通过将钛微合金化钢在箱式电炉中加热至850～1250℃保温30 min,观察其奥氏体晶粒组织及Ti的析出粒子分布情况,研究钛微合金化钢奥氏体晶粒长大行为及Ti的固溶规律.结果表明:随着加热温度的升高,试验钢存在两个奥氏体晶粒粗化温度,分别为1050℃和1250℃,与Ti两种析出粒子的固溶温度相对应,但数值比固溶温度低.分析奥氏体晶粒两个阶段的长大过程发现,随着TiC析出粒子的溶解,晶粒长大激活能从265.6 kJ/mol降低至239.8 kJ/mol.
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