C.L.LIU
,
H.AZIZI-ALIZAMINI
,
N.C.PARSON
,
W.J.POOLE
,
Q.DU
中国有色金属学报(英文版)
doi:10.1016/S1003-6326(17)60085-2
通过数值模拟和实验相结合的方法,对Al-Mg?Si?Mn?Fe(AA6xxx)系合金均匀化过程中的显微组织演化进行研究.所应用的数学模型是结合CALPHAD及基于AA3xxx(Al?Mn?Fe?Si)系合金均匀化热处理而开发的.而后对此模型进行修正,以使得其应用拓展到更为复杂的AA6xxx系合金.该热处理模型可以预测包括溶质元素分布、初生相类型与比例、以及弥散相密度和尺寸分布在内的关键显微组织的演化.实验方面,对3种不同锰含量的AA6xxx系合金进行均匀化热处理.应用扫描电子显微镜、EPMA、XRD和电阻率等实验手段对所得均匀化组织进行多角度表征.预测结果与实验表征的对比表明,数学模型可以较为准确地反映均匀化过程中显微组织的演化.
关键词:
AA6xxx合金
,
均匀化热处理
,
数学模型
,
CALPHAD
,
扩散
XIAO Xingguo LI Jiaxin CAO Tongyou XIAO Zeqiang Northeast University of Technology
,
Shenyang
,
110006
,
China.
材料科学技术（英文）
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
QU Ying YANG Jian XU Baomei University of Science and Technology Beijing
,
Beijing
,
China
金属学报(英文版)
By use of the two-component LDA and high speed camera,the water model of the flow field in metal bath under molten slag layer has been tested.On the basis of experimental results,the flow boundary conditions of liquid metal at the slag-metal interface of a gas injecting bath were deduced.The flow field and the turbulent parameters of the metal bath covered with slag were solved by the vorticity-stream function method.The results reveal that the flow velocity, turbulent energy and circulating rate of the melt under slag are lower than that of without slagcover.Another one “dead zone” of the lowest turbulent energy is formed in the top layer under cover of slag near the ladle linning.
关键词:
flow field
,
null
,
null
,
null
