Semi-solid processing of hypereutectic A390 alloys using novel rheoforming process
The feasibility of semi solid processing of hypereutectic A390 alloys using a novel rheoforming process was investigated.A combination of the swirl enthalpy equilibration device (SEED) process,isothermal holding using insulation and addition of solid alloy during swirling was introduced as a novel method to improve the processability of semi solid slurry.The effects of isothermal holding and the addition of solid alloy on the temperature gradient between the centre and the wall and on the formation of α(Al) particles were examined.In additional tests,phosphorus and strontium were added to the molten metal to refine the primary and eutectic silicon structure to facilitate semi solid processing.The results show that the combination of the SEED process with two additional processing steps can produce semi-solid A390 alloys that can be rheoprocessed.The microstructure reveals an adequate amount of non-dendritic α(Al) globules surrounded by liquid,which greatly improves the processability of semi-solid slurry.
semi-solid forming rheoforming process hypereutectic A390 alloys microstructure
M.TEBIB J.B.MORIN F.AJERSCH X.GRANT CHEN
Université du Québec à Chicoutimi, Chicoutimi, QC, G7H 2B1, Canada (E)cole polytechnique de Montréal, Montréal, QC, H3C 3A7, Canada
国际会议
北京
英文
1743-1748
2010-09-16（万方平台首次上网日期，不代表论文的发表时间）