| Ti-Mg复合脱氧和硫含量对钢中夹杂物特征及MnS析出行为的影响 |
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| 引用本文： | 郑万, 吴振华, 李光强, 朱诚意. Ti-Mg复合脱氧和硫含量对钢中夹杂物特征及MnS析出行为的影响[J]. 工程科学学报, 2015, 37(3): 292-300. DOI: 10.13374/j.issn2095-9389.2015.03.005 |
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| 作者姓名： | 郑万 吴振华 李光强 朱诚意 |
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| 作者单位： | 1.武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室, 武汉 430081 |
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| 基金项目： | 国家自然科学基金;湖北省自然科学基金创新群体项目;武汉科技大学科研启动基金 |
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| 摘 要： | 采用扫描电镜/能谱仪表征了管线钢中夹杂物的形貌、尺寸、成分及数量,考察了不同Ti/Mg比的钢中夹杂物特征、硫含量及脱氧产物数量对MnS析出行为的影响,并进行了热力学计算.结果表明：Ti-Mg脱氧钢中夹杂物以MgO-Al2O3-Ti2O3、MgO-Ti2O3或MgO为核心,表面包裹或局部析出MnS,粒径小于1.3μm,数量为300~450 mm-2,形貌为圆形、多边形和方形;夹杂物中Ti/Mg原子数比为0.05~0.2时,夹杂物细小且近圆形;随硫含量减少,凝固过程中MnS析出倾向减小,MnS在夹杂物表面由包裹析出向局部析出转变,提高氧化物夹杂数量,有利于细小MnS的包裹或局部异质形核;Ti-Mg复合脱氧产物细小、弥散,可作为MnS异质形核核心,可同时降低MnS及氧化物的危害.
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| 关 键 词： | 管线钢 脱氧 硫含量 夹杂物 硫化锰 析出行为 |
| 收稿时间： | 2013-11-10 |
Effects of Ti-Mg complex deoxidation and sulfur content on the characteristics of inclusions and the precipitation behavior of MnS |
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| ZHENG Wan, WU Zhen-hua, LI Guang-qiang, ZHU Cheng-yi. Effects of Ti-Mg complex deoxidation and sulfur content on the characteristics of inclusions and the precipitation behavior of MnS[J]. Chinese Journal of Engineering, 2015, 37(3): 292-300. DOI: 10.13374/j.issn2095-9389.2015.03.005 |
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| Authors: | ZHENG Wan WU Zhen-hua LI Guang-qiang ZHU Cheng-yi |
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| Affiliation: | 1.Key Laboratory for Ferrous Metallurgy and Resources Utilization(Ministry of Education), Wuhan University of Science and Technology, Wuhan 430081, China |
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| Abstract: | The morphology, size, composition, and number of inclusions in pipeline steel were characterized by scanning electron microscopy and energy dispersive spectroscopy. The characteristics of the inclusions with different Ti/Mg ratios as well as the influence of sulfur content and the number of deoxidation products on the precipitation behavior of MnS were investigated, and the corresponding thermodynamic calculations were carried out. It is found that the core of the inclusions is mainly composed of MgO-Al2O3-Ti2O3, MgO-Ti2O3 or MgO, and then MnS wraps or locally precipitates on them. The inclusions have the average size smaller than 1.3 txm and the number of 300 to 450 mm-2; moreover, their morphology is diverse such as round, polygonal and square. When the Ti/Mg atomic ratio is 0.05 to 0.2, the inclusions are round and small. With the decrease of sulfur content, MnS less tends to precipitate during solidification, its ways of precipitation on the inclusion surface will change from wrapped to local precipitated. A great number of oxides is conducive to the heterogeneous nucleation of more finely MnS on the surface of complex oxides. The Ti-Mg complex deoxidation products are small and dispersed, can become the heterogeneous nucleation core of MnS, and may reduce the harm of MnS and oxides at the same time. |
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| Keywords: | pipeline steel deoxidation sulfur content inclusions manganese sulfide precipitation behavior |
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