张晓东,揭晓华,罗松,郑琼彬.WC / Co-Cr 复合涂层激光熔覆工艺优化与表征[J].表面技术,2015,44(6):11-16.
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].Surface Technology,2015,44(6):11-16 |
| WC / Co-Cr 复合涂层激光熔覆工艺优化与表征 |
| Process Optimization for Laser Cladding Operation of WC/ Co-Cr and Its Characterization |
| 投稿时间：2014-12-25 修订日期：2015-06-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.06.003 |
| 中文关键词: 激光熔覆 WC/ Co-Cr 复合涂层 显微组织 元素分布 |
| 英文关键词:laser cladding WC / Co-Cr composite coating microstructure distribution of chemical element |
| 基金项目:广东省教育部产学研重大项目(2010A09020047) |
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| Author | Institution |
| ZHANG Xiao-dong | Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China |
| JIE Xiao-hua | Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China |
| LUO Song | Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China |
| ZHENG Qiong-bin | Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China |
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| 中文摘要: |
| 目的 优化复合涂层的熔覆工艺参数,获得综合性能优异的 WC/ Co-Cr 复合涂层。 揭示复合涂层的相结构、组织构成及界面特性。 方法 采用 YAG 固体激光器在45 钢上熔覆 WC/ Co-Cr 复合涂层,以电流、频率、脉宽、扫描速度作为变量,设计四因素三水平正交试验,对熔覆效果进行评分,获得最佳参数组合。 通过 XRD,XRF,OM,EMPA 等分析手段对复合涂层进行表征。 结果 电流对熔覆效果的影响最显著,其次为频率,再次之为激光扫描速度,脉宽的影响显著性最小。 随 WC 含量增加,激光脉宽应增加,而激光扫描速度应该适当减小。 复合涂层的显微组织形貌主要为固溶体上分布着共晶组织以及金属间化合物、碳化物,还有由成分过冷导致的胞状组织。 复合涂层的物相组成包括 CrCo,WC,Cr7C3,Cr3C2 等。结论 采用 WC 质量分数 10% 的熔覆粉末,最佳熔覆工艺组合为:电流 380 A,频率 40 Hz,脉宽 1 ms,扫描速度8 mm/ s。 采用 WC 质量分数20% 的熔覆粉末,最佳熔覆工艺组合为:电流380 A,频率40 Hz,脉宽1. 5 ms,扫描速度 6 mm/ s。 复合涂层与混合粉末相比,相组成发生了变化,有金属间化合物、碳化物等强化相产生,且元素在界面的分布呈现过渡式变化,这对涂层的综合性能有利。 |
| 英文摘要: |
| 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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