外添TiO<sub>2</sub>粒子对中低碳钢组织及夹杂物的影响

吴晓燕; 李秋平; 莫文玲; 张庆军; 朱立光

doi:10.7513/j.issn.1004-7638.2021.01.018

外添TiO₂粒子对中低碳钢组织及夹杂物的影响

doi: 10.7513/j.issn.1004-7638.2021.01.018

吴晓燕^1,,
李秋平¹,
莫文玲²,
张庆军^1, ,,
朱立光^{1, 3}

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

基金项目: 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）。

详细信息

作者简介:
吴晓燕（1989—），女，河北保定人，博士生，主要从事凝固理论与铸坯质量控制研究，E-mail：15031582910@163.com；

通讯作者:
张庆军(1965—)，男，河北唐山人，教授，博士，从事材料结构与性能研究，E-mail：zhangqingjun@ncst.edu.cn

中图分类号: TF76
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出版历程
- 收稿日期: 2020-10-13
- 刊出日期: 2021-02-10

Effect of externally added TiO₂ particles on microstructure and inclusions of medium and low carbon steel

1.
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
2.
College of Yisheng, North China University of Science and Technology, Tangshan 063210, Hebei, China
3.
College of Material, Hebei University of Science and Technology, Shijiazhuang 050000, Hebei, China

摘要

摘要: 使用HLLG1217型高温电阻炉对中低碳钢重熔后添加TiO₂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TiO₂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0.29 μm变为3.06 μm，1 μm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TiO₂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。
- 中低碳钢 /
- TiO₂粒子 /
- 晶内铁素体 /
- 组织 /
- 夹杂物
Abstract: TiO₂ 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-4800 scanning electron microscope and other equipment. The results show that after adding TiO₂ 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% to 6.53%, which fully indicates that the TiO₂ particles re-polymerizewith the original inclusions to form composite inclusions after adding, and induce acicular ferrite nucleation and precipitation.
- medium and low carbon steel /
- TiO₂ particles /
- IGF /
- microstructure /
- inclusions

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图 1 冶炼控温制度

Figure 1. Temperature changing curve of steel during remelting

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图 2 Ti氧化物晶体结构

Figure 2. Ti oxide crystal structure diagram

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图 3 TiO₂粒子SEM和EDS图

Figure 3. SEM and EDS diagram of TiO₂ powder

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图 4 TiO₂粒子XRD谱

Figure 4. XRD pattern of TiO₂ powder

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图 5 金相显微镜下组织形貌

Figure 5. Microstructure of steel sample with addition of TiO₂ particles

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图 6 金相显微镜下夹杂物形貌及分布

Figure 6. Morphology and distribution of inclusions under metallurgical microscope

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图 7 夹杂物形状统计结果

Figure 7. Inclusion shape statistics result

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图 8 夹杂物尺寸分布结果

Figure 8. Inclusion size distribution results

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图 9 样品1夹杂物与组织的形貌和能谱分析结果

Figure 9. Microstructure and inclusion in Sample 1#, energy spectrum analysis results of inclusions circled in left picture

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图 10 样品2夹杂物与组织的形貌和能谱分析结果

Figure 10. Microstructure and inclusion in Sample 2#, energy spectrum analysis results of inclusions circled in left picture

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表 1 样品2元素成分检测结果

Table 1. Chemical compositions of Sample 2 %

C	Mn	S	P	Si	Als	Ti
0.13	1.55	0.004	0.005	0.31	0.07	0.03

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表 2 Ti氧化物晶体结构信息

Table 2. Ti oxide crystal structure information

名称	空间结构	空间群	晶胞参数/nm			夹角/(°)
名称	空间结构	空间群	a	b	c	α	β	γ
TiO	面心立方	Fm-3	4.175	4.175	4.175	90	90	90
Ti₂O₃	刚玉结构	R-3c	5.148	5.148	13.636	90	90	120
Ti₃O₅	黑钛石型结构	C12/m1	9.752	3.802	9.442	90	91.55	90
TiO₂	金红石结构	P42/mnm	4.594	4.594	2.959	90	90	90

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参考文献(8)

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