申井义,林晨,姚永强,刘佳,徐欢欢.高频微振对激光熔覆镍基WC增强涂层的影响[J].表面技术,2020,49(4):230-237.
SHEN Jing-yi,LIN Chen,YAO Yong-qiang,LIU Jia,XU Huan-huan.Effect of High Frequency Microvibration on Laser Cladding Nickel-based WC Reinforced Coatings[J].Surface Technology,2020,49(4):230-237 |
| 高频微振对激光熔覆镍基WC增强涂层的影响 |
| Effect of High Frequency Microvibration on Laser Cladding Nickel-based WC Reinforced Coatings |
| 投稿时间：2019-07-13 修订日期：2020-04-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.04.026 |
| 中文关键词: 高频微振 激光熔覆 镍基碳化钨涂层 显微组织 物相组成 细晶强化 耐磨性 |
| 英文关键词:high frequency microvibration laser cladding nickel-based WC coating microstructure phase composition fine-grain strengthening wear resistance |
| 基金项目: |
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| Author | Institution |
| SHEN Jing-yi | Qingdao University of Technology, Qingdao 266520, China |
| LIN Chen | Qingdao University of Technology, Qingdao 266520, China |
| YAO Yong-qiang | Qingdao University of Technology, Qingdao 266520, China |
| LIU Jia | Qingdao University of Technology, Qingdao 266520, China |
| XU Huan-huan | Qingdao University of Technology, Qingdao 266520, China |
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| 中文摘要: |
| 目的 改善传统激光熔覆工艺制备的涂层组织粗大，物相分布不均匀，易出现气孔裂纹等缺陷。 方法 采用松香酒精溶液作为粘接剂，将涂层材料（镍包碳化钨粉末）预置于Q235钢基体表面，选用最优激光参数（功率P=1600 W、光斑直径d=5 mm、扫描速度ν=4 mm/s），并在高频微振辅助工艺下进行熔覆试验，最终制备出镍基碳化钨增强涂层。分别使用扫描电子显微镜（SEM）、能谱仪（EDS）、X射线衍射仪（XRD）、显微硬度仪及万能摩擦磨损试验机（UMT）对涂层的显微组织、元素成分及物相、显微硬度和耐磨性能进行测量分析。结果 在高频微振产生的激振力作用下，涂层组织由粗大的树枝晶向等轴晶及细小枝晶转变，物相成分主要为γ-Ni(Fe)、Ni3Fe、WC、M23C6型化合物等，深色硬质相分布均匀，气孔裂纹等缺陷基本消失，涂层磨损机制主要为轻微磨粒磨损。与无高频微振辅助的涂层相比，显微硬度提高了17%，摩擦系数减小了29%，耐磨性提高了49%。结论 利用高频微振辅助激光熔覆工艺，可使制备出的涂层质量显著改善，微观组织更加致密，成分分布更加均匀，细晶强化和弥散强化效果增强，硬度、耐磨性等力学性能得到明显提升。 |
| 英文摘要: |
| The work aims to improve the coarseness of the coating structure, the uneven distribution of the phase, and the defects such as pores and cracks in the conventional laser cladding process. The coating material (nickel-coated WC powder) was preliminarily placed on the surface of the Q235 steel substrate with the rosin alcohol solution as a binder. The optimum laser parameters (power P=1600 W, spot diameter d=5 mm, scanning speed ν=4 mm/s) were used and the cladding test was carried out under the high frequency microvibration. Finally, the nickel-based WC reinforced coating was prepared. The microstructure, element composition, phase, microhardness and wear resistance of the coatings were measured and analyzed by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), microhardness tester and universal friction and wear tester (UMT). Under the excitation force generated by high-frequency microvibration, the coating structure was transformed from coarse dendrites to equiaxed crystals and fine dendrites, the phase components were mainly γ-Ni(Fe), Ni3Fe, WC, M23C6 type compounds and the like. The dark hard phase was evenly distributed, and the defects such as pores and cracks almost disappeared. The coating wear mechanism was mainly slight abrasive wear. Compared to the coating without high frequency microvibration, the microhardness was increased by 17%, the friction coefficient was reduced by 29%, and the wear resistance was increased by 49%. High-frequency microvibration-assisted laser cladding can significantly improve the quality of the coating prepared, make the microstructure more dense and the component distribution more uniform, enhance the effect of fine-grain strengthening and dispersion strengthening, and significantly improve the mechanical properties such as hardness and wear resistance. |
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