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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of chromium addition on microstructure and properties of TiC-VC reinforced Fe-based laser cladding coatings
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Effects of chromium addition on microstructure and properties of TiC-VC reinforced Fe-based laser cladding coatings

机译：铬添加对TIC-VC增强Fe基激光覆层涂层微观结构和性能的影响

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摘要

Effects of different addition of Cr on microstructure and properties (especially the corrosion resistance) of cladding layers were investigated by means of X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), potentio-dynamic polarization and electrochemical impedance spectroscopy (EIS). Results showed that Fe-Ti-V-C alloy powders with different addition of Cr formed good cladding layers without defects such as cracking and porosity. Phases of the cladding layers were α-Fe, γ-Fe, TiC, VC and TiVC_2. A certain amount of long strip Cr_3C_2 synthesized while the addition of Cr was 12.0% or more. Microhardness and corrosion resistance of cladding layer both improved greatly with a moderate amount of Cr. The cladding layer with 3.0% Cr showed a highest microhardness 1090HV_(0.2), and the variation tendency of the hardness is not a linearly relationship with increasing the chromium addition. The cladding layer with 12.0% Cr addition showed the best corrosion resistance, which was about 4.5 times than that of the cladding layer without Cr. EIS spectrum of the cladding layer without Cr was composed of an inductive arc at low frequency and a capacitive arc at high frequency. However, the inductive arc at low frequency transformed into a capacitive arc gradually with the addition of Cr increasing.
机译：通过X射线衍射法（XRD），扫描电子显微镜（SEM），能量分散光谱仪，能量分散光谱分析，研究了不同添加CR对微结构和性质（特别是耐腐蚀性）的效果​​（特别是耐腐蚀性），能量分散光谱仪（EDS），能量分散光谱仪和电化学阻抗光谱（EIS）。结果表明，Fe-Ti-V-C合金粉末不同添加Cr的薄片形成良好的包层，没有缺陷如裂缝和孔隙率。包层层的阶段是α-Fe，γ-Fe，Tic，Vc和TiVc_2。合成的一定量的长条形CR_3C_2，同时加入Cr为12.0％以上。包层层的微硬度和耐腐蚀性均用中等量的Cr改善。具有3.0％Cr的包层层显示出最高的微硬度1090hv_（0.2），并且硬度的变化趋势与增加铬添加不具有线性关系。具有12.0％Cr添加的包层层显示出最佳的耐腐蚀性，而没有Cr的包层层的耐腐蚀性约为4.5倍。没有Cr的包层层的EIS光谱由低频的电感弧和高频电容电弧组成。然而，通过增加CR增加，逐渐地将低频变换成电容弧。

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