本文研究了具有铁素体加珠光体原始组织的低碳低合金钢在临界区(740℃到820℃)奥氏体化过程的动力学.奥氏体的形成可分成两个阶段:1.奥氏体的形核和快速长大;2.奥氏体缓慢地向铁素体中推移.在740℃,奥氏体主要在珠光体和铁素体界面上形核,而在780℃和820℃,部分奥氏体核在珠光体团内的渗碳体和铁素体界面上生成.阶段Ⅰ的测量结果符合Cahm的晶界形核转变理论;对阶段Ⅱ用再结晶晶粒长大理论进行了讨论.
The kinetics of austenitization during intercritical annealing at temperaturesbetween 740 and 820℃ has been studied on the low carbon low alloy steels witha prior microstructure of ferrite-pearlite.In austenitization process,two stages,namely,nucleation and rapid growth of austenite,and slow growth of austeniteinto ferrite are presented.The austenite nucleates mainly along the ferrite-pearliteinterfaces at 740℃,but part of the austenite nuclei forms along the ferrite-ce-mentite boundaries in pearlite colony at 780 and 820℃.The kinetics of the formerstage examined obeys the Cahn's theory of grain boundary nucleation transforma-tion.An attempt is made to discuss the kinetics of the later stage by the theoryof grain growth on recrystallization.
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