稀土钇对高碳硬线钢中氧化铝夹杂物的改性研究  

Modification of Alumina Inclusions in High-Carbon Hard Wire Steel by Rare Earth Yttrium

作　　者：熊星强 李长荣[1] 陈龙海 陈璐[1] 宁州韶 Xiong Xingqiang;Li Changrong;Chen Longhai;Chen Lu;Ning Zhoushao(Guizhou University Guizhou Province Key Laboratory for Metallurgical Engineering and Process Energy Saving,College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学材料与冶金学院贵州省冶金工程与过程节能重点实验室,贵州贵阳550025

出　　处：《稀有金属》2024年第4期508-516,共9页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(52074095,51864013)资助。

摘　　要：为了改性铝脱氧钢中的夹杂物(主要是Al_(2)O_(3)),采用稀土钇处理的实验方案。基于经典热力学以及Factsage软件计算了钇活度对夹杂物的演变规律,结果表明,稀土钇加入后主要和钢液中的O,S和Al结合,阻碍了Al_(2)O_(3)夹杂物的聚集和长大。通过凝固过程中夹杂物类型的变化规律,研究了稀土钇对夹杂物的改性过程。计算了钢中夹杂物的尺寸分布、数量密度、均匀度、最小界面间距、面度密度等,结果表明钇对夹杂物起到了不同程度的改性效果。当钇的添加量为0.032%时,夹杂物平均直径为2.97μm,均匀度为0.68,夹杂物最小界面间距大于10μm的比例为24.1%,夹杂物的面积密度集中在0.037%;当钇的添加量为0.065%时,夹杂物平均直径为2.34μm,均匀度为0.76,夹杂物最小界面间距大于10μm的比例为33.7%,夹杂物的面积密度集中在0.024%;当钇的添加量为0.087%时,夹杂物平均直径为1.71μm,均匀度为1.02,夹杂物最小界面间距大于10μm的比例为46.7%,夹杂物的面积密度集中在0.015%。理论计算和实验结果基本验证了3组实验中的最佳方案是添加0.087%的钇。High-carbon hard wire steel is widely used in production,and its performance is related to the number,size,shape and distribution of inclusions in the steel.Even a single large inclusion can weaken the stretchability of the wire.Therefore,it is necessary to remove or refine the inclusions in the steel to improve the drawing performance of the steel.In the steelmaking process,aluminum strips are often used for deoxidation.In order to modify the inclusions in aluminum deoxidized steel(Al_(2)O_(3)),an experimental program of rare earth yttrium treatment of inclusions in steel was used.Under the same experimental conditions,aluminum strips were added first,and then rare earth yttrium with different contents was added to explore the effect of yttrium on the modification of inclusions.Based on classical thermodynamics and Factsage software,the evolution law of yttrium activity on inclusions was calculated.The results showed that at about 1800 K(melting temperature of molten steel),yttrium was difficult to react with Al_(2)O_(3) inclusions,but Al_(2)O_(3)was modification by rare earth yttrium at low temperature(solidification process).Through the modification of Al_(2)O_(3) inclusions,the brittle inclusions in the steel were modified into tough inclusions,which reduced the harm of inclusions.After the rare earth yttrium was added,it combined with O,S and Al in the molten steel to generate yttrium oxide,yttrium oxysulfide,aluminum oxide,and yttrium sulfide.It hindered the aggregation and growth of Al_(2)O_(3) inclusions and played a role in refining the inclusions in steel.According to the change rule of inclusion types during solidification,the modification process of rare earth yttrium to inclusions was discussed.When the content of yttrium was sufficient(yttrium content exceeded 0.065%),the inclusions in the steel were fully modified,and the final inclusions were Y_(2)O_(3) and Y_(2)S_(3).The experiment was carried out with an intermediate frequency induction furnace.Pure iron,recarburizer and Fe-Mn alloy were added t

关 键 词：高碳硬线钢 Al_(2)O_(3)夹杂物 夹杂物改性 稀土钇 

分 类 号：TF748.52[冶金工程—钢铁冶金]