激光熔覆FeAlCrNiSiC高熵合金涂层研究

陈岁元; 徐世海; 王力; 尹桂莉; 梁京; 刘常升

doi:doi:10.14128/j.cnki.al.20153501.007

应用激光, 2015, 35 (1): 7, 网络出版: 2015-03-23

激光熔覆FeAlCrNiSiC高熵合金涂层研究

Study on Laser Cladding FeAlCrNiSiC High Entropy Alloy Coating

论文大纲

陈岁元 ^*徐世海王力尹桂莉梁京刘常升

作者单位

东北大学材料各向异性与织构教育部重点实验室, 辽宁沈阳 110819

高熵合金激光熔覆耐磨涂层冶金结合硬度 high-entropy alloy(HEA) laser cladding wear-resistant coating metallurgical bonding hardness

摘要

利用YAG脉冲固体激光器, 在高纯氩气的保护下, 选取优化了的激光工艺参数在45#钢表面制备FeAlCrNiSiC六元高熵合金涂层。主要采用OM、SEM、EDS、XRD和显微硬度等分析手段, 对实验制备的合金涂层的形貌、组织结构、成分、相结构、硬度及相关机理进行了研究。实验结果表明: 优化的激光熔覆工艺参数为功率85 W, 激光扫描速度为5 mm/s, 能量密度47 J/mm2, 搭接率50%。采用此优化工艺参数成功制备了与基体形成良好冶金结合的FeAlCrNiSiC高熵合金涂层。制备涂层的硬度达到了800 HV, 涂层的内部结构由条状等轴晶及网状枝晶组成, 组分偏析得到了有效缓解。合金涂层具有FCC结构的γ-Fe和BCC结构的FeAlCrNiSiC固溶体的简单物相, 合金元素Al、Cr、Si、Ni、C固溶在两种多组元固溶体中, 增加了晶格畸变, 使涂层具有高的硬度。

Abstract

A FeAlCrNiSiC hexabasic alloy coating was prepared on the surface of 45 steel by using YAG pulsed laser under the protection of high purity argon. The overlap cladding coating prepared based on optimized laser process parameters of single coating. The morphology, structure, composition, phase structure analysis, hardness and related mechanism of the cladding coating were analyzed using OM, SEM, EDS, XRD and the hardness tester. The experiments show that the optimized process parameters of laser cladding are power of 85 W, laser scanning speed of 3.0mm/s, power density of 58 J/mm2, and overlap of 50%. A FeAlCrNiSiC HEA alloy coating with good metallurgical bonding on the 45 steel substrate surface was successfully prepared by using the optimized laser processing parameters. The microhardness of the coating reaches 800HV. The microstructure of the coating is mainly composed of strip equiaxed polygonal grains and dendritic crystal, component segregations have been successfully relieved. The coating have the simple phases of γ-Fe(FCC)and FeAlCrNiSiC(BCC)solid solution. Thus Al, Cr, Si, Ni, C are expected to distribute in the multi-element supersaturated solid solution and increase the distortion of lattice so that the coating has high hardness.

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陈岁元, 徐世海, 王力, 尹桂莉, 梁京, 刘常升. 激光熔覆FeAlCrNiSiC高熵合金涂层研究[J]. 应用激光, 2015, 35(1): 7. Chen Suiyuan, Xu Shihai, Wang Li, Yin Guili, Liang Jing, Liu Changsheng. Study on Laser Cladding FeAlCrNiSiC High Entropy Alloy Coating[J]. APPLIED LASER, 2015, 35(1): 7.

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