In SituObservation of the MnS Precipitation Behavior in High-Sulfur Microalloyed Steel Under Different Cooling Rates
In SituObservation of the MnS Precipitation Behavior in High-Sulfur Microalloyed Steel Under Different Cooling Rates
复制标题
高硫微合金钢不同冷却速率下MnS析出行为的原位观察
DOI：
10.1007/s11663-020-01946-1
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发表时间：
2020
影响因子：
3
通讯作者：
Xia Li
中科院分区：
文献类型：
--
作者：
Jie Zeng;Chenyang Zhu;Wanlin Wang;Xia Li
采用共聚焦激光扫描显微镜（CLSM）对高硫微合金钢中MnS的析出行为进行了原位观察，冷却速率从50 °C/min增加到400 °C/min。在CLSM实验前后，利用扫描电子显微镜（SEM）和X射线能谱仪（EDS）进行了差示扫描量热分析和热力学计算。结果表明，在CLSM测试中，随着冷却速率从50 °C/min增加到400 °C/min，MnS的初始沉淀温度从1440.0 °C降低到1429.6 ° C，并且最终温度从1413.7 °C降低到1381.6 °C。在熔体表面观察到三种典型的MnS形貌，即小角状、球状和大枝晶簇状MnS。当冷却速率从50 °C/min增加到400 °C/min时，随着MnS过饱和度的增加和局部凝固时间的显著缩短，枝晶间的大团簇MnS变得更薄，枝晶处形成更多的小角状MnS析出物。
In situobservation of the precipitation behavior of MnS in a high-sulfur microalloyed steel has been conducted by means of a confocal laser scanning microscopy (CLSM) with cooling rates increased from 50 to 400 °C/min. Differential scanning calorimetry analysis and thermodynamic calculation were carried out prior to and following the CLSM experiments using scanning electron microscopy (SEM) and X-ray energy-dispersive spectrometer. The results suggested that the initial MnS precipitate temperature decreased from 1440.0 °C to 1429.6 °C and the final temperature reduced from 1413.7 °C to 1381.6 °C as the cooling rate increased from 50 to 400 °C/min in the CLSM test. Three typical MnS morphologies of small angular, globular and larger dendrite cluster MnS were observed in the melting surface. Furthermore, with an increase in the supersaturation of MnS and a significant reduction of the local solidification time when the cooling rate increased from 50 to 400 °C/min, the large clusters MnS at interdendritic regions became thinner and more small angular MnS precipitates formed at dendrite crystals.