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通过卷取连续HOP(heating on-line partitioning)技术,使X80管线钢获取了(B+M/A)复相组织和大变形性能。采用力学性能测试、显微分析和X射线衍射方法研究了在不同卷取温度条件下(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。结果表明,随着卷取温度的升高,贝氏体的含量和位错密度减小,残余奥氏体含量增加,导致材料强度降低和塑性增加。在高的卷取温度条件下,碳化物的析出和残余奥氏体的分解是材料强度增加和塑性减小的显微组织因素。在一定卷取温度下,实验钢有低的屈强比、高的均匀伸长率和和高的形变强化指数,符合大变形管线钢的技术要求。
Through the continuous heating HOP (heating on-line partitioning) technology, the (B + M / A) complex phase structure and large deformation performance of X80 pipeline steel were obtained. The microstructure and microstructure evolution of X80 pipeline steel with (B + M / A) X80 under different coiling temperatures were investigated by mechanical testing, microscopic analysis and X-ray diffraction. The effect of microstructure on the mechanical properties was analyzed. The results show that with the increase of coiling temperature, the content of bainite and dislocation density decrease and the content of retained austenite increases, which leads to the decrease of strength and plasticity. At high coiling temperatures, the precipitation of carbides and the decomposition of retained austenite are microstructural factors that increase the strength of the material and reduce the plasticity. Under a certain coiling temperature, the experimental steel has low yield ratio, high uniform elongation and high deformation strengthening index, in line with the technical requirements of large deformation of pipeline steel.