材料期刊网

Mathematical Model of Dynamic Operation and Optimum Control of Billet Reheating Furnace

LIU Rixin NING Baolin ** Dept.of Metallurgy , Kunming Institute of Technology , Kunming , 650093 , China*** Dept.of Thermal Energy , Northeast University of Technology , Shenyang , 110006 , China+ To whom correspondence should be addressed

材料科学技术（英）

This paper provides a mathematical model for the billet reheating process in furnace.A new optimum method is brought up that the objective function is the integral value of enthalpy increasing process of a billet.Different delays are simulated and calculated,some proper delay strategies are ob- tained.The on-line computer control model is de- veloped.The real production conditions simulated, the temperature deviation of drop out billet from the target temperature is kept within±15℃.

关键词: reheating furnace , null , null , null , null

OXIDATION OF Ti IN MOLTEN Cu UNDER WATERY ATMOSPHERE

XUE Xiangxin DU Hegui Northeast University of Technology , Shenyang , China XUE Xiangxin Lecturer , Dept.of Ferrous Metallurgy , Northeast University of Technology , Shenyang , 110006 , China

金属学报(英文版)

An experimental study has been made of oxidation kinetics of Ti in molten Cu-Ti alloy under watery atmosphere at 1500℃.The results may be expressed as follows: [Ti]_(Cu)=0.92-0.69t O≤t≤1.0(h) [Ti]_(Cu)=0.02t~2-0.14t+0.35 1.0≤t≤6.0(h) where t is time in hour.The apparent rate and order of reaction are: (-d[Ti]_(Cu))/dt=0.69,pseudo-zeroth order,k=0.69 (-d[Ti]_(Cu))/dt=0.14-0.04t,pseudo-0.85 order,k=0.39 The apparent mass tranfer coefficient is k'=0.16 cm/h,and the relation of W~2 vs time is: W~2=1.04·10~(-4)t

关键词: Cu-Ti alloy , null , null

Sodium Activity in Molten Aluminum Measured with a Solid Electrolyte

Gang XIE Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , 200050 , ChinaShiyin SHEN Northeast University of Technology , Shenyang , 110006 , China

材料科学技术（英）

The sodium activities in aluminium in equilibrium with cryolite-alumina melt and during electrolysis were determined by EMF with Naβ-Al_2O_3 solid electrolyte.With this sodium activities,we calculate the activities of NaF and AIF_3 in the cryolite-alumina melt.The potential difference of discharge be- tween sodium ions and aluminum ions at cathode of Hall-Heroult cell was also obtained from the sodium activity in aluminum.

关键词: activity , null , null

Two-dimensional Model of the Microstructural Evolution in Hot-strip Rolling Processes of C-Mn Steels by Computer Simulations

Zhenyu LIU Wei WANG Guodong WANG Qiang ZHANG Northeast University of Technology , Shenyang , 110006 , ChinaDongqing MA Guoliang WU Jingshan LI Benxi Iron and Steel Company , Benxi , 117000 , China

材料科学技术（英）

In the present paper,the two-dimensional comprehensive model,which integrates the temperature model developed by the authors using finite difference methods and microstructural evolution model,has been developed.By using different microstructural evolution equations developed by Sellars,Senuma et al.and Easka et al.,the comparison studies have been made,which present that (1) the calculated γ-grain sizes show good agreements with the measured;(2) these equations show consistencies at the end of finishing stands.

关键词: computer simulation , null , null

Mechanical Alloying of Co and Al Powders

CHENG Lizhi ZHANG Yumei SUN Daozhi XIONG Xiangyuan HE Kaiyuan Dept.of Materials Science , Northeast University of Technology , Shenyang , 110006 , ChinaTo whom correspondence should be addressed

材料科学技术（英）

关键词: mechanical alloying , null , null

A New Contribution to the Theory of Anode Effect in Aluminium Electrolysis

QIU Zhuxian Northeast University of Technology , Shenyang , 110006 , China

材料科学技术（英）

This paper discusses the general characteristics of anode effect in aluminium electrolysis and pre- vious theories about the mechanism of anode effect. On the basis of laboratory experiments,the author suggests a new contribution to the primary and di- rect reason for anode effect.

关键词: anode effect , null , null

Characteristics of BF Burden-flow at Material Gate of Bell-less Top

D U Hegui D U Gang Northeast University of Technology , Shenyang , 110006 , China.To whom correspondence should be addressed.

材料科学技术（英）

The influence of material gate position in bur- den-flow rate has been studied by simulating exper- iments.A mathematical model describing the char- acteristics of burden-flow at the material gate of bell-less top blast furnace(BF)is established in this paper,in an attempt to solve the problems in bur- den distribution,especially to eliminate the over- lapping or disconnection of the burden at the be- ginning and at the end of a ring,which plays a quite important role in the blast furnace operation.

关键词: blast furnace , null , null , null

Disaccommodation in Fe-Ni Based Amorphous Alloys

BA Qixian HE Kaiyuan LIU Qiurong WANG Zhi Dept.of Materials Science and Technology Northeast University of Technology , Shenyang , 110006 , Liaoning , China.

材料科学技术（英）

The disaccommodation of magnetic per- meability,specific magnetization and linear magnetostriction of amorphous(Fe_xNi_(1-x))_(76)- Si_8B_(16)alloys were measured.It was found that the disaccommodation obtained at lower temperature is a monotonically decreasing function of Fe content, however,a peak is observed at higher temperature. The experimental results are discussed on the basis of magnetostrictive interaction and atomic directional ordering.

关键词: amorphous alloy , null , null

A Microcomputer Fitted Method for Determination of the True ODF of Hexagonal Materials according to the Maximum-Entropy Estimate

Liqing CHEN Fu WANG Zhide LIANG Dept.of Materials Science and Engineering , Northeast University of Technology.Shenyang , 110006 , China

材料科学技术（英）

A method which is especially suitable for microcomputer calculation of the true orientation distribution function (ODF) according to the maximum-entropy estimate is proposed for hexagonal system polycrystalline materials with physical symmetry.The resultant computational software system has been also designed and first carried out in a microcomputer PANAFACOM-U1200 being on line with the X-ray diffractometer D/max-3A.The simu- lated calculation shows that the method is concisely pragmatic and easily popularized,while the results obtained are trust worthy.

关键词: ODF , null , null

Mathematical Model for the Rotary Kiln Process and Its Application

XIAO Xingguo LI Jiaxin CAO Tongyou XIAO Zeqiang Northeast University of Technology , Shenyang , 110006 , China.

材料科学技术（英）

A mathematical model to predict the operation behaviours of the rotary kiln process and to describe the axial distribution of process variables along the length of the reactor has been developed in present work.The model is established based on the principle of mass and heat balance in the system under a steady state with the consideration of kinetic characteristics of the processes.Four examples of the simulation processes in a pi- lot kiln and 3 commercial kilns by using the present mathematical model are given in this paper.The good agreement between the predicted results and the measured data has been obtained.

关键词: rotary kiln process , null , null , null