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本文在大量实验的基础上,分析用铈、镧处理工业铁水得到的各种石墨形态,初步查明了铈、镧对石墨的球化能力和孕育硅对石墨的球化作用。实验指出:工业铁水中加入球化元素是形成球状石墨的必要条件,而充分条件是加入球化剂和孕育剂,孕育硅有促进石墨球化的能力。 文中提出:石墨微晶(0001)面螺旋生长和(1012)或(1013)面事晶分枝是球状石墨的生长模式。初生球状石墨的变异是孪晶分枝发展的结果,共晶结晶时,球状石墨的变异与石墨结晶的前沿条件有关。
In this paper, based on a large number of experiments, the various forms of graphite obtained from the treatment of industrial hot metal with cerium and lanthanum were analyzed. The nodularity of cerium and lanthanum on graphite and the spheroidization of silicon on graphite were preliminarily identified. The experiment shows that adding spherulitic elements into industrial hot metal is a necessary condition for the formation of spherical graphite, while sufficient conditions are adding nodulizer and inoculant, which can promote the ability of graphite spheroidization. It is proposed that the (0001) plane spiral growth of graphite crystallites and the (1012) or (1013) plane crystallographic branching are the growth modes of spheroidal graphite. The variation of nascent spherical graphite is the result of the development of twins. In eutectic crystallization, the variation of spherical graphite is related to the frontier conditions of graphite crystallization.