摘要
采用定向凝固方法,并借助金相显微镜和扫描电镜等手段,研究了铈含量的变化对铸铁中各形态石墨间相互转变的影响。发现:在控制界面推进速度不变的条件下,随铈含量的增加,可从片状石墨依次向过冷石墨、蠕墨、枝晶间石墨、球缺状石墨连续转变,这种转变是逐渐进行的。与文献[1]的结论相结合,可以得出:球墨、蠕墨、片墨之间的转变是可逆的。此外,还发现在铈含量高的情况下,石墨与奥氏体仍可进行密合共晶生长。
The influences of content of cerium on the transition of various forms of graphites in casting iron is studied by means of undirectional solidification, optical microscope and scanning electron microscope. The conclusions are that, as the content of cerium is increased gradually, the flake graphite can transformed successively to supercooled graphite, vermicular graphite, intcrdendrile vermicular graphite and sector-like graphite under a constant moving speed of interface between solid and liquid. According to the results of referencc[1] the conclusion is drawn that the morphology transition between nodular graphite, vermicular graphite and flake graphite is reversible. Besides, the coupling eulcctic growth between graphite and austcnilc is observed even in a liquid of high content of cerium.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1989年第2期124-129,共6页
Journal of University of Science and Technology Beijing
关键词
铸铁
石墨
定向凝固
unidirectional solidification, cast iron, graphite
