| WANG Qiang,YANG Ju,NIU Wen-juan,SU Cheng-ming,QIU Dong,LI Yang-yang.Microstructure and Mechanical Properties of Fe-based TY-2 Alloy Coatings by High-speed Laser Cladding[J],50(7):66-73 |
| Microstructure and Mechanical Properties of Fe-based TY-2 Alloy Coatings by High-speed Laser Cladding |
| Received:November 08, 2020 Revised:January 20, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.07.005 |
| KeyWord:laser cladding high-speed laser cladding Fe-base TY-2 alloy coating microstructure mechanical properties |
| Author | Institution |
| WANG Qiang |
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an , China;Shaanxi Research Center of Metallurgical Engineering, Xi’an , China |
| YANG Ju |
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an , China |
| NIU Wen-juan |
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an , China |
| SU Cheng-ming |
Shaanxi Tianyuan Intelligent Remanufacturing Co., Ltd, Xi'an , China |
| QIU Dong |
Center for Additive Manufacturing, School of Engineering, RMIT University, Melbourne 3053, Australia |
| LI Yang-yang |
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an , China |
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| Abstract: |
| The work aims to explore the microstructure and mechanical properties of high-speed laser cladding Fe-based TY-2 alloy coatings, compared with the conventional laser cladding. The Fe-base TY-2 alloy coating was prepared on 27SiMn steel substrate by high-speed laser cladding technique. The scanning electron microscope, X-ray diffractometer and microhardness tester were used to analyze the microstructure, phase structure and mechanical properties of the high-speed laser cladding coating and laser cladding coating. Compared with the coating of laser cladding, the coating of high-speed laser cladding was uniformly dense, without cracks, with fewer impurities, and demonstrated a good metallurgical bonding with the substrate. The microstructure of the laser cladding coating was composed of mainly columnar crystal, while high-speed laser cladding coating consisted of mainly fine grain with the size of 5~10 μm. The phase of high-speed laser cladding coating was consistent with the original powder, including (Fe,Ni), Cr0.19Fe0.7Ni0.11, Fe-Cr, etc. Whereas, the phase of laser cladding coating differed from the original powder, and the high energy density led to the formation of CaNi3C0.5 intermetallic compounds. The average hardness of high-speed laser cladding coating was 604HV0.3, which is 9.4% higher than that of laser cladding coating (543HV0.3). The total energy of high-speed laser cladding is relatively low, accounting for 77.9% of the total energy of laser cladding, and the kinetic energy carried by high-speed particles accounts for 17.7% of the total energy of high-speed laser cladding. High-speed laser cladding can achieve high-efficiency cladding at low energy and obtain finer microstructure, more uniform composition, and higher hardness. |
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