Effect of Permanent Magnet Stirring on MnS Precipitation, Microstructure Evolution, and Mechanical Properties of High-Sulfur Micro-alloyed 49MnVS3 Steel
Effect of Permanent Magnet Stirring on MnS Precipitation, Microstructure Evolution, and Mechanical Properties of High-Sulfur Micro-alloyed 49MnVS3 Steel
复制标题
永磁搅拌对高硫微合金化49MnVS3钢MnS析出、组织演变及力学性能的影响
DOI：
10.1007/s11663-022-02543-0
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发表时间：
2022
影响因子：
3
通讯作者：
Jie Zeng
中科院分区：
文献类型：
--
作者：
Jianfei Peng;Wanlin Wang;Daoyuan Huang;Jie Zeng
研究了中心磁通密度为1450 Gs的永磁搅拌（PMS）在不同转速（0、50、150 rpm）下对高硫微合金化49 MnVS 3钢中MnS析出相演变、显微组织和力学性能的影响。热力学计算结果表明，MnS在1419 °C开始析出，最终凝固温度为1404 °C时，MnS占总析出量的84%以上。实验结果表明，当转速从0增加到150 rpm时，由于磁场泰勒数为9.21 × 107的永磁同步电机强化湍流流动，MnS的平均长度从7.2 μm减小到3.2 μm，且MnS的分布更加随机和均匀。随着转速从0增加到150 rpm，PMS后晶内铁素体（IGF）含量从0.3%迅速增加到3.1%，而晶界铁素体（GBF）含量从11.2%下降到9.2%。铁素体形成的增加与（Ti，V，Nb）（C，N）在更小的均匀分布的MnS的边缘上的沉淀有关。此外，49 MnVS 3钢的抗拉强度和韧性由于细小MnS析出相的增多和晶内铁素体的形成而得到提高。
An experimental investigation has been conducted with respect to the influence of permanent magnet stirring (PMS) under different rotation speeds (0, 50, 150 rpm) with a center magnetic flux density of 1450Gs on the evolution of MnS precipitation, microstructure, and mechanical properties of high-sulfur micro-alloyed 49MnVS3 steel. The thermodynamic calculation results indicated that the MnS began to precipitate in 1419 °C and accounted for more than 84 pct of the total in the final solidification temperature of 1404 °C. The experimental results revealed that when the rotation speed increased from 0 to 150 rpm, the mean length of MnS decreased from 7.2 to 3.2 μm, and the distribution of MnS precipitates was more random and uniform, due to the PMS-enhanced turbulent flow with a magnetic Taylor number of 9.21 × 107. Moreover, the content of the intragranular ferrite (IGF) increased rapidly from 0.3 to 3.1 pct, while the content of grain boundary ferrite (GBF) decreased from 11.2 to 9.2 pct after PMS with the rotation speed increased from 0 to 150 rpm. The increased formation of ferrite is related to the precipitation of (Ti, V, Nb) (C, N) on the edge of more small uniformly distributed MnS. In addition, the tensile strength and toughness of the 49MnVS3 steel are enhanced owing to the beneficial changes of increased small-sized MnS precipitates and promoted the formation of intragranular ferrite.