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首页> 外文期刊>Journal of Materials Engineering and Performance >Formation of Diffusion Layers by Anode Plasma Electrolytic Nitrocarburizing of Low-Carbon Steel
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Formation of Diffusion Layers by Anode Plasma Electrolytic Nitrocarburizing of Low-Carbon Steel

机译：低碳钢的阳极等离子体电解氮碳共渗形成扩散层

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摘要

The structure of the low-carbon steel after plasma electrolytic nitrocarburizing in the electrolyte containing acetonitrile was investigated. The cross-sectional microstructure, composition, and phase constituents of a modified layer under different processing conditions were characterized. It is shown that the electrolyte that contained ammonium chloride and acetonitrile provides the saturation of steel with nitrogen and carbon and the formation of the Fe4N and FeN0.05 nitrides, Fe4C carbide and other phases. The nitrogen diffusion decreases the austenitization temperature and results in the formation of martensite after the sample cooling in the electrolyte. The formation of a carbon and nitrogen source in a vapor-gas envelope (VGE) is investigated. The proposed mechanism includes evaporation of acetonitrile in the VGE, its adsorption on an anode with the following thermal decomposition, and also the acetonitrile reduction to amine with subsequent hydrolysis to ethanol that is determined with the use of chromatographic method. The aqueous solution that contained 10 wt.% NH4Cl and 10 wt.% CH3CN allows one to obtain the nitrocarburized layer with the thickness of 0.22 mm and microhardness up to 740 HV during 10 min at 850 A degrees C. This treatment regime leads to the decrease in the surface roughness of steel R (a) from 1.01 mu m to 0.17 mu m.
机译：研究了在含乙腈的电解液中进行等离子电解氮碳共渗后的低碳钢的组织。表征了在不同加工条件下改性层的横截面微观结构，组成和相组成。结果表明，含有氯化铵和乙腈的电解质使钢中充满了氮和碳，并形成了Fe4N和FeN0.05氮化物，Fe4C碳化物和其他相。氮扩散降低了奥氏体化温度，并导致在电解液中冷却样品后形成马氏体。研究了在蒸气-气体包壳（VGE）中碳和氮源的形成。所提出的机理包括乙腈在VGE中的蒸发，其在阳极上的吸附以及随后的热分解，以及乙腈还原成胺并随后水解成乙醇的能力，这是通过色谱法测定的。含有10 wt。％NH4Cl和10 wt。％CH3CN的水溶液可以在850 A的温度下在10分钟内获得厚度为0.22 mm，显微硬度高达740 HV的碳氮共渗层。 R（a）的表面粗糙度从1.01微米降低到0.17微米。

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