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Fe-2.3Si-3.7C合金中渗碳体的石墨化
引用本文:刘宗昌,郝少祥,王振国.Fe-2.3Si-3.7C合金中渗碳体的石墨化[J].包头钢铁学院学报,2004,23(2):129-133.
作者姓名:刘宗昌  郝少祥  王振国
作者单位:[1]内蒙古科技大学材料科学与工程学院,内蒙古包头014010 [2]郑州经济管理干部学院机电系,河南郑州450000
摘    要:为了探索白口铁的石墨化机理,研究了Fe-2.3Si-3.7C合金中石墨化形核及长大过程.通过电子显微分析、光学金相分析发现,石墨可以在奥氏体中、渗碳体中、渗碳体/奥氏体的相界面上形核,但在奥氏体中的形核几率最大.石墨化形核速度很快,硅在渗碳体的石墨化过程中起到异乎寻常的促进作用.渗碳体的石墨化是通过渗碳体溶解、熔断,碳原子长程扩散,石墨形核并且不断长大的过程.

关 键 词:铸铁  石墨化  形核  合金  渗碳体  石墨化过程  graphitization  Cementite  扩散  子长  熔断  溶解  作用  形核速度  形核几率  相界面  奥氏体  发现  金相分析  光学  显微分析  电子  长大过程
文章编号:1004-9762(2004)02-0129-05
修稿时间:2004年3月11日

Cementite graphitization in Fe-2.3 Si-3.7C alloy
LIU Zong-chang,HAO Shao-xiang,WANG Zhen-guo.Cementite graphitization in Fe-2.3 Si-3.7C alloy[J].Journal of Baotou University of Iron and Steel Technology,2004,23(2):129-133.
Authors:LIU Zong-chang  HAO Shao-xiang  WANG Zhen-guo
Affiliation:LIU Zong-chang~1,HAO Shao-xiang~2,WANG Zhen-guo~1
Abstract:In order to make out the graphitization mechanism of white iron, nucleation and growth in Fe-2.3Si-3.7C alloy were investigated by means of optical and electronic microanalysis technology. The result shows that graphite can nucleate in cementite, austenite and interface of them, but it is most possible to nucleate in austenite. The rate of graphitization nucleation is very rapid and the addition of silicon accelerates graphitization greatly. Cementite graphitization is a process which consists of cementite dissolving and rupturing, carbon long-order diffusing, graphite nucleating and growing.
Keywords:cast iron  graphitization  nucleation
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