YANG Jilian ZHANC Baisheng DINC Yongfan China Institute of Atomic Engergy
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Beijing
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ChinaYANG Yingchang ZHANG Xiaodong Peking University
,
Beijing
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ChinaPAN Shuming General Research Institute for Non-Ferrous Metals
,
Beijing
,
China associate professor
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P.O.Box 275
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Branch No.30
,
Beijing 102413
,
China
金属学报(英文版)
The N occupying sites and magnetic structures in R_2Fe_(17)N_x(R=Y,Dy,Nd)are de- termined by neutron diffraction.The effects of the site occupation of N on magnetic properties are discussed primarily.
关键词:
neutron diffraction
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null
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null
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null
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null
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null
戴成珂
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赵刚
,
徐耀文
,
毛新平
,
韩斌
,
蔡珍
钢铁
doi:10.13228/j.boyuan.issn0449-749x.20150570
在实验室模拟CSP工艺的加热条件，对30CrMo钢进行试验，用金相法测量脱碳层厚度，用失重法对30CrMo钢的氧化层厚度进行估算，结合氧化烧损研究了加热温度和保温时间对30CrMo钢的实际脱碳层厚度的影响规律。结果表明，在试验气氛为（体积分数，%）CO216.5、O20.8、H2O13、N269.7，加热温度范围为1000～1150℃时，30CrMo钢的实际脱碳层厚度随着加热时间的增加而增加，低于1050℃时，脱碳层厚度随着温度升高而增加，高于1050℃时，脱碳层由于氧化加剧而减少，1050℃为脱碳敏感温度。
关键词:
30CrMo
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脱碳
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氧化
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试验
李智丽
物理测试
对发生滞后断裂的30MnSi钢筋进行了检测分析，经检验其断裂的原因为钢筋在热处理加热时钢筋与加热线圈接触打火表面产生了异常的马氏体组织，由于该组织的内应力较大导致钢筋滞后断裂。
关键词:
钢筋
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fracture
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analysis
李智丽
物理测试
对发生滞后断裂的30MnSi钢筋进行了检测分析,经检验其断裂的原因为钢筋在热处理加热时钢筋与加热线圈接触打火表面产生了异常的马氏体组织,由于该组织的内应力较大导致钢筋滞后断裂.
关键词:
钢筋
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断裂
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分析
QI Yunxin Nei Monggol Institute of Metallic Materials
,
Baotou
,
China QI Yunxin
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Professor
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P.O.Box No.4
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Baotou 014034
,
Nei Monggol
,
China
金属学报(英文版)
The nitride in 30CrNi steel and its composition along boundaries have been studied by means of scanning Auger microprobe.The nitride identified metallographically is Zr(C,N)which contains a small amount of Ti and O.The interface width between the Zr(C,N)and the matrix is about 1.6 μm.An Fe-rich shell is.found on the surface of Zr(C,N)which appeared on the fracture surface.The thickness of shell is 0.1-0.8μm.The Fe concentration of its outmost layer is 3-18 at.-% and decreases exponentially along the depth direction.
关键词:
nitride
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null
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null
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null
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null
周立新
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李波
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陈方玉
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刘光辉
物理测试
针对30CrMnSiA碰撞断裂样品,经宏观分析并采用扫描电子显微镜微观断口观察,配合能谱仪成分分析,及金相显微镜组织观察可知,断面原有陈旧性大裂纹,深达管厚一半,碰撞断裂起始于陈旧裂纹根部,是陈旧裂纹再扩展。主裂缝根部晶粒粗大,缝旁有大型氧化铝夹渣及点状内氧化物,缝边脱碳,陈旧裂纹形成与穿管有关。穿管裂纹与大型夹渣及局域粗晶,共同造成碰撞非正常断裂。其中,夹杂物和粗晶区域是管材断裂主要原因。
关键词:
扫描电镜
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裂纹
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氧化铝夹渣
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粗晶组织
周立新
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李波，陈方玉，刘光辉
物理测试
针对30CrMnSiA碰撞断裂样品，经宏观分析并采用扫描电子显微镜微观断口观察，配合能谱仪成分分析，及金相显微镜组织观察可知，断面原有陈旧性大裂纹，深达管厚一半，碰撞断裂起始于陈旧裂纹根部，是陈旧裂纹再扩展。主裂缝根部晶粒粗大，缝旁有大型氧化铝夹渣及点状内氧化物，缝边脱碳，陈旧裂纹形成与穿管有关。穿管裂纹与大型夹渣及局域粗晶，共同造成碰撞非正常断裂。其中，夹杂物和粗晶区域是管材断裂主要原因。
关键词:
扫描电镜
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crack
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alumina slag
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big grain
何镇乾
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陈继志
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冯梦菊
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朱源太
金属学报
本文结合生产研究了碱性电炉冶炼30航空结构钢材中的发纹问题。大量生产检验结果的统计分析指出:发纹的平均长度与钢材尺寸有密切的关采,钢锭锻轧成材后,钢材直径越小,则出现的发纹也越长;340×340公厘见方的钢锭当加工成60～70公厘直径的钢材时出现发纹的机率最大;同时钢材中发纹分布与钢锭原来部位也有一定的关系。产生发纹的原因是由于链状非金属夹杂物的存在,如铁尖晶石(AL_2O_3·FeO)和铁尖晶石与刚玉的混合物(Al_2O_3·FeO;Al_2O_3)之类。生产试验证明:改善脱氧、采用不同的锻造比以及在锻造过程中进行扒皮可以大大减少以至完全消灭钢中发纹。
关键词:
International Journal of Hydrogen Energy
A porous nickel support was successfully prepared by uniaxial compression of nickel powders. Microstructures and mechanical properties of Nb(40)Ti(30)Ni(30) membranes fabricated by magnetron sputtering were investigated. Deposited and annealed Nb(40)Ti(30)Ni(30) membranes consisted of amorphous and crystalline phases, respectively. Higher base temperature was shown to increase the hardness and elastic modulus of the Nb(40)Ti(30)Ni(30) membrane, Pd/Nb(40)Ti(30)Ni(30)/Pd/porous nickel support composite membranes were then fabricated using a multilayer magnetron sputtering method. The hydrogen permeability of the composite membranes with amorphous and crystallized Nb(40)Ti(30)Ni(30) metal layer was measured and compared with that of self-supported Nb(40)Ti(30)Ni(30) and Pd alloys. Solid-state diffusion was shown to be the rate-controlling factor when the thickness of the Nb(40)Ti(30)Ni(30) layer was about 12 pm or greater, while other factors were in effect for thinner layers (such as 6 pm). The Pd/Nb(40)Ti(30)Ni(30)/Pd/porous nickel support composite membrane exhibited excellent permeation capability and satisfactory mechanical properties. It is a promising new permeation membrane that could replace Pd and PdAg alloys for hydrogen separation and purification. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
关键词:
Porous nickel support;Magnetron sputtering;Composite membrane;Amorphous;Hydrogen permeation;Solid-state diffusion;ti-ni alloys;permeation characteristics;palladium;microstructures;permeability;transport;tantalum;niobium;model;glass
