采用扫描电镜、电子背散射衍射技术和常规力学性能测试等手段研究了两种X70管线钢的显微组织和力学性能.结果表明:管线钢的低温韧性不仅与其有效晶粒尺寸有关,而且还与其组织中的马奥岛和析出相有关;但是,与管线钢中大角度晶界所占的百分比没有直接的关系.有效晶粒尺寸越小,马奥岛和富钛氮化物数量越少、尺寸越小,管线钢的低温韧性就越好.富铌碳化物与高密度的位错和亚结构不仅能提高管线钢的屈服强度,而且还能增大其加工硬化速率,从而使其抗拉强度明显升高,屈强比减小.由此可见,通过显微组织的优化,可以得到高强度高韧性的管线钢.
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