摘要
用不同的饱和度和碳当量的铁液浇注不同厚度的高镍奥氏体球墨铸铁试块,从金相组织、力学性能上对高镍奥氏体球墨铸铁的饱和度和碳当量进行了验证。试验表明,饱和度A超过4.9时,在不同的厚度上仍能得到球化率和力学性能合格的铸件。当碳当量取较高值时,降低了铁液的液相线温度,熔炼温度随之下降,反过来又减少了高温熔炼带来的不利影响。在不产生冷隔的前提下,为降低浇注温度创造了条件。较高的碳当量有利于凝固过程的石墨化膨胀所产生的自补缩效果,可以减少缩松和缩孔缺陷。
Austenite nodular cast iron test block with different thickness were cast from different saturation and CE, and the saturation and CE were verified by microstructure and mechanical properties. It proved that qualified castings with different thickness in nodularity and mechanical properties are still obtained when the saturation （A） value exceeds 4.9. Adopting high value of CE can low the liquidus temperature of molten iron, which makes the melting temperature decrease, and it conversely reduces detrimental affect for high temperature melting. Under the precondition that no cold shut occurs, it creates conditions to decrease pouring temperature. Higher CE is helpful to improve the self-feeding ability of graphitizing expansion during solidification process, and to reduce casting defects, such as shrinkage and blowhole.
出处
《铸造技术》
CAS
北大核心
2009年第9期1097-1101,共5页
Foundry Technology
关键词
饱和度
球化率
力学性能
缩松和缩孔
Saturation
Nodularity
Mechanical property
Shrinkage and blowhole
