定向凝固过程硫化锰析出行为研究
Study on the precipitation behavior of MnS by directional solidification
通过不同冷却速率下的定向凝固实验准确控制高硫钢凝固过程冷却速率,研究了冷却速度与元素偏析对高硫钢中MnS析出行为的影响。研究表明,冷却速度从 0.09 oC/s增加到 0.65 oC/s,柱状区内MnS夹杂物的数密度逐渐增大。冷却速度从 0.09 oC/s增加到0.87 oC/s,柱状去内MnS夹杂物平均尺寸从 8.25 μm下降到 5.37 μm.较快的冷却速度抑制了Mn和S的宏观偏析,但加剧了微观偏析。通过偏析模型计算得到在目前的冷却速度范围内,当固相分数大于 0.82 时,MnS夹杂物开始析出,随后硫和锰的元素偏析减弱。
The effect of cooling rate and elemental segregation on the precipitation behavior of MnS in high-sulfur steel was investigated by accurately controlling the cooling rate during solidification of high-sulfur steel through directional solidification experiments at different cooling rates.The results shown that the number density of MnS inclusions in the columnar zone gradually increased as the cooling rate increased from 0.09 oC/s to 0.65 oC/s.With the cooling rate increased from 0.09 oC/s to 0.87 oC/s,the average size of MnS inclusions in the columnar zone decreased from 8.25 μm to 5.37 μm.The faster cooling rate suppressed the macro-segregation of Mn and S,but intensified the micro-segregation.The segregation model calculates that in the current cooling rate range,the MnS inclusions start to precipitate when the solid phase fraction is greater than 0.82,and then the segregation of S and Mn
周全磊;杨文;张立峰;
北京科技大学冶金与生态工程学院,北京 100083;北京科技大学冶金与生态工程学院,北京 100083;北方工业大学机械与材料工程学院,北京 100144;
High sulfur steel Directional solidification MnS inclusion Element segregation
613-616 / 4
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