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首页> 外文期刊>Materials Science >Surface modification of austenitic steel by various glow-discharge nitriding methods
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Surface modification of austenitic steel by various glow-discharge nitriding methods

机译：通过各种辉光放电渗氮方法对奥氏体钢进行表面改性

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Recent years have seen intensive research on modifying glow-discharge nitriding processes. One of the most commonly used glow-discharge methods includes cathodic potential nitriding (conventional method), and active screen plasma nitriding. Each of these methods has a number of advantages. One very important, common feature of these techniques is full control of the microstructure, chemical and phase composition, thickness and the surface topography of the layers formed. Another advantage includes the possibility of nitriding such materials as: austenitic steels or nickel alloys, i.e. metallic materials which do not diffuse nitrogen as effectively as ferritic or martensitic steels. However, these methods have some disadvantages as well. In the case of conventional plasma nitriding, engineers have to deal with the edge effect, which makes it difficult to use this method for complexly shaped components. In turn, in the case of active screen plasma nitriding, the problem disappears. A uniform, smooth layer forms, but is thinner, softer and is not as resistant to friction compared to layers formed using the conventional method. Research is also underway to combine these methods, i.e. use an active screen in conventional plasma nitriding at cathodic potential. However, there is a lack of comprehensive data presenting a comparison between these three nitriding processes and the impact of pulsating current on the formation of the microstructure and functional properties of austenitic steel surfaces. The article presents a characterisation of nitrided layers produced on austenitic X2CrNiMo17-12-2 (AISI?316L) stainless steel in the course of glow-discharge nitriding at cathodic potential, at plasma potential and at cathodic potential incorporating an active screen. All processes were carried out at 440?°C under DC glow-discharge conditions and in 100?kHz frequency pulsating current. The layers were examined in terms of their microstructure, phase and chemical composition, morphology, surface roughness, hardness, wear and corrosion resistance. Studies have shown a strong influence of the type of nitriding method used and of the electrical conditions on the? microstructure and properties of the diffusion layers formed.
机译：近年来，已经进行了有关改进辉光放电渗氮工艺的深入研究。最常用的辉光放电方法之一包括阴极电势氮化（传统方法）和有源屏蔽等离子体氮化。这些方法中的每一个都有许多优点。这些技术的一个非常重要的共同特征是完全控制所形成层的微观结构，化学和相组成，厚度以及表面形貌。另一个优点包括可以使诸如以下的材料氮化：奥氏体钢或镍合金，即不像铁素体或马氏体钢那样有效地扩散氮的金属材料。但是，这些方法也有一些缺点。对于传统的等离子体氮化，工程师必须处理边缘效应，这使得很难将这种方法用于复杂形状的部件。反过来，在主动屏幕等离子体氮化的情况下，问题消失了。与使用常规方法形成的层相比，形成了均匀，光滑的层，但是更薄，更软并且不具有耐摩擦性。结合这些方法的研究也在进行中，即在阴极电势下在常规等离子体氮化中使用有源筛。但是，缺乏全面的数据来比较这三种氮化工艺与脉动电流对奥氏体钢表面微观结构和功能性能形成的影响之间的比较。本文介绍了在辉光放电氮化过程中，在阴极电势，等离子电势和结合有源筛网的阴极电势下，奥氏体X2CrNiMo17-12-2（AISI？316L）不锈钢上产生的氮化层的特征。所有过程均在440°C，直流辉光放电条件下和100？kHz频率脉动电流下进行。检查了这些层的微观结构，相和化学组成，形态，表面粗糙度，硬度，耐磨性和耐腐蚀性。研究表明，所用氮化方法的类型和电学条件对合金的影响很大。形成的扩散层的微观结构和性能。

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