材料期刊网

Microstructure and Fracture Morphology in the Welding Zone of T91 Heat-resisting Steel Used in Power Station

Yajiang LI , Bing ZHOU , Tao FENG , Jiangwei REN

材料科学技术（英文）

Microstructure performance in the welding zone of T91 heat-resistant steel under the condition of TIG welding was researched by means of metallography, X-ray diffraction and scanning electron microscope (SEM).Experimental results indicated that microstructure of T91 weld metal was austenite + a little amount of d ferrite when using TGS-9cb filler wire.Substructure inside the austenite grain was crypto-crystal lath martensite, on which some Cr23C6 blocky carbides were distributed. The maximum hardness (HRC44) in the welding zone is near the fusion zone. There existed no obvious softening zone in the heat-affected zone (HAZ). For T91 steel tube of F63 mm×5 mm, when increasing welding heat input (E) from 4.8 kJ/cm to 12.5 kJ/cm, fracture morphology in the fusion zone and the HAZ changed from dimple fracture into quasi-cleavage fracture (QC). Controlling the welding heat input of about 9.8 kJ/cm is suitable in the welding of T91 heat-resistant steel.

关键词: T91 heat-resistant steel , null , null

Microstructure in the weld metal of austenitic-pearlitic dissimilar steels and diffusion of element in the fusion zone

Yajiang LI , Zengda ZOU , Bing ZHOU

材料科学技术（英文）

Microstructure and alloy element distribution in the welded joint between austenitic stainless steel (1Cr18Ni9Ti) and pearlitic heat-resistant steel (1Cr5Mo) were researched by means of light microscopy, scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). Microstructure, divisions of the fusion zone and elemental diffusion distributions in the welded joints were investigated. Furthermore, solidification microstructure and S-ferrite distribution in the weld metal of these steels are also discussed.

关键词:

LOCAL-STRUCTURE OF THE AXIAL FE3+ CENTER IN THE K+ SITE OF A KTAO3 CRYSTAL

Physical Review B

In order to understand the unusually large value of zero-field splitting D for the axial Fe3+ center in a KTaO3 crystal, Zhou made two assumptions in his recent report [Phys. Rev. B 42, 917 (1990)]. In this Comment we will show that his assumption II is qualitatively reasonable, whereas assumption I is unnecessary and doubtful.

关键词: electric-field;srcl2

First-principle study of electronic properties of Ti3Si1-xAlxC2 solid solutions

Journal of Physics and Chemistry of Solids

The layered ternary ceramics Ti3SiC2 and Ti3AlC2 are isostructural and can form Ti3Si1-xAlxC2 solid solutions combining the advanced properties of both compounds [H.B. Zhang, Y.C. Zhou, Y.W. Bao, M.S. Li, Improving the oxidation resistance of Ti3SiC2 by forming a Ti3Si0.90Al0.1C2 solid solution, Acta Mater. 52 (2004) 3631-3637; E.D. Wu, J.Y. Wang, H.B. Zhang, Y.C. Zhou, K. Sun, Y.J. Xue, Neutron diffraction studies of Ti3Si0.9Al0.1C2 compound, Mater. Lett. 59 (2005) 2715-2719; J.Y. Wang, Y.C. Zhou, First-principles study of equilibrium properties and electronic structure of Ti3Si0.75Al0.25C2 solid solution, J. Phys.: Condens. Matter 15 (2003) 5959-5968; Y.C. Zhou, J.X. Chen, J.Y. Wang, Strengthening of Ti3AlC2 by incorporation of Si to form Ti3Al1-xSixC2 solid solutions, Acta. Mater. 54 (2006) 1317-1322]. In the present work, the solid solutions of Ti3Si1-xAlxC2 (x = 0, 0.25, 0.33, 0.5, 0.67, 0.75, 1) are investigated by first-principle calculations based on pseudo-potential plan-wave method within the density functional theory framework. The results show that as Al content increases in the solid solution, all the bonds have weakened to certain extents, which lead to an unstable structure both energetically and geometrically. The calculated results are compared and discussed with the reported data for the Ti3Si1-xAlxC2 solid solutions. (c) 2007 Elsevier Ltd. All rights reserved.

关键词: ceramics;ab initio calculations;electronic structure;electrical;conductivity;oxidation behavior;mechanical-properties;ti3sic2;temperature;ti3alc2;air;si

SYNTHESIS OF TiN FILM WITH ION BEAM ENHANCED DEPOSITION AND ITS PROPERTIES

ZHOU Jiankun LIU Xianghuai CHEN Youshan WANG Xi ZHENG Zhihong HUANG Wei ZOU Shichang Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , China

金属学报(英文版)

The TiN films were synthesized with an alternate process of depositing titanium from a E-gun evaporation source and 40 keV N~+ bombarding onto the target.It is shown from the composi- tion analysis and structure investigations using RBS,AES,TEM,XPS and X-ray diffraction spectrum that the formed fihns are mainly composed of TiN phase with grain size of 30—40 nm and without preferred orientation,the nitrogen content in the film is much less than that in case without N~+ bombarding,and an intermixed region about 40 nm thick exists between the film and the substrate.The films exhibt high microhardness and low friction. ZHOU Jiankun,Ion Beam Laboratory,Shanghai Institute of Metallurgy,Academia Sinica, Shanghai 200050,China

