C.W. Ma
,
H.F. Shen
,
T.Y. Huang
,
B.C. Liu
金属学报(英文版)
A mathematical model coupling the momentum, energy and species conservation equa-
tions was proposed to calculate the macro-segregation of Fe-C alloy ingot during solidification. The corresponding simulation software which concurrently solves the macro-
scopic mass, momentum, energy and species conservation equations has been developed
by applying the SIMPLE algorithm.
The thermo-solutal convection in a NH4Cl-H2O ingot is verified and the result shows
good agreement with that reported. Then macro-segregation in a steel ingot is simu-
lated by using the developed program. The steel ingot is in a rectangular mold with a
riser. The fluid flow is mainly induced by the temperature field and the solid fraction.
The macro-segregation pattern is mainly affected by the thermo-induced convection
in the mushy zone. The negative segregation forms along the walls of the casting.
The positive segregation forms at the top center of the casting into the riser. The
species concentration reaches the peak in the center of the ingot where solidi¯cation
ends lastly.
关键词:
macro-segregation
,
null
,
null
,
null
张兴中
,
廖鹏
,
王明林
钢铁
调查了双辊薄带铸轧生产线的运行状况.整理出其工业化应用所需要的基础数据,如用于相关设计和决策的连浇时间、作业率等.给出了生产能力的算例.利用经典的传热凝同理论和经验对双辊连铸的关键参数进行界定,导出了辊缝d(铸带厚度)和辊径D、液位h和最大浇铸速度V_(cm)的关系.分析了铁辊和铜辊的差异.总结分析了双辊铸带宏观偏析有别于连铸坯的现象和机制.
关键词:
双辊连铸
,
薄带钢
,
凝固
,
宏观偏析
曹志强
,
康纪龙
,
李廷举
,
王同敏
功能材料
研究了铅黄铜在无磁场、低频交变电磁场下水平连铸得到的铸坯横截面宏观组织、微观组织形貌及合金元素Pb的分布,并对其机理进行了分析。试验结果表明,在铅黄铜水平连铸的过程中施加低频交变电磁场能有效地细化晶粒及影响合金元素在横截面上的分布,并且电磁场有效地抑制了在常规水平连铸过程中出现的铸坯横截面上中下部位组织分布不均匀的现象。表现在铸坯横截面的凝固组织由上方主要为细小柱状晶、下方为粗大柱状晶变为均为细小的等轴晶,铸锭上部凝固滞后的现象消除;合金元素Pb的宏观偏析得到抑制,并且电流为30Hz、100A的组织优于30Hz、80A的组织。
关键词:
铅黄铜
,
电磁场
,
水平连铸
,
凝固组织
,
宏观偏析
