高强度船板钢中针状铁素体的原位观察

In-situ Observation of Acicular Ferrite in High Strength Ship-building Plate Steel

采用高温共聚焦显微镜对高强度船板钢中针状铁素体进行原位观察,并利用金相显微镜分析原位观察后其组织形态。结果表明,随着保温时间的增加,平均奥氏体晶粒尺寸增大。保温时间为900 s时获得的奥氏体尺寸更有利于针状铁素体的形核。随着保温时间的延长,铁素体开始相变的温度先减小后增加,而铁素体的相变结束温度逐渐减小。

The acicular ferrite in high strength ship plate steel was observed by confocal scanning laser microscope （ CSLM）, and morphology in steel of in situ observation was investigated by using optical microscopy. The results show that holding time of 900 s is in favor of acicular ferrite nucleation. The austenite grain size increases with increasing holding time. The austenite size that is acquired at 900 s of the holding time is more conducive to the nucleation of acicular ferrite. The starting formation temperature of ferrite firstly decreases with increasing holding time, then.increases. The ending formation temperature of ferrite decreases with increasing holding time.