材料期刊网

变形温度对6082铝合金析出相、显微组织演变、力学性能和腐蚀行为的影响

Nikhil KUMAR , R.JAYAGANTHAN , Heinz-GünterBROKMEIER

中国有色金属学报(英文版) doi:10.1016/S1003-6326(17)60055-4

研究深冷轧制、室温轧制和后续退火对6082铝合金析出相、显微组织演变(回复,再结晶与晶粒生长)、力学性能和腐蚀行为的影响.采用差示扫描量热仪、透射电子显微镜和背散射电子衍射研究深冷轧制、室温轧制及后续热处理样品的析出动力学和显微组织形貌,以探讨其力学性能.经200°C退火后,深冷轧制样品的抗拉强度和...

关键词: 铝合金 , 深冷轧制 , 力学性能 , 腐蚀电位 , 析出相

Systematic Study of the Simple Predictive Approaches for Thermodynamic and Transport Properties of Multicomponent Solutions

Industrial & Engineering Chemistry Research

The densities, viscosities, and conductivities were measured for the ternary solution NaCl + urea + H(2)O, the quintuple solution NaC1 Na(2)SO(4) KCl K(2)SO(4) + H(2)O, and their binary subsystems at 298.15 K. The results together with the densities, viscosities, and conductivities of multicomponent...

关键词: mixed-electrolyte-solutions;linear isopiestic relation;absolute rate;theory;aqueous-solutions;298.15 k;activity-coefficients;sodium-chloride;potassium-chloride;ternary subsystems;unified;approach

Constitutive Relationship of New Steel 33Mn2V and Its Application in Piercing Process by FEM Simulation

LU Lu , WANG Fu-zhong , WANG Zhao-xu , ZHU Guang-ya4 , ZHANG Xing-xiang5

钢铁研究学报(英文版)

Based on test data from the hot forge experiments on Gleeble 1500, a Kumar type constitutive equation for 33Mn2V steel is established. Applying this constitutive equation in commercial FEM software of MSC/SuperForm 2005, the piercing process of 33Mn2V steel in Mannesma...

关键词: 33Mn2V , constitutive equation , tube piercing process , thermo-mechanical coupling simulation , FEM analysis

对向列相液晶反转壁中＋1缺陷处挠曲电效应的理论分析

张辉 , 郑桂丽 , 田毅 , 张志东

液晶与显示 doi:10.3788/YJYXS20163108.0740

基于 Pramoda Kumar 等人文章中关于向列相液晶反转壁中＋1缺陷处挠曲电效应的实验现象，我们利用 Landau-de Gennes 理论给出相应的理论分析。当对弱锚定的平行排列向列相液晶盒施加垂直基板的直流电压，在反转壁中的±1...

关键词: 液晶 , 挠曲电效应 , +1 缺陷 , Landau-de Gennes 理论

Superior mechanical properties of Nb(2)AsC to those of other layered ternary carbides: a first-principles study

Journal of Physics-Condensed Matter

Nb(2)AsC showed superior mechanical properties to those of other layered ternary carbides (Kumar et al 2005 Appl. Phys. Lett. 86 111904). In the present density functional calculation, the underlying mechanism is interpreted by astonishing bonding features of Nb(2)AsC....

关键词: ti3sic2;solids;gpa

TC4盒形钣金零件气压成形工艺的研究

袁清华 , 张文明 , 黄重国 , 任学平

稀有金属 doi:10.3969/j.issn.0258-7076.2009.04.005

采用普通工业TC4板料,在MTS高温拉伸试验系统上进行了不同变形条件的恒速拉伸试验,研究材料的高温变形行为.分析了5类通用高温本构关系对该材料真实应力应变曲线的拟合情况.最终,采用经典的Kumar模型建立了TC4的高温本构关系.利用MAR...

关键词: TC4(Ti-6Al-4V) , 本构关系 , 气压成形 , 有限元分析

Thermodynamic Assessment and Experimental Investigation of Fe-Al-C System

Weiyan LÜ , Lin LI , Li WANG , Yanlin HE , Shuigen HUANG

材料科学技术（英文）

Phase diagram information of the Fe-C, Fe-Al and Al-C systems are reviewed and the Fe-Al-C system is assessed. A FeAlC database is created by combining a set of thermodynamic parameters established by Kumar and SSOL database in Thermo-Calc software package. Ternary pha...

关键词: Fe-Al-C , null , null

二辊斜轧穿孔过程金属变形缺陷有限元分析

刘雨龙 , 王辅忠

中国冶金

使用MSC.Superform 2005有限元仿真软件,结合无锡西姆莱斯钢管有限公司提供的曼内斯曼穿管机结构,建立基于33Mn2V钢的三维有限元仿真模型.仿真设计采用静力隐式算法,结合Kumar本构模型对实心坯二辊斜轧穿孔过程进行热力耦合...

关键词: 二辊斜轧 , 开裂 , 热力耦合 , 有限元仿真

TC11合金本构关系的建立及其在盘件等温锻造工艺设计中的应用

朱磊 , 张麦仓 , 董建新 , 庞克昌

稀有金属材料与工程

通过在Gleeble 1500上试验机的热模拟压缩实验,分析了TC11合金的高温变形特性,进而,采用非线性回归方法建立了Kumar型的TC11合金的材料本构关系,并对该本构模型在热加工参数范围的延拓性进行了分析.结果表明,该模型具有较高的...

关键词: TC11合金 , 本构关系 , 等温锻造 , 模拟式工艺设计