| HUANG Guangcan,GUO Chun,LI Yun,CHEN Linting,LI Wenqing,CHEN Yanyan,ZHANG Xinyu,LIN Qingcheng.Effect of Y2O3 Addition on Microstructure Properties of FeCoNiCuAl High-entropy Alloy Coatings Prepared by Laser Cladding[J],53(15):163-172 |
| Effect of Y2O3 Addition on Microstructure Properties of FeCoNiCuAl High-entropy Alloy Coatings Prepared by Laser Cladding |
| Received:June 15, 2023 Revised:January 15, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.15.015 |
| KeyWord:laser cladding high-entropy alloys Y2O3 mechanical performance microstructures corrosion resistance |
| Author | Institution |
| HUANG Guangcan |
College of Mechanical Engineering, Anhui Science and Technology University, Anhui Fengyang , China |
| GUO Chun |
College of Mechanical Engineering, Anhui Science and Technology University, Anhui Fengyang , China |
| LI Yun |
College of Mechanical Engineering, Anhui Science and Technology University, Anhui Fengyang , China |
| CHEN Linting |
Anhui Yuchen Laser Technology Co., Ltd., Anhui Bengbu , China |
| LI Wenqing |
College of Mechanical Engineering, Anhui Science and Technology University, Anhui Fengyang , China |
| CHEN Yanyan |
College of Mechanical Engineering, Anhui Science and Technology University, Anhui Fengyang , China |
| ZHANG Xinyu |
College of Mechanical Engineering, Anhui Science and Technology University, Anhui Fengyang , China |
| LIN Qingcheng |
College of Mechanical Engineering, Anhui Science and Technology University, Anhui Fengyang , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to investigate the effect of different mass fractions of Y2O3 on the preparation of FeCoNiCuAl high-entropy alloy coatings by laser melting. The high entropy alloy coating of FeCoNiCuAl-xY2O3 (x=0%, 5%, 10%, 15%, 20%) was prepared on the surface of 45 steel substrate with a laser melting equipment consisting of IPG-4000 W laser and KUKA robot. The Y2O3 and FeCoNiCuAl powders were weighed and mixed uniformly with an electronic balance according to the experimental protocol, and the test specimens were prepared by pre-set powder feeding. The test specimens were cut into pieces with an EDM wire cutter, and the test specimens were polished with fine to coarse sandpaper to remove surface impurities and oxidation layer, and cleaned with anhydrous ethanol after polishing. The metallographic specimens were corroded with aqua regia and the microstructure of the coating was observed with a 4 XC microscope. The results showed that the microstructure of the FeCoNiCuAl high-entropy alloy coating consisted of equiaxed crystals and dendrites, and the microstructure of the coating with the addition of 5% Y2O3 by mass was dense dendrites; the composition of the coating phases was analyzed and investigated with a Pulitzer XD-3 X-ray diffractometer. The results showed that the addition of Y2O3 did not significantly change the composition of the coating phases, and the composite coating phases of Y2O3 and FeCoNiCuAl high-entropy alloy mainly consisted of γ-Fe solid solution, Cu2O, AlNi, Al5CO2, and Fe2O3; The microhardness of the coating was measured by HV1000 Z Vickers hardness tester. The results showed that the microhardness of the coating with Y2O3 was higher than that of the coating without the reinforced phase and the coating with the reinforced phase. The average microhardness of the coating with the addition of Y2O3 was 675.1HV0.2, which was the highest due to the fine grain reinforcement brought by the addition of Y2O3, which improved the mechanical properties of the coating. The results showed that the wear rate of the coating with Y2O3 was 1.12×10−7 g/(N.m), which exhibited the best wear resistance; The wear morphology of the coating was observed with a ZEISS-EVO18 scanning electron microscope. The results showed that the wear mechanism of the coating without Y2O3 was abrasive wear. After the addition of Y2O3, the wear mechanism changed to adhesive wear; The coating was coated with Y2O3 using a CHI 660E electrochemical workstation. A three-electrode system was used to carry out Tafel curve and electrochemical impedance spectroscopy (EIS) test. The results showed that the coating impedance of 5% Y2O3 added by mass fraction was the largest. The larger the radius of curvature of the capacitive arc, the greater the charge transfer impedance; At the same time, the electrode potential was the most positive. The more negative electrode potential, the less corrosion resistance; The more positive electrode potential, the more corrosion resistance. It is concluded that the corrosion resistance of Y2O3 coating with 5wt.% is optimal. The addition of Y2O3 promotes the melt pool flow and makes the pores disappear gradually. So after adding Y2O3, the grain refinement becomes more dense, which obviously improves the internal defects of the organization, thus effectively enhancing the performance of the coating. Compared with the coating without the reinforced phase and the 45 steel substrate, the performance of the coating with the addition of Y2O3 is significantly improved. |
| Close |
|
|
|