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zhu tie rong ti de shuai tui ji shi mo xing tai de zhuan bian
Author(s): 
Pages: 50-59
Year: Issue:  3
Journal: Materials Science and Technology

Keyword:  石墨形态蠕虫状石墨过冷石墨生长机制片状石墨球状石墨分界线保温时间铁熔体渐变;
Abstract: 用定向凝固装置,研究铸铁熔体的衰退及石墨形态的转变。对石墨形态连续衰变过程的观察,发现了以前从未报导过的蠕虫状向过冷石墨转变的分界线。这表明石墨生长机制在分界线处发生了突变。本文认为铸铁熔体衰退过程中,石墨形态经历了如下转变:球状→蠕虫状→D 型片状→A 型片状,石墨晶体生长机制发生了渐变→突变→再渐变的过程。其中球状石墨→蠕虫状石墨的转变是渐变;蠕虫状石墨→过冷石墨的转变是突变;过冷石墨→A 型片状石墨的转变是再一次渐变。
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