胡晓冬,朱秀晖,胡勇,王梁,陈智君,姚建华.稳态磁场对激光熔注尖角WC涂层颗粒分布及显微组织的影响[J].表面技术,2019,48(2):54-61.
HU Xiao-dong,ZHU Xiu-hui,HU Yong,WANG Liang,CHEN Zhi-jun,YAO Jian-hua.Effect of Steady Magnetic Field on Distribution and Microstructure of Sharp WC Particle by Laser Melt Injection[J].Surface Technology,2019,48(2):54-61 |
| 稳态磁场对激光熔注尖角WC涂层颗粒分布及显微组织的影响 |
| Effect of Steady Magnetic Field on Distribution and Microstructure of Sharp WC Particle by Laser Melt Injection |
| 投稿时间：2018-10-23 修订日期：2019-02-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.02.008 |
| 中文关键词: 激光熔注 稳态磁场 横截面形貌 尖角WC颗粒 显微组织 显微硬度 |
| 英文关键词:laser melt injection steady magnetic field profile of cross section sharp corner WC particle microstructure micro-hardness |
| 基金项目:国家重点研发计划项目（2017YFB1103601）；国家自然科学基金资助项目（51705464） |
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| Author | Institution |
| HU Xiao-dong | 1.Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China; 2.Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310014, China |
| ZHU Xiu-hui | 1.Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China; 2.Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310014, China |
| HU Yong | 1.Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China; 2.Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310014, China |
| WANG Liang | 1.Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China; 2.Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310014, China |
| CHEN Zhi-jun | 1.Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China; 2.Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310014, China |
| YAO Jian-hua | 1.Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China; 2.Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310014, China |
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| 中文摘要: |
| 目的 研究稳态磁场对激光熔注尖角WC涂层中WC颗粒分布及涂层显微组织的影响。方法 利用稳态磁场辅助激光熔注技术，在316L不锈钢基板上制备了WC/316L复合涂层。采用光学显微镜（OM）对涂层横截面形貌进行分析，采用扫描电镜（SEM）观察涂层显微组织结构和特征，采用能谱仪（EDS）对涂层元素分布进行分析，采用维氏硬度计对涂层的显微硬度进行测定。结果 未施加稳态磁场的涂层中WC颗粒均匀分布，涂层主要由鱼骨状的共晶组织组成，在涂层的顶部出现了十字花状的过共晶组织。施加稳态磁场后，涂层横截面形貌发生明显改变，涂层深度减小，宽度增大，WC颗粒主要分布在涂层底部。涂层顶部由细长的树枝状组织组成；在涂层中部，树枝状组织变短变粗；在涂层底部，转变为大量的十字花状组织。施加稳态磁场后，涂层的平均显微硬度由未加磁场时的394 HV0.3提高到478 HV0.3。结论 稳态磁场能有效作用于熔池，通过抑制熔池的流动来改变WC颗粒的受力状况以及熔池的传热、传质情况，最终改变熔池中WC颗粒的分布状态和涂层的显微组织。 |
| 英文摘要: |
| The work aims to study the effect of steady magnetic on the distribution and microstructure of sharp WC particle by the laser melt injection coating. The WC/316L composite coating was prepared on 316L stainless steel by laser melt injection under the steady magnetic field. The profile of coating cross section was analyzed by microscope (OM), the microstructure and characteristics of the coating were analyzed by scanning electron microscope (SEM), the element distribution of the coating was analyzed by energy disperse spectrometer (EDS), and the hardness of the coating was determined by Vicker shardness tester. In the coating not under steady magnetic field, WC particles were evenly distributed. The coating was mainly composed of herring bone microstructure, but there were some cross-shaped hypereutectic structureson the top of the coating. In the coating under steady magnetic field, the profile of the cross section changed significantly. The depth of profile decreased, the width of profile increased, and the WC particles were mainly distributed at the bottom of the coating. On the top of the coating, slender dendritic structures were formed. In the middle of the coating, the shorter and thicker dendritic structure appeared. At the bottom of the coating, lots of cross-shaped hypereutectic structures occurred. After the steady magnetic field was applied, the average micro-hardness of the coating increased from 394HV0.3 to 478HV0.3. The steady magnetic field can affect the molten pool effectively, and change the stress conditions of WC particles and the heat transfer and mass transfer by inhibiting the flow of molten pool, so as to change the distribution of WC particles in the molten poll and the microstructure of the coating. |
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