采用G1eeble-3500热模拟试验机进行了X100管线钢两阶段控制轧制及轧后控冷工艺模拟,研究冷速、精轧变形量及等温温度对亚稳态奥氏体相变规律影响.结果表明:实验钢在试验冷速范围内组织由块状铁素体、粒状贝氏体和板条贝氏体构成;随着冷速增加,奥氏体转变百分率曲线左移,最快相变温度下降,转变速率增加;随着精轧变形量增大,Ar3显著提高,奥氏体转变百分率曲线右移,转变速率变化较小.X100管线钢等温温度在400 ～ 450℃范围内组织以粒状贝氏体为主,降低至350℃时组织以板条贝氏体为主.
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