含镁非调质钢中尖晶石转变机制研究

李志伟; 曾志崎; 谢剑波; 田钱仁; 付建勋

doi:10.7513/j.issn.1004-7638.2021.05.025

含镁非调质钢中尖晶石转变机制研究

doi: 10.7513/j.issn.1004-7638.2021.05.025

李志伟^1,,
曾志崎^{1, 2},
谢剑波¹,
田钱仁¹,
付建勋^1, ,

1.
先进凝固技术中心, 上海大学材料科学与工程学院, 上海 200072
2.
上海宝信软件股份有限公司信息服务事业本部, 上海 200072

基金项目: 国家自然科学基金（51874195）资助

详细信息

作者简介:
李志伟（1995—），男，硕士研究生，研究方向：高品质特殊钢中夹杂物分析，Email：zhiwei_li07@163.com

通讯作者:
付建勋（1969—），男，博士，教授，研究方向：高品质特殊钢的开发与品质提升，E-mail：fujianxun@shu.edu.cn

中图分类号: TF76
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-08
- 刊出日期: 2021-10-30

Transformation of the spine in Mg-treated non-quenched and tempered steel

Li Zhiwei^1
,,
Zeng Zhiqi^{1, 2},
Xie Jianbo¹,
Tian Qianren¹,
Fu Jianxun^{1
, ,}

1.
Center for Advanced Solidification Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200072，China
2.
Baosight Software Co., Ltd. Information Service Headquarters, Shanghai 201900,China

摘要

摘要: 基于镁改质非调质钢中夹杂物的形成特征规律，通过计算MgAl₂O₄与MnS间的错配度以揭示MnS在MgAl₂O₄上的最佳生长面，以及计算MgAl₂O₄颗粒之间的主要作用力。结果表明，不添加Mg时，铸坯边部的硫化物主要呈链状沿晶界析出，铸坯中心的硫化物主要呈杆状或角状。当钢中添加Mg后，边部和中心处夹杂物主要呈球状或链状，且尺寸较小。Mg改质后铸坯边部和中心处的夹杂物尺寸均降低，中心区域夹杂物的平均面积由14.33 μm²降低到8.78 μm²，边部区域夹杂物的平均面积由3.17 μm²降低到2.99 μm²，Mg的加入使钢中夹杂物等效面积降低。MnS晶格的(110)晶面和MgAl₂O₄的(110)晶面晶格错配度为7.65%。腔桥力是MgAl₂O₄颗粒黏附的作用力，腔桥力约为1×10⁻⁸ N。
- 非调质钢 /
- 镁 /
- MgAl₂O₄颗粒 /
- 错配度
Abstract: Based on the characteristics and formation of the Mg-treated inclusions in non-quenched and tempered steel, the misfit degrees of MgAl₂O₄+MnS was calculated to reveal the best growth surface and main action forces between the MgAl₂O₄inclusions. For Mg free steel, the sulfide in slab edge mainly precipitate in chain shape along grain boundary, while the sulfide in center slab is mainly in rod or angle shape. When Mg is added to the steel, the inclusions at the edge and center of slab are mainly spherical or chain like, and their size are small. The average area of inclusions in center area is reduced from 14.33 μm² to 8.78 μm², while in the edge area it is reduced from 3.17 μm² to 2.99 μm². Mg addition reduces the equivalent area of inclusions in the steel. The misfit degree between crystal face (110) of MnS and (110) of MgAl₂O₄ was 7.65%. The main acting force for the attachment of MgAl₂O₄ was cavity-bridge force of 1×10⁻⁸ N.
- non-quenched and tempered steel /
- Mg /
- MgAl₂O₄ inclusions /
- misfit degree

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图 1 铸坯中不同位置处夹杂物金相照片

Figure 1. Metallographic photos of the inclusions at different locations in the as-cast slab

下载: 全尺寸图片幻灯片

图 2 改质前后夹杂物的二维分布形貌

Figure 2. Two-dimensional distributions and morphologies of the inclusions before and after Mg modification

下载: 全尺寸图片幻灯片

图 3 MgAl₂O₄-MnS复合夹杂物的二维形貌及面扫图片

Figure 3. Two-dimensional morphology and elemental mappings of the MgAl₂O₄-MnS composite inclusion

下载: 全尺寸图片幻灯片

图 4 计算模型示意

Figure 4. Schematic diagram of calculation model

下载: 全尺寸图片幻灯片

图 5 不同作用力与颗粒尺寸大小的关系

Figure 5. The relationship between different action forces and particle sizes

下载: 全尺寸图片幻灯片

表 1 F45Mn30非调质钢主要化学成分

Table 1. Main chemical compositions of F45Mn30 non-quenched and tempered steel %

C	Si	Mn	P	S	Al	Mg	[O]_T
0.456	0.143	1.420	0.0112	0.088	0.007	0.0011	0.0015

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表 2 MgAl₂O₄和MnS晶格错配度计算结果

Table 2. Calculation results for lattice mismatch of MgAl₂O₄ and MnS inclusions.

	[hkl]_s	[hkl]_n	d_{[hkl]_s}	d_{[hkl]_n}	θ	晶格错配度/%
(110)MnS//(110)MgAl₂O₄	[001]	[−1-12]	2.625	2.796
	[−111]	[−1-10]	4.558	4.915	0	7.65
	[−110]	[001]	3.695	3.015
(100)MnS//(100)MgAl₂O₄	[001]	[011]	2.256	4.702
	[−111]	[010]	3.711	8.040	0	16.08
	[010]	[01-1]	2.190	4.672
(111)MnS//(111)MgAl₂O₄	[−110]	[−110]	3.695	4.682
	[−122]	[−122]	6.409	9.799	0	31.34
	[−101]	[−101]	3.695	4.702

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