采用MMS-300热/力模拟试验机研究了无Mo和含Mo管线钢X70不同冷却条件的动态相变行为并绘制了试验钢的动态CCT曲线.结合实验室轧制和冷却试验,研究了超快冷和层流冷却条件下两种成分X70管线钢的组织演变和力学性能.结果表明:随着冷却速度的增大,无Mo管线钢X70的组织构成为多边形铁素体+珠光体、多边形铁素体+针状铁素体、针状铁素体;含Mo管线钢X70的组织构成为多边形铁素体+针状铁素体、针状铁素体;Mo抑制了多边形铁素体和珠光体相变的发生.对于无Mo管线钢X70,层流冷却工艺所得到的组织有约40％的准多边形铁素体;超快冷工艺所得到的组织为针状铁素体,有利于提高X70管线钢的强韧性.超快冷工艺使晶界取向差大于15°的有效晶粒尺寸得到了细化,无Mo管线钢X70的强韧性略高于层流冷却条件下含Mo管线钢X70.超快冷条件下含Mo管线钢X70组织更细小,力学性能可满足X80管线钢的要求.
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