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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。
High-temperature confocal microscopy was used to observe acicular ferrite in high-strength shipbuilding steel in situ. The morphology of the acicular ferrite was observed by optical microscope. The results show that with the holding time increases, the average austenite grain size increases. The austenite size obtained when the holding time is 900 s is more conducive to the nucleation of acicular ferrite. With the extension of holding time, the temperature at which ferrite begins to change first decreases and then increases, while the temperature at the end of ferrite transformation decreases gradually.