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借助SEM和电子背散射衍射(EBSD)技术对一种低合金含量的X90高强度管线钢进行了显微组织分析,探讨了其显微组织与力学性能关系。结果表明:X90管线钢的显微组织为铁素体(F)+粒状贝氏体(GB),组织中较高的F含量会降低钢板强度;大角度晶界比率较高及有效晶粒尺寸较小时,钢板会获得较好的冲击性能;较高的全厚度方向组织均匀性和细小的铁素体晶粒尺寸会提高低温区间管线钢的落锤撕裂剪切面积,保证其良好的落锤性能。
By means of SEM and electron backscatter diffraction (EBSD), the microstructure of X90 high strength steel with low alloy content was analyzed and the relationship between the microstructure and mechanical properties was discussed. The results show that the microstructure of X90 pipeline steel is ferrite (F) + granular bainite (GB). The higher content of F in the microstructure reduces the strength of the steel plate. The higher ratio of high angle grain boundaries and the effective grain size The smaller the steel plate, the better the impact properties will be obtained. The higher uniformity in the whole thickness direction and the smaller ferrite grain size will increase the drop weight tear shear area of the pipeline steel in the low temperature range and ensure a good drop Hammer performance.