Microstructure and wear behavior of laser-textured and micro-alloyed Co-based WC and TiC composite sintered-carbide coating |
| |
| Authors: | Hongbin Liu Daping Wan Dejin Hu |
| |
| Affiliation: | 1. Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, 19104, USA;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 18 Tianshui Road, Lanzhou, 730000, PR China;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Department of Materials Science and Engineering, Shandong University, Jing Shi Road 17923, Ji’nan 250061, Shandong, PR China;2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering, Shandong University, Jing Shi Road 17923, Ji’nan 250061, Shandong, PR China;3. Shandong University Suzhou Institute, Suzhou 215123, PR China;4. School of Mechanical and Electronic Engineering, Qingdao Binhai University, West Jialingjiang Road 425, Qingdao 266555, Shandong, PR China;1. Applied Physics Dept., University of Vigo, E.E.I., Lagoas-Marcosende, Vigo 36310, Spain;2. Materials Engineering, Applied Mechanics and Construction Dept., University of Vigo, E.E.I., Lagoas-Marcosende, Vigo 36310, Spain;3. Mechanical Engineering Dept., Columbia University, New York, NY 10027, USA |
| |
| Abstract: | A new laser-texturing method, laser coating texturing, combining surface-laser alloying and texturing was proposed. A thin film of alloy powder was sprayed on the surface before it was textured and alloy elements were introduced into the coating with this method. Experiments of laser texturing and micro-alloying of composite Co-based WC–TiC sintered-carbide coating were performed by pulse laser. Microstructures, roughness and phase compositions of the processed coating were analyzed while its hardness distribution and wear resisting property were also investigated. The results show that the processed coating is metallurgical bonded with the substrate without crack and porosity and mainly composed of Ti, Co, TiC, WC, W2C, Co2C, CoCx. New phases α-W2C, Co3W3C, Co6W6C, CCo2W4 are formed with W decomposed from WC. Structure in the laser-melted zone is mainly cellular and dendritic. The coating is of high micro-hardness, 1000 HV0.2, and has excellent wear resistance, about 1/4 of the wear rate of the substrate. Fatigue wear and grain abrasion of hard particle are the main abrasion mechanisms of the coating through the friction and wear tests. The depth and height of textured craters can be increased and the wear resisting property of textured surface can be improved with the proposed method. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
