| 摘要: |
| 为探究激光重熔轨迹对喷涂Fe基Ni/WC金属陶瓷涂层摩擦学性能的影响，利用火焰喷涂设备在45钢基体表面制备Fe基Ni/WC金属陶瓷涂层，分别采用矩形、平行、圆形3种扫描轨迹对涂层表面进行激光重熔。利用SEM、EDS、XRD等分别测定涂层显微组织、微区组织成分、物相结构和残余应力。利用MMG-10型摩擦磨损试验机进行常温干摩擦磨损实验。结果表明：圆形扫描轨迹下的重熔层组织结构为晶粒更为细小的等轴晶，增大了裂纹源形成和扩展的阻力。重熔层主要为α（Fe， Ni）、M23C6和WC、W2C等硬质相颗粒，起到弥散强化和固溶强化的作用，进而提高重熔层硬度。圆形轨迹重熔层较其他两种轨迹表现出更好的摩擦性能，硬质相颗粒镶嵌在软质基体中，起到强韧结合的作用。圆形轨迹下的磨损量较矩形轨迹降低了58.3%，残余应力降低了14.5%；硬质相和氧化膜的协同作用使得重熔表面变得光滑，从而降低摩擦因数。 |
| 关键词: 激光重熔 扫描轨迹 火焰喷涂 耐磨 残余应力 |
| DOI：10.11933/j.issn.1007-9289.20171009001 |
| 分类号:TG174.442 |
| 基金项目:国家自然科学基金（51565017）；江西省自然科学基金（2012BAB206026，20171BAB206030） |
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| Influences of Laser Remelting Paths on Tribological Property of Fe-based Ni/WC Spraying Coatings |
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DU Hui-hui, ZHAO Yun-cai, HUANG Li-rong, SHANGGUAN Xu-chao
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School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi
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| Abstract: |
| In order to investigate the influence of different laser remelting paths on the tribological properties of Fe based Ni/WC cermet coatings, Fe-based Ni/WC cermet coatings were prepared on the surface of 45 steel by flame spraying equipment followed three laser remelting treatment with paths including rectangular, parallel and circular. The microstructure, micro-tissue components, phase structure and residual stress were studied by SEM, EDS and XRD, respectively. The normal temperature dry wear test was conducted by MMG-10 friction wear test machine. Results show that the structure of the remelting layer under the circular scanning trajectory is small equiaxial crystal, which increases the resistance of the crack source formation and expansion. The particles of α(Fe, Ni), M23C6 and WC, W2C and other ceramic particles are distributed among the remelting layer, which plays the roles of dispersion and solid solution strengthening to improve the hardness of the remelting layer. The circular path shows better tribological property than the other two kinds of paths and the hard phase particles embed in the soft substrate, which can effectively improve combination; The wear rate and residual stress the coating treated with circular path is 58.3% and 14.5%, respectively, lower than that of the rectangular. The combination of hard phase and oxide film makes the surface of the remelted coating smooth and remarkably reduces the friction coefficient. |
| Key words: laser remelting scanning trajectory flame spraying wear resistance residual stress |
