The Influence of Mg-Based Inclusions on the Grain Boundary Mobility of Austenite in SS400 Steel
The Influence of Mg-Based Inclusions on the Grain Boundary Mobility of Austenite in SS400 Steel
复制标题
SS400钢中镁基夹杂物对奥氏体晶界活动度的影响
作者：
C. Lai;H. Lai;Y. Su;F. Huang;C. Lin;J. Kuo;Hwa
本文研究了高温下添加Mg对SS 400钢奥氏体晶粒长大的影响以及Mg基夹杂物对钢中Mg基夹杂物迁移率的影响。利用高温共焦激光扫描显微镜（HT-CSLM）对25 μ mol/L氩气保护下奥氏体的晶粒结构进行了原位观察。奥氏体晶粒尺寸呈对数正态分布。采用三维曲面拟合的晶粒生长曲线结果表明，当Mg含量为5.6 ~ 22 ppm时，生长方程参数n和Q值分别为0.2 ~ 0.26和405 ~ 752 kJ/mole。将温度从1150 °C增加到1250 °C持续20分钟并且将Mg的添加量增加5.6、11和22 ppm导致晶界速度的增加。计算了溶质拖曳和齐纳钉扎对晶界迁移率的影响。
In this study, the effects of the addition of Mg to the grain growth of austenite and the magnesium-based inclusions to mobility were investigated in SS400 steel at high temperatures. A high-temperature confocal scanning laser microscope (HT-CSLM) was employed to directly observe, in situ, the grain structure of austenite under 25 torr Ar at high temperatures. The grain size distribution of austenite showed the log-normal distribution. The results of the grain growth curves using 3D surface fitting showed that the n and Q values of the growth equation parameters ranged from 0.2 to 0.26 and from 405 kJ/mole to 752 kJ/mole, respectively, when adding 5.6–22 ppm of Mg. Increasing the temperature from 1150 to 1250 °C for 20 min and increasing the addition of Mg by 5.6, 11, and 22 ppm resulted in increases in the grain boundary velocity. The effects of solute drag and Zener pinning on grain boundary mobility were also calculated in this study.