Abstract: Under the effect of electromagnetic field with low frequency,the evolutions of solidified shell height and surface aspects,bearing on 7075-aluminum alloy produced by CREM process,have been investigated. The results show that t he gradual enhancement of the electromagnetic intensity allows a decrease in the height of solidified shell and in the contact height between melt and mold,which improve surface aspects of the ingot. Crystal-dissociating theory are used to explain the formation mechanism of initial solidified shell under the effect of electromagnetic field. It is pointed out that under the effects of electromagnetic field, the decrease of crystal particles dissociated from the crystallizer wall results in the difficulty of formation of solidified shell,which is the key reason that delay the time an ddecrease the position of forming the initial solidified shell.
Relationship between electromagnetic intensity and initial solidified shell height of aluminum alloy produced by CREM process
Abstract:
Under the effect of electromagnetic field with low frequency, the evolutions of solidified shell height and surface aspects, bearing on 7075 aluminum alloy produced by CREM process, have been investigated. The results show that the gradual enhancement of the electromagnetic intensity allows a decrease in the height of solidified shell and in the contact height between melt and mold, which improve surface aspects of the ingot. Crystal dissociating theory are used to explain the formation mechanism of initial solidified shell under the effect of electromagnetic field. It is pointed out that under the effects of electromagnetic field, the decrease of crystal particles dissociated from the crystallizer wall results in the difficulty of formation of solidified shell, which is the key reason that delay the time and decrease the position of forming the initial solidified shell.