对比研究了3组X80抗大变形管线钢的拉伸性能和显微组织,讨论微观组织尤其是第二相组态对力学性能的影响.结果表明,3组X80抗大变形管线钢的拉伸应力-应变曲线均呈圆屋顶型的连续屈服态,且纵向屈强比均小于0.85;硬相M/A组元对X80钢产生明显的第二相强化作用,随着M/A相含量的增加,材料屈服强度增大,屈强比主要受控于软硬结合的AF+M/A组元双相组织,硬相M/A组元的体积含量与屈强比表现出非线性关系.
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