对工业实验生产的X90级第三代管线钢的力学性能与组织特征进行了研究.结果表明,工业试生产的18.4 mm厚X90管线钢板微观组织是以准多边形铁素体、板条贝氏体及其中的M/A(马氏体/奥氏体)为主的多相组织.钢板的屈服强度达到615-660 MPa,抗拉强度达到720 MPa以上,屈强比不大于0.9,-30℃冲击功达到200 J,-15℃落锤撕裂实验(DWTT)韧性剪切面积大于80％.实验钢中“软相”(准多边形铁素体)与“硬相”(板条贝氏体)的比例约为3:2,板条贝氏体组织位错密度高,而准多边形铁索体的位错密度较低.EBSD结果表明,工业实验钢“硬相”组织中的板条之间呈现切变转变特征,已达到软硬相多相组织的调控效果.
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