| ZHANG Xiao-dong,JIE Xiao-hua,LUO Song,ZHENG Qiong-bin.Process Optimization for Laser Cladding Operation of WC/ Co-Cr and Its Characterization[J],44(6):11-16 |
| Process Optimization for Laser Cladding Operation of WC/ Co-Cr and Its Characterization |
| Received:December 25, 2014 Revised:June 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.06.003 |
| KeyWord:laser cladding WC / Co-Cr composite coating microstructure distribution of chemical element |
| Author | Institution |
| ZHANG Xiao-dong |
Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou , China |
| JIE Xiao-hua |
Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou , China |
| LUO Song |
Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou , China |
| ZHENG Qiong-bin |
Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou , China |
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| Abstract: |
| Objective To optimize the laser cladding operation of excellent WC/ Co-Cr composite coating, and to figure out the phase, microstructure and distribution of chemical elements of composite coating. Methods YAG Laser was utilized to carry out WC/ Co-Cr composite coating on 45 carbon steel. Orthogonal experiments were performed which contains four factors at three different levels. Four factors were current, frequency, pulse width and scanning speed. Several characterization techniques, such as XRD, XRF, OM and EMPA, were employed to characterize the phases, structure and interface of WC/ Co-Cr Composite coating. Results The influence of the Electric current to the cladding effect was the most significant, followed with the frequency, the laser scanning speed, and then the Pulse-width. Laser pulse width should be increased, conversely, laser scanning speed should be reduced with the increase of WC content. The microstructure of composite coating are eutectic, carbide and intermetallic distributing on solid solution. In addition, cell structure caused by composition undercooling was observed on the micro-graph. The phases of coating are CrCo, WC, Cr7 C3 and Cr3 C2 . Conclusion Current is the main influence factor for Laser cladding. Two optimum technological parameters combinations are respectively 380 A, 40 Hz, 1 ms, 8 mm / s for coating which contains 10wt% WC, and 380 A, 40 Hz, 1. 5 ms, 6 mm / s for coating which contains 20wt% WC. Several new phases were observed after laser cladding, such as carbide and intermetallic. The distribution of chemical element along with the cross section are transitional. Our results suggest there is a transition region between the coating and substrate. |
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