利用SEM和TEM原位拉伸方法研究了轧后冷却制度对X80级抗大变形管线钢组织的影响及低屈强比的微观机理.结果表明:采用轧后弛豫+控制冷却的工艺可以获得铁索体+贝氏体双相组织,弛豫终止温度是影响铁素体体积含量和晶粒大小的决定因素.当弛豫终止温度区间为690-705℃时,试样的强度和塑性达到了较好的匹配,满足X80级抗大变形管线钢的性能要求.弛豫终止温度越低,铁素体体积含量越高,晶粒尺寸越大,屈强比越低.对拉伸过程进行动态原位观察的结果表明,铁索体(软相)和贝氏体(硬相)的协调变形机制是屈强比降低的原因.
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