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通过热模拟试验,借助于SEM、TEM和其它显微组织分析手段,研究了高钢级管线钢生产过程中主要控轧控冷参数对显微组织中M/A组元体积分数、颗粒尺寸和形态分布的影响。结果表明:提高终轧温度,试验钢显微组织粗化,M/A组元体积分数增加,颗粒尺寸增大,不规则形状的M/A数量增多;随着冷却速度增加,M/A组元体积分数降低,颗粒尺寸减小;在300~450℃内终冷时,M/A组元的体积分数和颗粒尺寸均在360℃附近出现了最小值,升高或降低终冷温度都将使M/A组元的数量和尺寸增多和增大。因此,在高钢级管线钢生产中,适当降低终轧温度、增加冷却速度、选取合理的终冷温度,是有效控制显微组织中M/A组元的形态分布、确保优异韧性的关键。
By means of thermal simulation test, SEM, TEM and other microstructure analysis methods were used to study the effects of main controlled cooling and controlled cooling parameters on the microstructure of M / A component, particle size and particle size Effects of morphological distribution. The results show that the microstructure of the test steel is roughened, the volume fraction of M / A increases, the particle size increases and the number of irregular shaped M / A increases with increasing finishing temperature. With the cooling rate increasing, The volume fraction of particles decreased and the size of particles decreased. When the temperature was within 300-450 ℃, the volume fraction and particle size of M / A component all appeared the minimum around 360 ℃, Increasing and increasing the number and size of M / A components. Therefore, it is the key to effectively control the morphology distribution of M / A component in microstructure and ensure the excellent toughness by properly reducing the finishing temperature, increasing the cooling rate and choosing the proper final cooling temperature in the production of high-grade pipeline steel.