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采用液相等离子电解渗氮技术,研究了不同甲酰胺浓度对38CrMoAl钢渗氮层组织及性能的影响。利用OM、SEM、XRD观察分析渗氮层的微观组织结构和物相构成,RF-GDOES和Parstat2273电化学工作站分别表征渗氮层的元素分布和耐蚀性,并测试分析了渗层截面的显微硬度。结果表明,随着电解液中甲酰胺浓度的升高,渗氮致密层、白亮层、扩散层厚度呈先增加后降低的趋势,渗氮层最大显微硬度值呈增加的趋势;当甲酰胺浓度升高至70%时渗氮层达到最大,为125μm,白亮层为51μm;渗氮后扩散层硬度值较高,而心部组织硬度较未处理试样提升约2倍;渗氮层表层主要含Fe2N和Fe3N相,扩散层以Fe16N2、FeN相为主,过渡层主要为α-Fe、FeN0.097相;渗氮层的耐蚀性优于未经处理试样。
The effects of different formamide concentrations on the microstructure and properties of nitrided layer of 38CrMoAl steel were studied by liquid plasma ion nitriding. The microstructure and phase composition of the nitrided layer were observed and analyzed by OM, SEM and XRD. The elemental distribution and corrosion resistance of the nitrided layer were characterized by RF-GDOES and Parstat2273 electrochemical workstation, respectively. Microhardness. The results show that the thickness of nitrided dense layer, white bright layer and diffusion layer first increase and then decrease with the increase of the concentration of formamide in the electrolyte, and the maximum microhardness value of nitrided layer tends to increase. When formamide The nitrided layer reaches its maximum at 125μm and white bright layer is 51μm when the concentration is increased to 70%. The hardness of the diffusion layer is higher after nitriding, while the hardness of the heart tissue is about twice as that of the untreated sample. The main Fe2N and Fe3N phase, the diffusion layer to Fe16N2, FeN phase-based, the transition layer is mainly α-Fe, FeN0.097 phase; nitriding layer corrosion resistance is better than the untreated sample.