通过对MMS200热模拟试验机进行Mn-Nb-Mo和Mn-Nb-Mo-B两种高级别管线试验钢的热膨胀试验和单道次压缩试验,测定了两种试验钢的连续冷却转变动力学曲线(CCT),并研究了硼对不同冷速下的组织转变和动态再结晶的影响.研究结果表明:硼元素的添加扩大了钢的下贝氏体转变区域,降低了贝氏体开始转变温度;Mn-Nb-Mo系试验钢在冷速＞15℃/s时,得到下贝氏体组织,而Mn-Nb-Mo-B系试验钢在冷速大于5℃/s时,就出现下贝氏体组织;微量硼的添加可显著地推迟试验钢的动态再结晶.
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