关键词: TiN film , null

高PPI ADS产品白Mura不良产生原理及改善研究

桑胜光 , 车晓盼 , 王嘉黎 , 郭红光 , 井杨坤 , 李泽 , 游伟

液晶与显示 doi:10.3788/YJYXS20163105.0435

现有传统TFT-LCD生产工艺中,Rubbing工艺在生产高PPI ADS产品的过程中,在改善Rubbing Mura不良时会使用H Cloth,但使用H Cloth Glass在经过Rubbing后ODF Rubbing Cleaner清洗时会出现白Mura不良.经过对白Mura不良Panel的微观解析,并结合H Cloth性质分析出白Mura不良是由于H Cloth自身的聚醋酸脂颗粒经过Rub-bing Cleaner聚集造成的.从Rubbing Cleaner清洗时改变Glass表面性质(醇类可以有效改变界面性质)入手,通过使用IPA对Glass进行清洗以改变聚醋酸脂疏水性,使得聚醋酸脂颗粒更易被Rubbing Cleaner清洗掉来改善白Mura不良,并结合生产实际定期对IPA进行更换以保持IPA浓度处于一个稳定的区间,使得高PPI ADS产品白Mura不良发生率由改善前的3.42％降低至改善后的0.11％,白Mura不良得到非常有效的改善.

关键词: 高PPI , 白Mura不良 , 聚醋酸脂 , 疏水性

ABSORPTION-SPECTRUM AND ZERO-FIELD SPLITTING OF Y3FE5O12

Physical Review B

The assignment of the absorption spectrum of Y3Fe5O12 (YIG) made by Scott et al. [Phys. Rev. B 10, 971 (1974)] is shown to be incorrect and a new one is made by diagonalizing the complete cubic crystal-field matrices for d5 ions, involving spin-orbit interaction, given by Zhou et al. [Phys. Rev. B 44, 7499 (1991)]. The Racah parameters B and C, the crystal-field parameter Dq, and the spin-orbit coupling coefficient zeta are determined (in units of cm-1) as B = 783.3(530), C = 2928(3220), Dq = 1336(1300), zeta = 395 for octahedral Fe3+, and B = 606.1(705), C = 2696(2730), Dq = -1117.3(560), zeta = 335 for tetrahedral Fe3+, where the numerals in parentheses are the values adopted by Scott et al. Furthermore, the cubic zero-field splitting parameter a of Fe3+ in YIG is calculated to be a(oct) = 156 X 10(-4) cm-1 and a(tet) = 58.6 X 10(-4) cm-1. The value for a(oct) differs from the value of 189 X 10(-4) cm-1 found for Fe3+ in Y3Ga5O12:Fe3+. These results support speculations made by Geschwind [Phys. Rev. 121, 363 (1961)].

关键词: fe3+;mn2+

天然气井油管悬挂器腐蚀失效分析

刘守平 , 周上祺 , 王佳眉 , 任勤

腐蚀学报（英文）

用金相显微镜、扫描电镜、X射线衍射仪和X射线能谱仪对天然气井油管悬挂器腐蚀失效进行了检测分析，并对天然气井油管悬挂器用35CrMo钢进行了盐雾试验，结果表明，天然气中的水和CO2是引起腐蚀的主要介质，腐蚀产物主要是FeCO3，高速天然气冲刷和钢中的非金属夹杂加剧了腐蚀的速度. CORROSION FAILURE ANALYSIS OF AN OIL TUBE USED IN NATURAL GAS WELL LIU Shou-ping,ZHOU Shang-qi,WANG Jia-mei,REN Qin Chongqing University A failed oil tube used in natural gas well was examined by optical microscope,scanning electron microscope ,X-ray diffractometer and X-ray spectrometer.Corrosion behavior of 35CrMo steel samples of the oil tube were investigated by means of salt spray tests in the laboratory.The results show that CO2 and H2O are primary factors in the corrosion of oil tube.The corrosion product is FeCO3,non-metallic inclusions in the steel and erosion of natural gas fluid played an important role in accelerating the corrosion. oil tube; natural gas well； 35CrMo steel； failure analysis； corrosion

关键词: 悬挂器 , null , null , null

铽铝硼硅酸盐磁光玻璃形成性能及热稳定性研究

章春香 , 殷海荣 , 刘立营 , 唐保军

材料导报

采用Zhou W C提出的玻璃形成区研究方法探索了铽硼硅酸盐磁光玻璃形成区域范围,采用魔角核磁共振谱仪(MAS NMR)和示差扫描量热仪(DSC)对玻璃结构和特征温度能进行了表征,研究了Tb2O3和Al2O3对玻璃形成能力和玻璃结构的影响,同时引入玻璃析晶参数β讨论玻璃热稳定性.结果表明:Tb2O3的掺入量受玻璃形成区域的限制,在Tb2O3含量为30%(摩尔分数)时以及Al2O3含量为25%(摩尔分数)时玻璃形成能力较强;铽铝硼硅酸盐玻璃结构中硼氧多面体和铝氧多面体主要以四配位的[BO4]和[AlO4]形式存在,仍存在少量三配位的[BO3]和五配位的[AlO5];Tb2O3含量为30%(摩尔分数)的玻璃β值较大,热稳定性能较好.

关键词: 铝硼硅酸盐玻璃 , 磁光玻璃 , 玻璃成形区 , 氧化铽 , 稀土