采用热模拟、力学性能测试和材料显微分析等试验技术,对X80管线钢在临界区加速冷却工艺下的组织性能变化规律进行了研究.结果表明,通过临界区加速冷却,X80管线钢可获得贝氏体+铁素体(B+F)双相组织.随着始冷温度的上升,试验钢的贝氏体含量增加,铁索体含量降低,导致屈服强度增高,塑性降低.当始冷温度为840℃时,显微组织以细小、多位向分布的贝氏体为主,辅以高密度位错的多边形铁素体.这种(B+F)双相组织使得试验钢的屈强比为0.80、均匀伸长率为10.0％、形变强化指数为0.12,满足了大变形管线钢的技术要求.
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