In-situ X-ray investigations of phase formation and diffusion during low energy nitrogen ion implantation into austenitic stainless steel

奥氏体不锈钢低能氮离子注入过程中相形成和扩散的原位 X 射线研究

• 批准号: 109628851
• 负责人: Dr. Darina Manova
• 金额: --
• 依托单位: Leibniz-Institut für Oberflächenmodifizierung e.V. (IOM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/109628851?language=en
• 关键词: situ; ray; investigations; phase; formation

Nitrogen insertion into transition metals is in general associated with nitride formation, e.g. CrN or Fe3N. However, the fcc phase austenitic stainless steel incorporates nitrogen in solid solution with up to 30 at.% at temperatures between 350 and 400 °C, accompanied by an anisotropic lattice expansion of 5 – 15%. At the same time, a rapid diffusion of nitrogen from the surface into the bulk – following a d(t) α t1/2 law – is observed. Numerous exsitu experiments show diverging results with competing models for the phase formation proposed by different groups. In this project, in-situ X-ray diffraction experiments for low energy nitrogen ion implantation into fcc austenitic stainless steel (and related materials) for varying process temperatures, ion energy and ion current density are proposed to obtain a better understanding of the underlying processes. The existing models will be verified against the experimental results and modified and refined. Beside insights into radiation enhanced diffusion, additional information on the phase formation and stability of high nitrogen phases for transition metals of the iron group will be obtained.

氮插入过渡金属通常与氮化物的形成有关，例如CrN或Fe3N。然而，面心立方相奥氏体不锈钢在350-400℃的温度下，固溶体中的氮含量高达30at.%，并伴随着5%-15%的各向异性晶格膨胀。同时，观察到氮从表面向体相的快速扩散，符合d(T)αt1/2定律。大量的现场实验表明，不同研究小组提出的形成相的竞争模型的结果是不同的。为了更好地理解低能氮离子注入FCC奥氏体不锈钢(及相关材料)的过程，本项目提出了不同工艺温度、离子能量和离子电流密度的原位X射线衍射实验。现有的模型将根据实验结果进行验证，并进行修改和改进。除了对辐射增强扩散的洞察外，还将获得关于铁族过渡金属的高氮相的相形成和稳定性的额外信息。

项目成果

Influence of temperature on layer growth as measured by in situ XRD observation of nitriding of austenitic stainless steel

奥氏体不锈钢渗氮过程中温度对层生长的影响原位XRD观察

• DOI: 10.1016/j.nimb.2012.11.056
• 期刊: Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
• 影响因子: 1.3
• 作者: D. Manova;C. Günther;A. Bergmann;S. Mändl;H. Neumann;B. Rauschenbach
• 通讯作者: B. Rauschenbach