流变铸造半固态亚共晶高铬铸铁组织形成研究  

A Study on Structure Formation of Rheologicaly Cast Semi-Solid Hypoeutectic Hi-Cr Cast Iron

作　　者：蒋业华[1] 戴长泉[1] 周荣[1] 

机构地区：[1]昆明理工大学,云南昆明650093

出　　处：《现代铸铁》2005年第2期11-13,共3页Modern Cast Iron

摘　　要：研究了亚共晶高铬铸铁半固态球状晶的形成条件及规律。结果表明:通过控制合适的浇注温度,并对充型前的金属液进行激冷处理,同时对过冷的金属液配以适当的振动,可以获得球形或近球形的先共晶奥氏体非枝晶组织;在带有倾斜板冷却体的低温浇注情况下,金属液的冲刷、流动及振动使熔体获得了均匀的溶质场和温度场,抑制了发达的先共晶奥氏体枝晶的形成,为球状晶的获得提供了条件。The formation condition and regulation of the semi-solid spheroidal crystal of hypoeutectic hi-Cr cast iron was investigated. The result showed that, by adopting proper pouring temperature, chilling the molten metal before mould filling, and properly vibrating the supercooled molten metal, it is possible to obtain spheroidal or quasi-spheroidal non-dendrite structure of proeutectic austenite; and, under the condition of low temperature pouring with a slope plate cooler, the molten metal washing, flowing and vibrating enabled the melt to obtain an even solute field and temperature field that restrained formation of the developed proeutectic austenite dendrite and made it possible to obtain spheroidal crystal.

关 键 词：半固态形成 高铬铸铁 非枝晶组织 倾斜板冷却体 

分 类 号：TG143[一般工业技术—材料科学与工程] TG249.9[金属学及工艺—金属材料]