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首页> 外文期刊>Journal of Materials Engineering and Performance >Modification of Low-Alloy Steel Surface by Plasma Electrolytic Nitriding
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Modification of Low-Alloy Steel Surface by Plasma Electrolytic Nitriding

机译：等离子体电解渗氮改性低合金钢表面

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摘要

The structure of the low-alloy steel after plasma electrolytic nitriding (PEN) in electrolyte containing ammonium nitrate was investigated. The cross-sectional microstructure, composition, and phase constituents of modified layer under different processing conditions were characterized. It is shown that anode PEN provides the saturation of steel with nitrogen and formation of alpha-Fe2O3, FeO, and Fe3O4 oxides, Fe2-3N nitride, and martensite. The aqueous solution that contained 15 wt.% NH4Cl and 5 wt.% NH4NO3 allows one to obtain the hardened layer with a thickness of 80 mu m and a microhardness up to 740 HV during 5 min at 850 A degrees C. Surface roughness decreases from 1.5 to 0.8 mu m after 5-min PEN at 650 A degrees C. The proposed electrolyte and processing mode (750 A degrees C, 10 min) enable to obtain the decrease in the weight loss after lubricate wear testing by a factor of 2.7. The base-nitrate electrolyte conditioned a decrease in the corrosion current density by a factor of 9 due to passivating effect of the oxide and nitride of iron.
机译：研究了含硝酸铵的电解质中等离子电解渗氮（PEN）后低合金钢的组织。表征了在不同加工条件下改性层的截面微观结构，组成和相组成。结果表明，阳极PEN使钢充满氮并形成α-Fe2O3，FeO和Fe3O4氧化物，Fe2-3N氮化物和马氏体。含有15 wt。％NH4Cl和5 wt。％NH4NO3的水溶液可在850 A的温度下在5分钟内获得厚度为80μm且显微硬度高达740 HV的硬化层。表面粗糙度从在650 A的温度下经过5分钟的PEN后1.5到0.8μm。建议的电解质和处理模式（750 A的温度，10分钟）能够使润滑磨损测试后的重量损失减少2.7倍。由于铁的氧化物和氮化物的钝化作用，碱式硝酸盐电解质使腐蚀电流密度降低了9倍。

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