激光熔覆FeAlCrNiSiC高熵合金涂层研究

发布时间：2019-06-14 12:44

【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5mm/s,能量密度47J/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800HV,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]:FeAlCrNiSiC six-element high entropy alloy coating was prepared on the surface of 45 # steel by using YAG pulse solid-state laser under the protection of high purity argon. The morphology, microstructure, composition, phase structure, hardness and related mechanism of the alloy coating prepared by OM,SEM,EDS,XRD and microhardness were studied. The experimental results show that the optimized laser coating process parameters are as follows: power 85 W, laser scanning speed 5 mm 鈮，

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