研究了X120管线钢模拟控扎后冷却速度对组织性能的影响。扫描（SEM）和电子背散射衍射（EBSD）观察结果表明,提高控轧后冷速可以得到有效晶粒尺寸细小的板条贝氏体,有利于提高大角度晶界百分比,并结合力学性能测试结果,得出细小的板条贝氏体和大角度晶界有利于提高管线钢强度。利用透射电镜和能谱分析研究了实验钢中Nb、Ti等微合金元素的析出规律,冷速越大析出相粒子越细小弥散,沉淀析出强化效果越好。细晶强化、晶界强化和析出相强化等都是管线钢强化的主要方式。
Effect of cooling rate on microstructure and mechanical properties of X120 pipeline steel after rolling was investigated by simulation on a Gleeble-3500 simulator,SEM,EBSD,TEM and tensile tests.The results show that with the increasing cooling rate,bainite lath is refined and volume fraction of high-angle grain boundary increases,and thus strength of the pipeline steel increases.The precipitation behavior of microalloy（Nb,Ti） carbonitrides was examined by transmission electron microscopy and EDS analysis.The results show that with increasing the cooling rate,MC particles become more finer and dispersively distribution,and the precipitation strengthening effect is better.The strengthening mechanism of X120 pipeline steel by accelerating cooling after rolling is the combination of the fine grain strengthening,grain boundary strengthening and precipitation strengthening.
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