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利用环境扫描电子显微镜对X80管线钢(/%:0.043C、0.25Si、1.86Mn、0.085Nb、0.001 Ti、0.028Al、0.002 7N)的显微组织进行了观察,并借助于X射线衍射仪和电子背散射衍射技术,分析了管线钢组织与晶粒织构取向的特点。结果表明,{112}〈110〉、{110}〈110〉取向增加、小角度晶界比率提高,使管线钢的落锤撕裂面积增大,韧性提高;降低终轧温度、提高冷却速度,能够得到较多的针状铁素体,对落锤撕裂性能是有利的。
The microstructures of X80 pipeline steel (/%: 0.043C, 0.25Si, 1.86Mn, 0.085Nb, 0.001 Ti, 0.028 Al, 0.002 7N) were observed with an environmental scanning electron microscope and analyzed by X-ray diffraction Electron backscatter diffraction technology, analysis of the characteristics of the pipeline steel structure and grain texture orientation. The results show that the orientation of {112} <110> and {110} <110> increases and the ratio of small angle grain boundaries increases, which leads to the drop weight tear area of pipeline steel increases and the toughness increases. The finish rolling temperature is decreased, the cooling rate is increased, Able to get more acicular ferrite, the drop hammer tear performance is beneficial.