通过热处理试验和组织观察,研究了在1123 ～1523 K内加热温度和时间对含Nb高碳钢奥氏体晶粒尺寸变化的影响,分析了奥氏体化过程Nb的析出状态,并推导了含Nb高碳钢等温加热过程的奥氏体晶粒长大模型.结果表明:随着加热时间的延长,在低温区(1123 ～ 1423 K)加热时,晶粒长大速率较慢;在高温区(1423～1523 K)加热时,晶粒发生快速长大.所建立的模型适合奥氏体化过程晶粒尺寸演变的计算.
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