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首页> 外文会议>IEEE International Conference on Plasma Sciences >Nitriding of super-ferritic stainless steel by plasma immersion ion implantation in radio frequency and ECR-microwave plasma system
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Nitriding of super-ferritic stainless steel by plasma immersion ion implantation in radio frequency and ECR-microwave plasma system

机译：超铁素体不锈钢在射频和ECR微波等离子体系统中的等离子体浸没离子植入氮化

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Stainless steel 470 Li-24 Cr and 460Li-21 Cr are two new generation super-ferritic nickel free grades, contains titanium (Ti), niobium (Nb) and very small percentage of carbon (C) and nitrogen (N). The Ti and Nb enhance the corrosion resistance while the low interstitial content of C and N leads to finer precipitates and greater ductility. These grades are economic alternative to 316L and 304 with corrosion resistance comparable or superior. However, as 316L and 304 can be nitrided efficiently to improve the mechanical surface properties like hardness and wear; it has to be asked whether these new generation super-ferritic grade stainless steels can be improved further by plasma nitriding too. Two sets of experiments have been carried out, one with capacitively coupled radio frequency Plasma at PUC Chile and the other is microwave plasma at IOM Leipzig, to investigate further improvements in the mechanical properties of 470 Li-24 Cr and 460Li-21 Cr steel. Nitrided and unnitrided substrates are further investigated using different surface characterization techniques including secondary ion mass spectroscopy, scanning electron microscopy, energy dispersive x-ray analysis, Vickers hardness, wear resistance, corrosion test etc. In most of the characterizations the nitrided 470 Li-24 Cr and 460Li-21 Cr shows similar results. Increase of surface roughness for higher treatment temperature is observed in both the experiments, independent of the steel types. The formation of chromium nitride compound takes place at treatment temperature around 400oC-450oC, and it increases with further increase in temperature. But at higher temperature corrosion property deteriorate. The characterization results show up to 25% of nitrogen, 4–5 times increased in hardness and diffusion of nitrogen layer up to 4–6 micron for different experimental conditions. The samples implanted with temperature higher than 400°C presented wear resistance values aroun- two orders of magnitude higher than the others.
机译：不锈钢470栗-24 Cr和460Li-21铬两个新一代超铁素体不含镍等级，包含钛（Ti），铌（Nb）和碳（C）的非常小的比例和氮（N）。的Ti和Nb的提高而C和N导致更细的析出物和更大的延展性的低间隙含量耐腐蚀性。这些牌号是经济的替代316L和耐腐蚀性同304相当于或优于。然而，如316L和304可以有效地氮化，以改善像硬度和磨损的机械表面性能;它必须被询问是否这些新一代超级铁素体不锈钢的不锈钢还可以通过等离子渗氮也提高。两组实验已经在PUC智利被执行，一个与电容耦合射频等离子体，而另一个是微波等离子体在IOM莱比锡，调查在470立-24 Cr和460Li-21 Cr钢的机械性能的进一步改进。氮化和unnitrided衬底使用不同的表面表征技术包括二次离子质谱法进一步研究，扫描电子显微镜，能量色散X射线分析，维氏硬度，耐磨损性，耐腐蚀性试验等。在大多数表征的氮化470栗-24的Cr和460Li-21铬示出类似的结果。对于较高的处理温度的表面粗糙度的增加在两个实验中，独立的钢种中观察到。氮化铬化合物的形成发生在400℃左右，450℃处理温度，并将其与温度的进一步增加而增加。但是，在较高温度下腐蚀性降低。表征结果显示多达氮的25％，4-5倍的硬度和氮气层的向上扩散增加至4-6微米为不同的实验条件。随温度的植入高于400℃的样品呈现耐磨性值aroun-两个数量级高于其它。

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