| YANG Er-juan,LI Yong,LI Wei,LI Tai-jiang,LI Yi-chao,LIU Feng,MI Zi-hao,WANG Bo.Effect of WC Particle Content on Microstructure and Mechanical Properties of Laser Cladded NiCrBSi-WC Composite Coating[J],48(9):238-244 |
| Effect of WC Particle Content on Microstructure and Mechanical Properties of Laser Cladded NiCrBSi-WC Composite Coating |
| Received:February 25, 2019 Revised:September 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.09.027 |
| KeyWord:composite coating laser cladding WC particle microstructure hardness fracture toughness wear resistance |
| Author | Institution |
| YANG Er-juan |
1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an , China |
| LI Yong |
1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an , China |
| LI Wei |
1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an , China |
| LI Tai-jiang |
1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an , China |
| LI Yi-chao |
2.Huaneng Tibet Yarlung Zangbo River Hydropower Development Investment Co., Ltd, Lhasa , China |
| LIU Feng |
2.Huaneng Tibet Yarlung Zangbo River Hydropower Development Investment Co., Ltd, Lhasa , China |
| MI Zi-hao |
1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an , China |
| WANG Bo |
1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an , China |
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| Abstract: |
| The work aims to provide a new coating method for protecting component surface under severe wear conditions of high load during shielding, exploration, mining, etc. NiCrBSi/WC composite coating was prepared by laser cladding through adding 30%~80% spherical WC particles in NiCrBSi powders. Effect of the WC particle content on microstructure formation, hardness, fracture toughness and abrasive wear resistance was systematically investigated. Microstructure of coating was analyzed by SEM, hardness was tested by the Vickers hardness tester, the fracture toughness was investigated by indentation method and the wear resistance was characterized by abrasive wear test. When mass fraction or volume fraction of WC particle was lower than 60%, the viscosity of molten metal was lower, and WC particles with higher density precipitated, resulting in lower WC particle content in the coating surface layer. When the content of WC particles ranged from 60% to 80%, WC particles were uniformly distributed in the coating, and there were no defects such as pores and cracks in the coating. As mass fraction of WC particles increased to 80%, the melt viscosity was too high, which made it difficult for gas to escape in time and formed a large number of pores in the coating. As the WC mass fraction increased from 30% to 80%, the average hardness of the coating increased from 67HRC to 85HRC. The fracture toughness of the coating increased first and then decreased with the increase of WC content. The composite coating with 60%WC content showed the best wear resistance, which was about 9 times higher than that of H13 steel as the common hob material. When conventional laser cladding technology is adopted, a composite coating with uniform distribution of hard particles and excellent wear resistance and impact resistance can be obtained by adding hard ceramic particles in the range of 40%~60%. |
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