光学学报, 2015, 35 (s2): s214007, 网络出版: 2015-10-08  

机械振动辅助激光熔覆铁基涂层的微结构特征及结合界面处的元素扩散行为

Microstructure and Element Diffusion Behavior at Interface of Fe-Based Coatings by Mechanical Vibration Assisted Laser Cladding
作者单位
昆明理工大学材料科学与工程学院,云南 昆明 650093
摘要
采用机械振动辅助同步送粉,通过激光熔覆技术在45钢表面制备了Fe60合金涂层。利用光学显微镜(OM)、X射线扫描仪(XRD)、扫描电镜(SEM)和能谱分析(EDS)仪研究了了铁基涂层与基体结合界面处的显微形貌、物相组成,元素分布及其扩散行为。结果表明,熔覆层结合界面处均是完整向上生长的胞状树枝晶,主要物相为 (Fe,Cr) 固溶体和少量化合物(Fe,Cr)7C3,Fe2B和Fe0.9Si0.1。机械振动的能量致使树枝晶中Fe0.9Si0.1由枝晶内离散至枝晶间,大量(Fe,Cr) 固溶体未能在凝固前端排出而残留在枝晶内。机械振动的能量越高,越有利于激光熔池中元素的扩散。同时,振动的振幅和频率对结合界面前沿晶粒细化及元素分布的影响也存在差异,频率的增加有利于枝晶定向生长,振幅增加则有利于在结合界面前沿40 μm左右范围内的枝晶弥散分布。振幅增加对结合界面间的Si和Cr元素扩散影响更大。
Abstract
Fe60 alloy coating is fabricated on 45 steel surfaces using mechanical vibration assisted synchronous powder feeding laser cladding process. The microstructure of Fe-based cladding coating and bonding interface, phase composition, element distribution characteristic and diffusion behavior at the interface are investigated by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), respectively. The results show that the bonding interface are complete to cellular dendritic crystal growth, the main phases are composed of (Fe,Cr) solid solution and a small amount of (Fe, Cr) 7C3, Fe2B and Fe0.9Si0.1 compound. Mechanical vibration energy causes dendrite Fe0.9Si0.1 discrete from dendrite internal to interdendrite, and a large amount of (Fe,Cr) solid solution remains in the dendrite internal. Higher mechanical vibration energy leads to better element diffusion in laser molten pool. Meanwhile, the effect of vibration amplitude and frequency on the elements distribution and grain refining at the bonding interface front are also different. Increase the frequency is beneficial to the directional dendrite growth and increase the amplitude is beneficial to the dendritic dispersed distribution at the bonding interface front 40 μm scope. Increase amplitude is more advantageous to the Si and Cr element diffusion at the bonding interface.

杨昕恬, 刘洪喜, 张晓伟, 陶喜德, 蒋业华. 机械振动辅助激光熔覆铁基涂层的微结构特征及结合界面处的元素扩散行为[J]. 光学学报, 2015, 35(s2): s214007. Yang Xintian, Liu Hongxi, Zhang Xiaowei, Tao Xide, Jiang Yehua. Microstructure and Element Diffusion Behavior at Interface of Fe-Based Coatings by Mechanical Vibration Assisted Laser Cladding[J]. Acta Optica Sinica, 2015, 35(s2): s214007.

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