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利用金相显微镜、扫描电镜、透射电镜等研究了2种成分的X100管线钢的力学性能、显微组织、晶粒取向及析出物。试验结果表明,采用高铌+钼组合不含硼的X100管线钢更易在高强度和良好低温韧性之间获得平衡,通过控轧控冷工艺研发出的X100管线钢具有粒状贝氏体、针状铁素体和少量下贝氏体的最优化组织,铁素体晶粒尺寸约3μm,钢中大量弥散的纳米级析出物和高密度位错也起到了良好的强化作用。
The mechanical properties, microstructure, grain orientation and precipitates of X100 pipeline steel with two components were studied by means of metallographic microscope, scanning electron microscope and transmission electron microscope. The test results show that X100 pipeline steel with high niobium + molybdenum without boron is easier to strike a balance between high strength and good low temperature toughness. X100 pipeline steel developed by controlled rolling and controlled cooling process has granular bainite, acicular Ferrite and a small amount of lower bainite optimized organization, the ferrite grain size of about 3μm, a large number of dispersed nano-precipitates in steel and high density dislocation also played a good role in strengthening.