引用本文:王一澎,陈志国,汪力,魏祥,舒忠良,沈聪.激光比能对Fe2B激光熔覆涂层微观组织与性能的影响[J].中国表面工程,2020,33(1):117~124
Wang Yipeng,Chen Zhiguo,Wang Li,Wei Xiang,Shu Zhongliang,Shen Cong.Effects of Laser Specific Energy on Microstructure and Properties of Fe2B Laser Cladding Coating[J].China Surface Engineering,2020,33(1):117~124
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激光比能对Fe2B激光熔覆涂层微观组织与性能的影响
王一澎1, 陈志国1,2, 汪力2, 魏祥1,2, 舒忠良1, 沈聪1
1.中南大学 材料科学与工程学院, 长沙 410083;2.湖南人文科技学院 材料工程系, 娄底 417000
摘要:
利用粉末喷射激光熔覆以球形硼铁粉末为原材料成功制备了 Fe2B 金属间化合物涂层。 采用金相显微镜 (OM)、 X 射线衍射仪 (XRD)、 扫描电镜 ( SEM)、 电子探针 (EPMA)、 显微维氏硬度计及摩擦磨损试验机对涂层的组织与性能进行了表征。 结果表明: 当激光比能控制在 3. 00×10 8 kJ/ m 2 左右时, 采用粉末喷射激光熔覆能制备较为理想的 Fe2B 金属间化合物涂层。 制备的单层涂层的物相为 Fe2B 与 Fe, 显微硬度峰值达 1360 HV0. 05 , 涂层组织中大量弥散分布的 Fe2B 相的生成是涂层具有高硬度的原因。 制备的多层涂层与基体具有良好的冶金结合, 从基体到涂层, 组织经历了一个由平面外延生长组织到胞状晶再到等轴晶的演变过程, 涂层稳定摩擦因数为 0. 385, 磨损率为 5. 67×10 -15 m 3 / N·m,表现出良好的耐磨性能, 磨损机制为磨粒磨损与疲劳磨损。
关键词:  激光熔覆  激光比能  Fe2B 金属间化合物  微观组织
DOI：10.11933/j.issn.1007-9289.20190128001
分类号:TG174.44
文章编号:1007-9289(2020)01-0117-08
文献标识码:A
基金项目:湖南省双一流学科建设及应用基础研究(2016JC2007)； 湖南省自然科学基金 (2017JJ3122)
Effects of Laser Specific Energy on Microstructure and Properties of Fe2B Laser Cladding Coating
Wang Yipeng1, Chen Zhiguo1,2, Wang Li2, Wei Xiang1,2, Shu Zhongliang1, Shen Cong1
1.School of Materials Science and Engineering, Central South University, Changsha 410083 , China;2.Department of Materials Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000 , China
Abstract:
With spherical ferroboron alloy powder as raw material, the Fe2B intermetallic coatings were successfully prepared by powder injection laser cladding. Microstructure and properties of the coatings were analyzed by employing metallographic microscope (OM), X-ray diffracton (XRD), scanning electron microscopy (SEM), electron probe microanalysis (EPMA), micro Vickers hardness tester and friction wear tester. Results show that when the laser specific energy was controlled at about 3. 00×10 8 kJ/ m 2 , a more desirable Fe2B intermetallic compound coating could be prepared. The phases of the prepared monolayer coating were Fe2B and Fe, and the peak microhardness reached 1360 HV0. 05 . The formation of a large number of dispersed Fe2B phases in the coating microstructure contributed to the high hardness of the coating. The metallurgical bond between the prepared multilayer coating and substrate was well realized. From substrate to coating, the microstructure had experienced an evolution process from planar epitaxial growth microstructure to cellular-like crystal and then to equiaxed crystal. The coating had good wear-resisting property, with stable friction coefficient of 0. 385 and wear rate of 5. 67×10 -15 m 3 / Nm. And its wear mechanism was abrasive wear and fatigue wear.
Key words:  laser cladding  laser specific energy  Fe2B intermetallic  microstructure
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