Flux effect on the ion-beam nitriding of austenitic stainless-steel AISI 304L
Flux effect on the ion-beam nitriding of austenitic stainless-steel AISI 304L
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熔剂对奥氏体不锈钢 AISI 304L 离子束渗氮的影响
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
N. Barradas
中科院分区：
文献类型：
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作者：
G. Abrasonis;J. Rivière;C. Templier;L. Pranevičius;N. Barradas
研究了熔剂和氩预处理对奥氏体不锈钢离子束氮化的影响。离子能量和温度分别为1.2keV和400℃，离子电流密度分别为0.5、0.67和0.83mAcm−2。用核反应分析法测定了氮的分布曲线。利用溅射和扩散引起的氮化层厚度演变和捕集-脱集模型对所得的氮分布曲线进行了分析。两种方法都能很好地拟合实验结果，但对于不同的电流密度，必须假设不同的扩散系数。此外，电流密度越大，扩散系数越高。另一方面，氮化温度下的ar离子束预处理只产生热效应，对后续的氮扩散没有其他影响。结果与表面和温度效应以及原子输运机制有关。
The effect of flux and Ar pretreatment during ion-beam nitriding of austenitic stainless steel is investigated. The ion energy and temperature were 1.2keV and 400°C, respectively, the ion current densities were 0.5, 0.67, and 0.83mAcm−2. The nitrogen distribution profiles were measured using nuclear reaction analysis. The obtained nitrogen distribution profiles were analyzed by the means of the nitrided layer thickness evolution due to sputtering and diffusion and the model of trapping–detrapping. Both approaches could fit well the experimental results, however, different diffusion coefficients have to be assumed for each current density. In addition, the diffusion coefficients are higher for higher current densities. On the other hand, it is shown that the pretreatment with Ar-ion beam at nitriding temperatures produces only a thermal effect without any other influence on the following nitrogen diffusion. The results are discussed in relation with surface and temperature effects and atomic transport mech...