增碳铸铁熔液的特性与凝固行为

Solidification Behaviores and Properties of Carburizing Cast Iron Melt

在高频电炉中用石墨坩埚熔化铸铁试样,在1773K的温度下,分别用晶体与非晶体的增碳剂进行处理,通过激冷的楔形试块、阶梯试块以及试样重熔冷却凝固热分析和组织观察,研究了增碳熔液的特性与凝固行为。结果表明:用电极石墨的晶体增碳剂进行增碳时,在2.1%C的铸铁熔液中,石墨的溶解较容易,同时也促进其按Fe-C稳定系进行共晶凝固。这一结果说明,增碳铸铁的特性和凝固行为,依存于增碳剂的结构特性。

A carburized cast iron melt was prepared using crystalline and amorphous carburizers in a high-frequency induction furnace at 1 723 K, and the properties and solidification behavior of the carburized cast iron melt were studied through chill and stepped bar tests using cast samples. The re-melted samples were also examined through thermal analysis and microstructural observation. Carburization with crystalline electrode graphite facilitates the melting of graphite in the Fe-2.1% C alloy melt, and also promotes the nucleation and growth of stable eutectic graphite-γ. These result indicated clearly that the solidification behavior and the various carburizers.