采用高温共聚焦激光显微镜(CSLM)对含Ti复合夹杂物诱导晶内针状铁素体(IAF)进行动态原位观察,并用OM,FE-SEM,EDS和EPMA研究奥氏体晶粒尺寸和冷却速率对含Ti复合夹杂物诱导生成IAF的影响.结果表明,IAF的开始生成温度随奥氏体晶粒尺寸的增加,先升高后降低;生成IAF体积分数随冷却速率的提高显著增加,归功于IAF开始生成温度的提高.贫Mn区的形成是含Ti复合夹杂物(Ti-Mn-O)+ (Si-Al-Mn-O) +MnS诱导生成IAF的主要驱动力.此外,在该实验条件下得出,当奥氏体晶粒尺寸在132-255 μm时,IAF开始生成的温度范围为550-633℃;奥氏体晶粒尺寸为176 μm,冷却速率为5℃/s时,室温组织中IAF体积分数高达90%.
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