外添TiO_(2)粒子对中低碳钢组织及夹杂物的影响  

Effect of externally added TiO_(2) particles on microstructure and inclusions of medium and low carbon steel

作　　者：吴晓燕 李秋平 莫文玲 张庆军 朱立光 Wu Xiaoyan;Li Qiuping;Mo Wenling;Zhang Qingjun;Zhu Liguang(College of Metallurgy and Energy,North China University of Science and Technology,Hebei High Quality Steel Continuous Casting Engineering Technology Research Center,Tangshan 063210,Hebei,China;College of Yisheng,North China University of Science and Technology,Tangshan 063210,Hebei,China;College of Material,Hebei University of Science and Technology,Shijiazhuang 050000,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北省高品质钢连铸工程技术研究中心,河北唐山063210 [2]华北理工大学以升学院,河北唐山063210 [3]河北科技大学材料学院,河北石家庄050000

出　　处：《钢铁钒钛》2021年第1期113-118,共6页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金资助项目(51874137);河北省自然科学基金资助项目(E2020209044)。

摘　　要：使用HLLG1217型高温电阻炉对中低碳钢重熔后添加TiO_(2)粒子,利用金相显微镜、场发射扫描电镜等设备对得到的试样进行组织、夹杂物形貌和成分分析。结果表明:添加TiO_(2)粒子后组织由块状铁素体和珠光体转变为针状铁素体、少量块状铁素体和珠光体;球形夹杂物增多,长条形和不规则的夹杂物减少;夹杂物平均尺寸由0.29μm变为3.06μm,1μm尺寸所占比例增多达到28.69%;添加前后复合夹杂物主要成分均为O-Al-Si-Ti-Mn,Ti元素含量由3.36%增多到6.53%,表明TiO_(2)粒子加入后与原夹杂物重新聚合,形成复合夹杂物,并诱发晶内铁素体形核析出。TiO_(2) particles was added into the medium and low carbon liquid steel remelted by aHLLG1217 type high temperature resistance furnace. The microstructure, inclusion morphology and composition analysis had been investigated by an automatic metallurgical microscope, field emission S-4 800 scanning electron microscope and other equipment. The results show that after adding TiO_(2) particles, the microstructure changes from a large amount of massive ferrite and pearlite to a large amount of acicular ferrite, a small amount of massive ferrite and pearlite. Besides, more spherical inclusions appears and amount of elongated and irregular inclusions decreases. The average size of inclusions changes from 0.29 μm to 3.06 μm, and the proportion of inclusion with around 1 μm size increases to 28.69%. Main components of composite inclusions before and after addition are O-Al-Si-Ti-Mn, and the content of Ti element increases from 3.36% to6.53%, which fully indicates that the TiO_(2) particles re-polymerizewith the original inclusions to form composite inclusions after adding, and induce acicular ferrite nucleation and precipitation.

关 键 词：中低碳钢 TiO_(2)粒子 晶内铁素体 组织 夹杂物 

分 类 号：TF76[冶金工程—钢铁冶金]