The results indicated that there exists obvious gas gap in molten iron flowing front, and the pressure in gas gap with EPS pattern during vacuum pouring is less than1 atm.

• 试验结果表明,铸铁件流动前沿不仅存在明显的气隙,而且采用聚苯乙烯模样材料,负压下浇注时,其气隙压力低于1个大气压。