| 稳恒磁场设计及电流强度对激光熔覆Fe55涂层微结构的影响 |
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| 引用本文： | 刘洪喜,刘子峰,张晓伟,石海,蒋业华.稳恒磁场设计及电流强度对激光熔覆Fe55涂层微结构的影响[J].红外与激光工程,2017,46(4):406001-0406001(7). |
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| 作者姓名： | 刘洪喜 刘子峰 张晓伟 石海 蒋业华 |
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| 作者单位： | 1.昆明理工大学 材料科学与工程学院,云南 昆明 650093 |
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| 基金项目： | 国家自然科学基金（11674134，61368003）;云南省应用基础研究计划重点项目（（P0120150044）;云南省中青年学术和技术带头人后备人才资助项目（2014HB007） |
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| 摘 要： | 利用自行设计的稳恒磁场装置以辅助激光熔覆工艺，通过调节电流强度获得相应的稳恒磁场作用于激光熔池，在45钢基材表面制备了Fe55合金涂层。借助扫描电子显微镜（SEM）、能谱仪（EDS）和X射线衍射（XRD）等表征手段分析了稳恒磁场作用下Fe55合金涂层的微观形貌、化学组成和物相结构。结果表明，Fe55合金涂层主要由-（Fe，Cr）和（Fe，Ni）固溶体、（Cr，Fe）23C6碳化物及少量Cr9.1Si0.9组成。与未施加磁场相比，稳恒磁场作用下的激光熔覆Fe55涂层，枝晶间Cr元素含量更高，枝晶内Fe元素含量也有所增加。稳恒磁场在一定程度上促进了激光熔池中的传质过程，有助于Fe，Cr元素扩散和（Fe，Cr）固溶体的形成。当电流强度为4.0 A时，外加磁场大大降低了熔池内固-液界面前沿的温度梯度，增加了液态金属熔池的形核率，涂层中大量柱状枝晶和树枝晶转变为方向各异的等轴晶，涂层组织得到了明显优化。
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| 关 键 词： | 激光熔覆 稳恒磁场 合金涂层 微观组织 |
| 收稿时间： | 2016-08-06 |
Design of steady-state magnetic field and effect of current intensity on microstructure of Fe55 alloy coating by laser cladding |
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| Affiliation: | 1.School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China |
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| Abstract: | Using self-designed steady-state magnetic field device, combined with laser cladding process, by adjusting current intensity to obtain corresponding steady-state magnetic field and put the magnetic field on laser molten pool, Fe55 alloy coatings was fabricated on 45 substrate steel surface. The microstructure, chemical composition and phase characteristics of the cladding coatings were characterized by scanning electron microscope(SEM), energy disperse spectroscopy(EDS) and X-ray diffraction (XRD). The results show that Fe55 alloy coating is mainly composed of -(Fe, Cr) solid solution, (Fe, Ni) solid solution, (Cr, Fe)23C6 carbide and a small amount of Cr9.1Si0.9. The interdendritic Cr element content in laser cladding Fe55 alloy coating with steady-state magnetic field is higher than that of the laser cladding without magnetic field, and dendrite internal Fe element content also increased. To a certain extent, the steady-state magnetic field can promote the mass transfer process in laser melten pool, which is beneficial to the diffusion of Fe, Cr elements and the formation of (Fe, Cr) solid solution. When the current intensity is 4.0 A, steady-state magnetic field greatly reduces the temperature gradient of solid-liquid interface in laser molten pool, and increases the nucleation rate in liquid metal molten pool. A large number of columnar dendrites and dendritic crystals are changed into directions different equiaxed grains in coating, and the microstructure of Fe55 alloy coating has been significantly optimized. |
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