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Expanded austenite by low temperature plasma nitriding of austenitic stainless steels pushes carbon ahead of the nitrided layer. Apparently, this phenomenon accompanies uphill carbon diffusion. Clarifying the mechanism of this carbon push-ahead effect is important for controlling treated-layer microstructure. This investigation is intended to clear the push-ahead effect of specimens treated with a combination of carburizing and nitriding. Plasma treatments were carried out for 18Cr–8Ni steel in 667 Pa at 673 K. We used the following gas-flow ratios: 80% N2–20% H2 for nitriding; Ar gas mixed with 5% CH4 for carburizing; and 80% N2 mixed with from 5% CH4 and balancing H2 for simultaneous carburizing and nitriding. Glow-discharge optical emission spectroscopy (GDOES) indicated an accumulated carbon layer beyond the nitrogen plateau on the nitrided specimen of pre-carburized sample. Such a carbon accumulation profile also resulted from simultaneous treatment. Furthermore, carbon accumulated similarly in cases of carburizing after nitriding treatment. Nitrided specimens of pre-carburized samples have a small carbon peak just under the surface on GDOES profile. This small carbon peak weakened and disappeared with increasing nitriding time. X-ray diffraction analysis revealed formation of e (Fe2–3N) phase just under the surface of the nitrided pre-carburized sample. |
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感谢参与，应助指数 +1
hotday(金币+1): 感谢应助~ 2012-03-11 00:30:18
bichun: 回帖置顶 2012-03-11 18:27:49
感谢参与，应助指数 +1
hotday(金币+1): 感谢应助~ 2012-03-11 00:30:18
bichun: 回帖置顶 2012-03-11 18:27:49
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通过对不锈钢奥氏体低温等离子体氮化得到的扩张奥氏体被推动扩散到氮化层前。显然，这个现象伴随着上坡碳原子扩散。弄清楚这种碳推效应机制对于氮化覆层显微结构控制是具有重要意义的。本次研究的目的是弄清被渗碳渗氮综合处理过试样的碳推效应。 18Cr–8Ni钢在压力677帕温度673K条件下进行等离子体处理。气流组成为：氮化气体为80% 氮气加20% 氢气; 碳化用气体问掺入%甲烷气体的氩气； 氮碳化用气体为80%氮气+5%甲烷+15%氢气。发射光谱分析（GDOES）结果显示先渗碳处理后渗氮处理的试样氮化层外出现了碳累积层。渗碳渗氮同步处理也能得到这样的碳累积层。 进一步研究表示：碳累积层中的碳原子累积行为和先渗氮后渗碳处理时碳原子的行为时一致的。GDOES图片显示先渗碳后渗氮试样表层下的碳含量达到一个小高峰值。碳含量的峰值会随着碳化时间的延长而慢慢降低直至消失。X射线衍射分析揭示了先渗碳后渗氮试样表层下e相的存在。 翻译的不是很好，但希望有助于你的理解。 |
4楼2012-03-10 18:23:06