中文摘要：

采用热模拟方法,通过不同配分温度的HOP（Heating on-line partitioning）处理,使X80管线钢获得（B＋M/A）复相组织和优良的变形能力。采用力学性能测试、材料显微分析和X射线衍射方法研究了在不同配分温度下（B＋M/A）X80管线钢的组织演变规律,分析了显微组织对其力学性能的影响。研究结果表明,随着配分温度的升高,由于贝氏体板条宽化、位错密度降低、残余奥氏体含量增加和碳化物的粗化,导致实验钢的强度降低和塑性增加。当配分温度较高时,残余奥氏体稳定性和含量的降低是材料强度增加、塑性降低的显微组织因素。

英文摘要：

（B＋M/A）X80 pipeline steel with the excellent deformability can be obtained by the HOP （Heating on-line partitioning） technology. The effects of partitioning temperature on microstructure and mechanical properties of the experimental steel were researched by means of mechanical property test, microscopic analysis and X-ray diffraction. The results show that as the partitioning temperature increasing, the strength of the experimental steel decreases and the plasticity increases because of the increase of bainite lath width, the decrease of dislocation density, the increase of retained austenite content and carbides coarsening. When the partitioning temperature is high, the decrease of the volume content and stability of retained austenite is the key factor influencing the increase of strength and the decrease of plasticity.