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利用多极板赝火花放电装置产生的高功率脉冲电子束对不同类型的钢, 如45#, 65Mn, T8, 9Cr18和GCr15等进行轰击, 研究其在金属材料表面改性中的应用. 样品表面的显微硬度和耐腐蚀性测试结果以及扫描电子显微镜(SEM)的观察分析表明, 经电子束轰击后, 这些材料在结构、组织和性能上发生了明显的变化, 轰击中心区域的显微硬度和耐蚀性明显提高. 基于一维热传导方程对材料表面的冷却速率进行了估算, 对电子束与金属材料的作用过程进行了理论分析. 结果表明, 高功率密度脉冲电子束与金属材料相互作用, 表面冷却速率高达1. 2×1012 ℃/s, 使材料表面局部瞬间达到熔化, 产生骤热急冷过程. High power density electron beams generated by multiplate pseudospark discharge chamber, have been used to bombard various kinds of steel targets such as 45#, 65Mn, T8, 9Cr18, GCr15, etc, and studyits applications for modification of metal surface. The microhardness and corrosive resistance property have been measured and the morphology was obtained by using SEM analysis. The results showed that the surface properties and structure of the matevials bom barded have been modified; in the bombarded center area, the microhardness as well as corrosive resistance property was improved obviously. The interactions befween the electron beam and metal materials were theoretically considered and discussed on the basis of simple calculation with one dimensional thermal transfer equation. It showed that the cooling rate of metal surface with 1.2×1012 ℃/s was so high that caused the metal surface instant melted, and abrupt cooled. 相似文献
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基于电场递增效应理论，讨论了多极板赝火花脉冲电子束的特征.通过电子束对固体变色片和金属靶的轰击，对赝火花电子束的不稳定性、细丝效应和自箍缩效应等现象做了研究和分析.The characteristics of pulsed electron beam generated by multiplate pseudospark chamber (MPC) on the basis of field escalation effects have been described in this paper. The phenomena such as instability, filament effect, and self-pinch effect of pseudospark electron beam were studied and analyzedby the bombardment of solid evident films and metal targets. 相似文献
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1前言非结构化网格流场数值模拟是近十几年来计算流体力学发展的重要标志之一。非结构网格与结构网格相比，在网格划分的灵活性上远远超出，这正好是复杂区域划分所必需的。非结构网格可在某一局部加密，修改而不影响其余部分，用于自适应网格时其方便处也是结构网格所无法比拟的。非结构网格划分的灵活性和加密、修改的方便，使它得以在复杂几何结构流动的计算中得以充分应用，十几年来成为计算流体力学界的潮流，得到了大发展［‘－‘］本文在三角划分的计算域上，进行了二维无粘流场数值计算。采用Roe格式离散二维Euler方程组，三步Run… 相似文献
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