| NI Xiao-jie,ZHANG Bo-wen,ZHAO Zhong-xian,WANG Sheng-ze,GU Hao-wen,HU Zhao-wei,LI Wen-ge.Investigation on the Microstructure and Properties of the Laser Cladded Mo2NiB2-Cr7C3 Composite Coatings[J],50(5):60-69 |
| Investigation on the Microstructure and Properties of the Laser Cladded Mo2NiB2-Cr7C3 Composite Coatings |
| Received:August 24, 2020 Revised:December 21, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.05.005 |
| KeyWord:laser cladding Mo2NiB2 laser parameters microstructure property |
| Author | Institution |
| NI Xiao-jie |
School of Mechanical Engineering, Donghua University, Shanghai , China |
| ZHANG Bo-wen |
Merchant Marine College, Shanghai Maritime University, Shanghai , China |
| ZHAO Zhong-xian |
Merchant Marine College, Shanghai Maritime University, Shanghai , China |
| WANG Sheng-ze |
School of Mechanical Engineering, Donghua University, Shanghai , China |
| GU Hao-wen |
Merchant Marine College, Shanghai Maritime University, Shanghai , China |
| HU Zhao-wei |
Merchant Marine College, Shanghai Maritime University, Shanghai , China |
| LI Wen-ge |
Merchant Marine College, Shanghai Maritime University, Shanghai , China |
|
| Hits: |
| Download times: |
| Abstract: |
| A wear-resistant and corrosion-resistant Mo2NiB2-Cr7C3 composite coatings were prepared on the substrate of 45# steel by laser cladding. The effects of laser cladding parameters including scanning rates of 3 and 4 mm/s and the addition of Cr7C3 particles on the microstructure and properties of the cladding coatings were investigated. The SEM, EDS, XRD, micro-hardness tester, friction and wear tester and electrochemical workstation were used to character the microstructure, composition and properties of the cladding coatings. Results showed that a fusion transition zone was appeared between the cladding coating and the substrate, consequently leading to a good metallurgical bond. The main phases in cladding coating were Mo2NiB2, Cr7C3 and {FeNi} phases. The Mo2NiB2 and Cr7C3 phases preferred gathering in the middle of the cladding coatings. And the laser scan rate of 3 mm/s brought in the increased content of {FeNi} phase in the coating. From top layer to bottom layer of the coating, the micro-hardness firstly increased and then decreased, in which the highest micro-hardness could reach more than 1300HV0.1, 6 times higher than that of 45# steel (220HV0.1). Compared with 45# steel, the cladding coatings possessed the lower friction coefficient and wear loss and better corrosion resistance. Especially, the Mo2NiB2-Cr7C3 coating prepared at 4 mm/s possessed the highest micro-hardness, the best wear resistance (friction coefficient of 0.66, scratch depth of 8.6 μm) and the best corrosion resistance (Jcorr is one order of magnitude lower than 45# steel). Therefore, the high laser scanning rate (4 mm/s) and the addition of Cr7C3 particles could effectively enhance the mechanical properties and corrosion resistance of the Mo2NiB2-Cr7C3 coatings, consequently fulfilled the surface modification of 45# steel. |
| Close |
|
|
|