| GCr15轴承钢120t LF精炼终点CaO-MgO-Al2O3夹杂的特性研究 |
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| 引用本文： | 雷家柳,杨玲,廖凯,付勇军,张玉成. GCr15轴承钢120t LF精炼终点CaO-MgO-Al2O3夹杂的特性研究[J]. 特殊钢, 2021, 42(5): 11-15 |
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| 作者姓名： | 雷家柳 杨玲 廖凯 付勇军 张玉成 |
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| 作者单位： | 1.湖北理工学院材料科学与工程学院冶金工程系，黄石 435003 ；2.湖北省黄石市产品质量监督检验所，黄石 435000 |
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| 摘 要： | 采用ASPEX自动扫描电子显微镜夹杂物分析系统,结合热力学理论分析,研究了GCr15轴承钢LF精炼终点CaO-MgO-Al2O3夹杂的形成机理.结果 表明,LF精炼开始达到稳定时,钢液中的夹杂物主要以Al2O3夹杂为主,到LF精炼终点时演变成为近似球形的Al-Mg-Ca-(S)类复合夹杂.MgO·Al2O3/CaO·A...
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| 关 键 词： | GCr15轴承钢 LF精炼终点 CaO-MgO-Al2O3夹杂 形成机理 |
| 收稿时间： | 2021-03-03 |
Study on Characteristics of CaO-MgO-Al2O3 Inclusions in GCr15 Bearing Steel at 120 t LF Refining |
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| Lei Jialiu,Yang Ling,Liao Kai,Fu Yongjun and Zhang Yucheng. Study on Characteristics of CaO-MgO-Al2O3 Inclusions in GCr15 Bearing Steel at 120 t LF Refining[J]. Special Steel, 2021, 42(5): 11-15 |
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| Authors: | Lei Jialiu Yang Ling Liao Kai Fu Yongjun Zhang Yucheng |
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| Affiliation: | 1. Department of metallurgy engineering,School of Materials Science and Engineering,Hubei Polytechnic University, Huangshi 435003 ; 2. Hubei Huangshi Product Quality Supervision and Inspection Institute, Huangshi 435000 |
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| Abstract: | The formation mechanism of CaO-MgO-Al2O3 inclusions in GCr15 bearing steel at LF refining end point is studied by ASPEX automatic scanning electron microscope combined with thermodynamic theory analysis. The results show that Al2O3 is the main type inclusion in molten steel when the LF refining started to reach stability, and then evolves into an approximately spherical Al-Mg-Ca-( S) type composite inclusion at LF refining end. The stable phase diagram of MgO • Al2O3/CaO • A12O3/A12O3 shows that MgO •Al2O3 can be transformed into CaO-MgO-Al2O3 inclusions when [ Ca] is greater than 1.2 x 10 -6 in molten steel. The MgO • A12O3 inclusion would be formed firstly in the refining process, afterwards ,the Ca would react with MgO • A12O3 inclusion to form CaO-MgO-A12O3 composite inclusion. As a result of the precipitation of CaS inclusion in the solidification, therefor the CaO-MgO-Al2O3 -(CaS) composite oxide inclusion is detected in the final steel sample. |
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