂层中固溶体的分布情况、微观组织细密程度，以及硬度和抗磨损抗犁切性能，并对磨损机制进行分析。最后利用动电位极化曲线表征HEA涂层的抗腐蚀性能。结果 HEA涂层由单相FCC构成，且其微观组织主要由柱状晶、胞状晶组成。涂层的磨损机制均包括黏着磨损和磨粒磨损。在送粉速率为15 g/min时，涂层形成了更多细密的胞状晶粒组织，增加了涂层中硬质相的含量，固溶强化效应较大，涂层的摩擦因数降至0.58，改善了HEA涂层的摩擦学性能。在电化学测试中，送粉速率为15 g/min时HEA涂层拥有最低的自腐蚀电流密度(Jcorr)，该涂层表面原位生成的钝化膜中含有更多的抗腐蚀性物质(例如Cr2O3等)。结论 送粉速率通过影响内壁HEA涂层的物相组成、组织演变和元素分布，显著提升了涂层的硬度和摩擦学性能。通过优化送粉速率，有助于降低HEA涂层的摩擦因数和磨损，也有助于增强涂层在腐蚀过程中形成钝化膜的密度，增大Cr2O3、MoO2等抗腐蚀性物质的含量。 |
| 英文摘要: |
| The work aims to improve the wear and corrosion resistance of tubular and inner wall parts (such as oil and gas transmission pipes) in petrochemical and other fields, and then extend the service life of parts. In this paper, high entropy alloy (HEA) coatings of FeCoNiCrMo0.2 were prepared by laser cladding at five different powder feeding rates on the inner surface of the 316L tube. Based on the macroscopic morphology, phase composition, grain structure, element distribution, hardness test, wear test and electrochemical corrosion characterization, the solid solution distribution, microstructure fineness, alloying element distribution, hardness and wear resistance of the five HEA coatings were evaluated, and the wear mechanism was analyzed. Finally, the corrosion resistance of HEA coatings were characterized by potentiodynamic polarization curve. The results showed that the five coatings were all composed of simple FCC phases, and the microstructure was mainly composed of columnar and cellular crystals. The microstructure of HEA coatings with 6 g/min and 18 g/min powder feeding rates were mainly composed of coarse columnar crystals, accompanied by a small amount of fine cellular crystals. The HEA coating at 6 g/min had the greatest dilution of 52% and had the greatest thermal impact on the substrate. Moreover, the HEA coating prepared at the powder feeding rate of 18 g/min contained obvious unmelted particles, and the forming quality was poor. The curves of coefficient of friction (COF) for 6, 9, 12, 15, 18 g/min were approximately stabilized at about 0.68, 0.65, 0.61, 0.58, and 0.63, respectively. The powder feeding rate of 15 g/min had a greater solid solution strengthening effect on the coating, and the solid solution was uniformly distributed. And the solidification of the coating at this time formed more fine cellular crystals, which reduced the elemental segregation during the solidification process and increased the hard phase content in the coating. In addition, the rate decreased the COF of the coating to 0.58, and its wear volume loss was 2.456 mg, which improved the tribological properties of the HEA coating. The wear mechanism of the five coatings included adhesive wear and abrasive wear. When the powder feeding rate was in the range of 12-15 g/min, the surface of the worn HEA coating was flat, and the wear depth was shallow. The wear morphology was characterized mainly by minor grooves caused by abrasive wear and a small amount of plastic deformation and spalling from adhesive wear. Moreover, in the electrochemical test, the self-corrosion current density of the HEA coatings reached a maximum of 1.02×10−6 A/cm2 at a powder feeding rate of 18 g/min. Compared with 6 g/min and 18 g/min, the Jcorr of the HEA coatings prepared at 9-15 g/min was reduced by 1-2 orders of magnitude, thus exhibiting excellent pitting resistance. The 15 g/min HEA coating had the lowest Jcorr value and the passivation interval with relatively large opening. The passivation film generated in-situ on the surface of the coating had more corrosion resistant substances, such as Cr2O3 and MoO2, which made it have relatively excellent corrosion resistance. Therefore, the FeCoNiCrMo0.2 coatings can significantly improve the tribological and electrochemical behaviors of the inner wall of 316L steel pipe, and achieve the purpose of strengthening the internal surface of the parts. Additionally, the powder feeding rate significantly affects the hardness and tribological properties of HEA coatings by influencing the phase composition, microstructure evolution and element distribution in the HEA coatings. The optimization of powder feeding rate helps to reduce the COF and wear loss of the HEA coating, and also helps to enhance the density of passivation film formed by the coating during corrosion, as well as increase the content of corrosion-resistant substances such as Cr2O3 and MoO2. |
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