YU Qiuping ZHOU Yaohe Northwestern Polytechnical University
,
Xi'an
,
China [Originally published in ACTA METALL SIN (CHINESEEDN) 24 (5) 1988pp B307—B312
,
received 27 December 1986
,
in revised form 7 December 1987]
金属学报(英文版)
The macrosegregation formation in an ingot and the influence of rotating mould upon it were analysed on the basis of interdendritic flow.When the ingot mould rotates unidirectionally,the centrifugal volume force acts on all inner parts,and when the ingot mould rotates alternately, the tangential alternate force is also formed,and both have various influences on the different modes of interdendritic flow.It is shown that as the ingot mould rotates unidirectionally or alternately with a moderate angular speed,the interdendritic unstable flow may be controlled effectively and the formation of segregation may be restrained.Thus,it seems to be significant for reducing the segregation such as A-type etc.,in the steel ingot.
关键词:
ingot
,
null
,
null
YU Qiuping ZHOU Yaohe Northwestern Polytechnical University
,
Xi'an
,
China
金属学报(英文版)
Equations for numerical simulation of channel segregation based on a model of continuum ap- proach to porous medium were advanced.In order to solve the non-linear computation prob- lem caused by the interactions between unknown variables in the equations,the trial-and-er- ror method is used.The computation results showed that the radial back-flow due to natural convection in mushy zone indeed exists in A1-4.5wt-%Cu alloy ingot under the condition of low cooling rate,and that the numerical simulation of channel segregation is applicable due to the coincidence of calculated concentration with the experimental values.
关键词:
channel segregation
,
null
,
null
,
null
