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Behaviors of Lanthanum and Cerium on Grain Boundaries in Carbon Manganese Clean Steel 总被引:5,自引:0,他引:5
The behaviors of La and Ce on gram boundaries in carbon manganese clean steel were investigated by high-reso- lution transmission elecetron microscope (HRTEM), scanning elecetron microscopy(SEM ), energy dispersive spectrometer (EDS) and X-ray diffraction(XRD) analysis. The existing forms of rare earths (RE) in clean steel were as follows: dissolved in sohd solution, forming inclusion or second phase containing RE (RE-Fe-P, La-P, Fe-La eutectic and Fe-Ce phase). The dissolved La or Ce segregated at grain boundaries. The segregation of both S and P at gram boundaries was reduced with suitable RE content. The impact toughness of the steel was improved obviously. La and Ce had effecets on purifying molten steel and modifying inclusions in clean steel, whereas with excessive La or Ce, La-Fe-P, La-P and Fe-La eutecetic phase or Ce-Fe-P and Fe-Ce intermetallic compound would form along grain boundaries, causing the impact energy to decrease significantly. 相似文献
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插画是世界通用的语言。插画艺术从直接的角度看,视觉是最主要的感受、拥有、享受生活的方式。插画对社会的各个层面都产生了积极的影响。它也日益成为21世纪人们视觉需求的中心,成为传播媒介必不可少的视觉语言。本文从插画中的元素对插画进行一定的探讨,以及在对插画不同元素形式的分析了解中得出插画作为信息时代的传播载体成为视觉时代发展的视觉语言。 相似文献
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Europium and terbium complexes with strong fluorescence intensity and long fluorescence lifetime were prepared. By replacing half of the europium or terbium ion with M (M = Zn^2+, Cd^2+, and Cr^3+) using the doped method, and then incorporating it with 18-crown-6 ether and terephthalic acid, six heteronuclear samples EuZnLL'Cl3·3H2O(1), EuCdLL2'Cl3·5H2O(2), EuCrLL'Cl4· 4H2O(3), TbZnLL'Cl3·4H2O(4), TbCdLL'2Cl3·4H2O(5), and TbCrLL'2Cl4 ·4H2O(6) (L = terephthalic acid, L'= 18-Crown-6 ether) were obtained. The elemental analysis, molar conductivities, rare earth complexometry, Fourier Transform Infrared Spectroscopy (FT-IR), ultraviolet (UV), TGA, fluorescence intensity, and fluorescence lifetime of the samples were measured. The results showed that there were good luminescence properties for heteronuclear complexes (1), (2), (4), and (5), which were even stronger than those of the homonuclear complexes Eu2LL'2Cl4·4H2O and Tb2LL'2Cl4 ·4H2O, but the luminescence properties of EuCrLL'Cl4·4H2O, TbCrLL'Cl4·4H2O were very weak. A possible luminescence mechanism was suggested by the organic-inorganic doped mechanism and the law of intramolecular energy transfer. 相似文献
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王振宇 《Canadian Metallurgical Quarterly》2011,(15)
歌剧《茶花女》在世界歌剧舞台上成功的主要原因是它迎合了观众最普遍的审美喜好。其一,歌剧脚本的成功改编使得剧情更容易被广大观众接受并为之感动。其二,歌剧音乐的整体布局与戏剧内容的完美结合以及那些让人如痴如醉的优美旋律。 相似文献
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综述残余元素,有害元素以及不同类型的非金属夹杂物对轴承钢接触疲劳性能的影响及其在冶金过程中的控制。 相似文献
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采用火花发射光谱仪分析纯铜中微量的杂质元素,进而用差减算出铜的含量。高频高能光源缩短了分析周期,时间光谱分解技术(TRS技术)和高纯液氩流量的增加,能提高痕量杂质元素的灵敏度,消除共存元素的干扰,多元回归时工作曲线的线性较好。实验结果表明,分析数据的精度和准确度能满足纯铜中杂质元素的分析要求。本法适用于高纯铜、纯铜(T1、T2)、无氧铜(TU1、TU2)等中的杂质元素的快速分析。 相似文献
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试述残余元素对电炉钢带肋钢筋性能的影响程度,分析其原因,研究由此引起的屈服上点不明显的测试办法,并从废钢管理,冶炼,轧制及检验提出系统控制的经验措施。 相似文献
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金属材料中气体元素的有益作用 总被引:1,自引:0,他引:1
一般将H、N、O作为金属材料中有害气体元素考虑,因而设法降低它们的含量。本文从工艺和性能分析它们的有益作用之后,讨论了处理材料问题时的四个观点:利害、经济、基础、环境。 相似文献
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