在DIL805A/D相变仪上对试样进行热处理并测出相变点,应用余氏理论(EET)计算出相结构因子,并采用光学显微镜(OM)、透射电镜(TEM)及AMI-21型奥氏体测量仪对微观组织、亚结构及残留奥氏体量进行了观察与测量.分析了空冷条件下稀土对GDL-1钢连续转变的影响.结果表明:添加一定量稀土后,有τ/t ＜1,形成的核胚不会被侧向迁移的台阶吞并,可以激发形核长大,形成贝氏体多层次精细亚结构.稀土的添加使GDL-1钢中Fe-C-RE的偏聚单元增大(相结构因子nA和FCD值同时增大),造成Fe-C-RE偏聚结构单元对相变的阻力增加,抑制粒状贝氏体形成同时细化贝氏体铁素体组织及亚结构.稀土增加残留奥氏体量,且提高其稳定性.
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