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利用热模拟、扫描电镜、透射电镜等分析手段研究了控轧工艺和冷却制度等对X100管线钢微观组织和显微硬度的影响。结果表明:在820℃变形时,随变形量增加,试验钢中板条贝氏体比例减少,粒状贝氏体比例增加,组织逐渐细化,显微硬度明显下降;400℃终冷时,随冷却速度的增加,粒状贝氏体组织逐渐细化,马奥岛数量减少,颗粒尺寸减小,显微硬度增加;在600～350℃范围终冷时,随终冷温度降低,贝氏体组织细化,马奥岛体积分数减少,颗粒尺寸减小,终冷温度降低到300℃时,组织中出现了大量硬相的板条贝氏体组织;显微硬度随着终冷温度的降低而增加。
The effects of rolling process and cooling system on microstructure and microhardness of X100 pipeline steel were studied by means of thermal simulation, scanning electron microscopy and transmission electron microscopy. The results show that with the increase of deformation at 820 ℃, the proportion of bainite in the test steel decreases, the proportion of granular bainite increases, and the microstructure becomes thinner and the microhardness decreases obviously. When the temperature is 400 ℃, With the increase of cooling rate, granular bainite structure gradually refined, the number of island of Ma’ao decreased, the particle size decreased and the microhardness increased. When the temperature ranged from 600 ℃ to 350 ℃, When the final cooling temperature was reduced to 300 ℃, a large amount of hard phase lath bainite appeared in the microstructure. With the decrease of the final cooling temperature increase.