Instability of the delta-ferrite/austenite interface in low carbon steels: The influence of delta-ferrite recovery sub-structures
Instability of the delta-ferrite/austenite interface in low carbon steels: The influence of delta-ferrite recovery sub-structures
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DOI：
10.2355/isijinternational.44.414
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发表时间：
2004-02
影响因子：
1.8
通讯作者：
D. Phelan;R. Dippenaar
中科院分区：
文献类型：
--
作者：
D. Phelan;R. Dippenaar
利用激光扫描共聚焦显微镜对低碳钢中δ -铁素体/奥氏体相变的原位研究发现，δ -铁素体相中恢复亚结构的存在对δ -铁素体/奥氏体界面的明显不稳定性起着积极的作用。为了量化子边界对Fe-C和Fe-C- mn合金中δ -铁素体向奥氏体转变速率的影响，进行了相场模拟，证实了原位观察到的奥氏体优先沿着δ -铁素体子边界生长。模型研究还预测，如果δ -铁素体晶粒中存在亚边界网络，则δ -铁素体向奥氏体的转变动力学将增强。
An in-situ study of the delta-ferrite/austenite phase transformation in low carbon steels utilising laser scanning confocal microscopy has found that the presence of a recovery sub-structure in the delta-ferrite phase plays an active role in the apparent instability of delta-ferrite/austenite interfaces. Phase field modelling conducted in an attempt to quantify the influence of sub-boundaries on the transformation rate of delta-ferrite to austenite in Fe-C and Fe-C-Mn alloys, confirmed the in-situ observations that austenite grows preferentially along delta-ferrite sub-boundaries. The modelling studies also predicted that the transformation kinetics of the delta-ferrite to austenite would be enhanced if a sub-boundary network were present in the delta-ferrite grains.