| 定向凝固研究易切削钢中硫化物的生成行为 |
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| 引用本文： | 夏云进,王福明,李长荣,王金龙,吴朝昀.定向凝固研究易切削钢中硫化物的生成行为[J].北京科技大学学报,2012(2):118-124. |
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| 作者姓名： | 夏云进 王福明 李长荣 王金龙 吴朝昀 |
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| 作者单位： | 北京科技大学冶金与生态工程学院;北京科技大学生态与循环冶金教育部重点实验室;北京科技大学材料科学与工程学院 |
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| 基金项目： | 国家自然科学基金资助项目(51174020);北京市教育委员会共建项目专项资助课题 |
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| 摘 要： | 通过定向凝固实验研究了易切削钢中硫化物的生成过程,并建立了枝晶臂间距、硫化物的平均直径与凝固条件之间的关系.实验结果表明:随着温度梯度和拉速的增大,MnS的平均直径减小,数量增多;定向凝固过程中硫化物的完全析出温度大约在固相线温度下100℃左右,MnS形态的改变,主要受其组成元素的活度影响,即MnS形态的改变受其界面自由能的影响;对定向凝固实验中钢的枝晶臂间距、硫化物的平均直径与凝固条件的关系进行了拟合,拟合结果与前人研究结果相吻合.
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| 关 键 词： | 易切削钢 夹杂物 硫化锰 枝晶 定向凝固 |
Study on the formation behavior of sulfides in free-cutting steel by unidirectional solidification |
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| XIA Yun-jin,WANG Fu-ming,LI Chang-rong,WANG Jin-long,WU Zhao-yun.Study on the formation behavior of sulfides in free-cutting steel by unidirectional solidification[J].Journal of University of Science and Technology Beijing,2012(2):118-124. |
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| Authors: | XIA Yun-jin WANG Fu-ming LI Chang-rong WANG Jin-long WU Zhao-yun |
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| Institution: | 1,2) 1) School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 2) Key Lab of the Ministry of Education of China for Ecologic & Recycle Metallurgy,University of Science and Technology Beijing,Beijing 100083,China 3) School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | The formation behavior of sulfides in free-cutting steel was investigated under unidirectional solidification.The relations of the dendrite arm spacing and sulfides’ average diameter to solidification conditions were established.Experimental results show that the average diameter of MnS inclusions decreases with increasing temperature gradient around the solid/liquid zone and casting speed,but the number of MnS inclusions increases.The complete precipitation temperature of MnS is about 100 ℃ lower than the solidus temperature.The morphological changes of MnS are mainly effected by the activities of constituent elements,in other words,they are mainly influenced by interfacial energy.The relations of the dendrite arm spacing and sulfides’ average diameter to solidification conditions were regressed,and the regression results are basically in agreement with the ones of previous researchers. |
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| Keywords: | free-cutting steel inclusions manganese sulfide dendrites unidirectional solidification |
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