| JIANG Zitao,YANG Kang,XIN Yue,YI Xinlin,ZHANG Shihong,WANG Shuoyu,NI Zhenhang.Effect of Annealing Treatment on Friction and Wear Properties of Cr3C2-FeCrBSi Coatings[J],53(1):65-77 |
| Effect of Annealing Treatment on Friction and Wear Properties of Cr3C2-FeCrBSi Coatings |
| Received:October 30, 2022 Revised:May 20, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.01.006 |
| KeyWord:HVAF cold roll annealing friction and wear contact fatigue |
| Author | Institution |
| JIANG Zitao |
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education, Anhui University of Technology, Anhui Ma'anshan , China |
| YANG Kang |
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education, Anhui University of Technology, Anhui Ma'anshan , China |
| XIN Yue |
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education, Anhui University of Technology, Anhui Ma'anshan , China |
| YI Xinlin |
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education, Anhui University of Technology, Anhui Ma'anshan , China |
| ZHANG Shihong |
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education, Anhui University of Technology, Anhui Ma'anshan , China |
| WANG Shuoyu |
Anhui Ma Steel Surface Technology Co., Ltd., Anhui Ma'anshan , China |
| NI Zhenhang |
Anhui Ma Steel Surface Technology Co., Ltd., Anhui Ma'anshan , China |
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| Abstract: |
| High Velocity Air Fuel (HVAF) technology is a coating preparation method with operating temperature between the range for High Velocity Oxygen Fuel (HVOF) technology and Cold Spray (CS) technology. Therefore, it can reduce the thermal effect on the spray particles while ensuring their fully melted. Cermet prepared by thermal spraying is usually used for surface protection of parts because of its advantages of high hardness and good bonding strength. However, HVOF technology will lead to the inevitable decomposition of ceramic phase and affect the quality of coating. Therefore, the work aims to use the HVAF technology with lower calorific value to prepare Cr3C2-FeCrBSi according to the background of cold roller protection for a series of characterization. Considering the particle size, the content of ceramic powder and the effect of annealing on coating properties, micron and submicron Cr3C2 powders were added into FeCrBSi to prepare coatings with different ceramic contents. The wear resistance of composite coatings before and after annealing was studied. The D2 alloy steel was cut into 100 mm×30 mm×6 mm rectangular blocks and ϕ25 mm×55 mm cylindrical blocks. Cr3C2 (Micron:Submicron = 1∶1) in different ratios (5wt.%, 10wt.%, 15wt.%) was added to FeCrBSi as the reinforcing phase. The Cr3C2-FeCrBSi coating was prepared by mechanically mixing the metal and ceramic particles using HVAF on the substrate. The surface and cross-section of the samples were polished after they were cut into 15 mm×15 mm×6 mm blocks by wire cutter. Then, the microscopic morphology and elemental distribution were analyzed by scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS). The porosity was measured through a 500× magnification of the cross-section. The phase composition was analyzed with X-ray energy dispersive spectrometer (XRD). The microhardness was measured with a microhardness tester and the fracture toughness was calculated by equation. The bond strength was tested by tensile method. The three-dimensional wear morphology and wear volume of the coating were measured by probe contact profiler. Finally, the coating with the best ceramic content was annealed at 600 ℃, 700 ℃, and 800 ℃ for 3 h, and then the characterization methods were repeated to determine the effect of annealing treatment on friction and wear properties. The microhardness and bond strength of the coating increased firstly and then decreased with the increase of Cr3C2 content. When the ceramic phase content was 10wt.%, the microhardness and bond strength were 459.6HV0.3 and 42.8 MPa, respectively. The microhardness, fracture toughness and abrasion resistance of Cr3C2 (10wt.%)-FeCrBSi coating were improved after annealing. The average coefficient was reduced from 0.89 to 0.80-0.75. After annealing at 700 ℃ for 3 h, the microhardness reached 490.3HV0.3, the fracture toughness increased from 2.81 MPa∙m1/2 to 3.15 MPa∙m1/2, and the wear rate was 6.80×10‒14 m3/(N.m). Compared with as-sprayed coating, the wear rate was reduced by 15%. The wear mechanism was abrasive wear. At the same time, the contact fatigue life of the coating was longer under the condition of peeling failure, which could reach 2.07×105 revolutions. Annealing treatment could improve the stress and defects of Cr3C2-FeCrBSi coating and improve the overall performance. After annealing at 700 ℃ for 3 h, the secondary carbides in the coating were precipitated and the pores shrank, which made the coating show the best friction and wear properties. In addition, the contact fatigue failure of composite coatings takes the form of spalling and delamination. |
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