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利用在线加热配分(HOP)技术,可使X100钢获得(B+M/A)复相组织和大变形性能。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(B+M/A)X100管线钢在不同HOP终冷温度条件下的组织与性能特征。结果表明,随着终冷温度的升高,试验钢贝氏体的板条宽度增加,贝氏体的含量和位错密度减小,导致材料强度降低和塑性增加。在高的终冷温度条件下,马氏体的形成、碳化物的析出和残留奥氏体的分解导致材料强度增加和塑性降低。但是,在本试验所采用的不同终冷温度下,试验钢的屈强比均不高于0.80,均匀伸长率均不低于8%,形变强化指数大于0.10,符合大变形管线钢的技术要求。
The X100 steel can be obtained as (B + M / A) multiphase microstructure and large deformation performance by using online heating fractionation (HOP) technology. The microstructure and mechanical properties of (B + M / A) X100 pipeline steel under different HOP final cooling temperatures were investigated by mechanical properties testing, material microstructure analysis and X-ray diffraction. The results show that with the increase of the final cooling temperature, the width of bainite in test steel increases, the content of bainite and the density of dislocation decrease, which leads to the decrease of strength and plasticity. At high final cooling temperatures, the formation of martensite, the precipitation of carbides, and the decomposition of retained austenite lead to an increase in material strength and a decrease in ductility. However, under the different final cooling temperatures used in this test, the yield strength ratio of the test steel is not higher than 0.80, the average elongation is not less than 8% and the strain enhancement index is greater than 0.10, which is in line with the technology of large deformation pipeline steel Claim.