NIU Tao
,
KANG Yong-lin
,
GU Hong-wei
,
et al
钢铁研究学报(英文版)
Using TEM, electron diffraction, EDX analysis and physicochemical phase analysis, the morphology, crystal structure, size distribution and chemical composition of precipitates in the microstructure of high strength Nb-microalloyed X100 pipeline steel were investigated, and the strengthening effect of precipitation was quantitatively calculated with Ashby-Orowan correction model. The precipitates obtained in X100 pipeline steel can be divided into two kinds: “complex” and “single” particles by morphology. The EDX analysis of single precipitates reveals that the chemical composition matches well with particle dimensions, especially the Nb/Ti ratio regularly reduces with the increase of particle size. The yield strength increments in the way of precipitation strengthening of X100 pipeline steel reached about 52MPa, which suggests that the precipitation strengthening is not the dominative strengthening mechanism for X100 pipeline steel.
关键词:
X100 pipeline steel;carbonitride;precipitation behavior;strengthening effect
X.B. Tian
,
X.F. Wang
,
A.G. Liu
,
L.P. Wang
,
S. Y. Wang
,
B. Y. Tang and P. K. Chu 1)Advanced Welding Production & Technology National Key Laboratory
,
Harbin Institute of Technology
,
Harbin 150001
,
China 2)Department of Physics & Materials Science
,
City University of Hong Kong
,
China
金属学报(英文版)
The research on plasma immersion ion implantation has been conducted for a little over ten years. Much is needed to investigate including processing technlogy, plasma sheath dynamics, interaction of plasma and surface, etc. Of the processing methods elavated temperature technique is usually used in PIII to produce a thick modified layer by means of the thermal diffusion. Meanwhile plasma ion heating is more recently developed by Ronghua Wei et al[1]. Therefore the temeperature is a critical parameter in plasma ion processing. In this paper we present the theoretical model and analysize the effect of imlantation voltage, plasma density, ion mass,etc on the temperature rise.
关键词:
plasma immersion ion implantation
,
null
,
null
夏小建
量子电子学报
doi:10.3969/j.issn.1007-5461.2009.06.010
采用Wei-Norman方法,求出含时变电压源的介观LC电路随时间演化的精确解,应用相空间准概率分布函数,研究了时变电源作用下介观LC电路相干态的量子特性,结果表明此函数是一个二维运动的Gauss波包,其中心电量和磁通呈余弦和正弦变化.
关键词:
量子光学
,
LC回路
,
介观电路
,
相干态
,
量子态演化
,
相空间的准概率分布函数
陈志钢
,
唐一文
,
张丽莎
,
张新
,
贾志勇
,
余颖
材料科学与工程学报
doi:10.3969/j.issn.1673-2812.2005.04.025
以透明导电玻璃(TCO)、纳米TiO2/TCO、CNTs/TCO、铜片分别为工作电极,用简单铜盐通过阴极还原制备了Gu2O薄膜,并研究了溶液温度和衬底对电化学沉积Gu2O薄膜形貌的影响.结果表明:以TCO和铜片为衬底时,由于表面微粒为微米级,不管溶液温度高低,只能得到微米级的Cu2O薄膜;以纳米TiO2/TCO和CNTs/TCO为衬底,池温高于30℃只能得到微米级的Cu2O薄膜,而池温降到0℃时,都可得到纳米Cu2O.
关键词:
氧化亚铜
,
电沉积
,
溶液温度
,
衬底
李强
,
宣益民
工程热物理学报
建立了测量小通道扁管内纳米流体流动与对流换热性能的实验系统,测量了不同粒子体积份额的水-Gu纳米流体的管内对流换热系数和摩擦阻力系数,实验结果表明,在相同雷诺教条件下,小通道扁管内纳米流体的对流换热系数大于纯液体,且随粒子的体积份额的增加而增大,而纳米流体的阻力系教并未明显增大.
关键词:
纳米流体
,
强化传热
,
小通道扁管
WEI Jihe Xi'an Institute of Metallurgy and Construction Engineering
,
China.
材料科学技术（英）
The oxidation of alloying elements during the ESR of stainless steel has been studied. The model previously developed by WEI and Mitchell for the chemical reactions and mass transfer processes during ESR was applied to the remelting of the high Cr steel 1Cr18Ni9(Ti).The laboratory data for the unsteady state A.C.ESR were analyzed and dealt with by the model.When the remelting process reached a steady state,an oxidant(Fe_2O_3 powder)or a deoxidant(Ca-Si powder or metallic Ca)was added to the slag bath.The results showed that this model is applicable to the remelting of stainless steel rather precisely, and it is expected that the model may offer a reliable basis for the control of composition during practical ESR of high alloy steel. Also,the oxidation of Cr in the steel must be noticed when its content is high;but it is entirely possible to adjust the Cr content of ingot within a considerable range,using a special technique by means of the slag-metal reactions during the remelting.
关键词:
ESR
,
null
,
null
,
null
,
null
董企铭
,
苏娟华
,
刘平
,
李贺军
,
康布熙
材料热处理学报
doi:10.3969/j.issn.1009-6264.2004.03.010
通过能谱和透射电镜分析研究了Gu-0.3Cr-0.15Zr-0.05Mg合金的时效析出,在4790℃时效4h形成了有序的原子排列,其化合物类型为CrCu2(ZrMg);同时存在体心的Cr相和面心的Cu4Zr相,在晶界上有少量未溶的Cr粒子.细小弥散的析出相使合金的性能得以提高,470℃时效4h～6h,硬度和导电率分别达109～108HV,79%IACS～80%IACS.
关键词:
Cu-Cr-Zr-Mg合金
,
微观组织
,
析出
,
时效性能
