GCr15轴承钢120 t LF精炼终点CaO-MgO-Al2O3夹杂的特性研究

特殊钢 ›› 2021, Vol. 42 ›› Issue (5): 11-15.

所属专题：轴承钢；夹杂物控制

GCr15轴承钢120 t LF精炼终点CaO-MgO-Al₂O₃夹杂的特性研究

雷家柳¹，杨玲², 廖凯²，付勇军¹, 张玉成¹

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

收稿日期:2021-03-03 出版日期:2021-10-01 发布日期:2022-12-12
作者简介:雷家柳(1987-)，男，博士，副教授，2011年武汉科技大学(本科)毕业，钢中夹杂物控制。

Study on Characteristics of CaO-MgO-Al₂O₃Inclusions in GCr15 Bearing Steel at 120 t LF Refining

Lei Jialiu¹, Yang Ling², Liao Kai² , Fu Yongjun¹ , Zhang Yucheng¹

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

Received:2021-03-03 Published:2021-10-01 Online:2022-12-12

摘要/Abstract

摘要： 采用ASPEX自动扫描电子显微鏡夹杂物分析系统，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A1₂O₃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 • A1₂O₃/A1₂O₃夹杂的稳定存在区图表明，当钢液中Ca大于1.2x10^-6时,就可使MgO • A1₂O₃转化为CaO-MgO-Al₂O₃夹杂。精炼过程优先形成MgO • A1₂O₃夹杂,随后,Ca会与钢液中的MgO -Al₂O₃夹杂发生反应，进而形成CaO-MgO-Al₂O₃复合夹杂。由于在钢液凝固过程中CaS夹杂的析出，因此，最终试样钢中检测到了 CaO-MgO-Al₂O₃-(CaS)复合氧化物夹杂。

关键词: GCr15轴承钢, LF精炼终点, CaO-MgO-Al₂O₃, 夹杂, 形成机理

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 ^-6in 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.

雷家柳, 杨玲, 廖凯, 付勇军, 张玉成. GCr15轴承钢120 t LF精炼终点CaO-MgO-Al₂O₃夹杂的特性研究[J]. 特殊钢, 2021, 42(5): 11-15.

Lei Jialiu, Yang Ling, Liao Kai , Fu Yongjun and Zhang Yucheng. Study on Characteristics of CaO-MgO-Al₂O₃Inclusions in GCr15 Bearing Steel at 120 t LF Refining[J]. Special Steel, 2021, 42(5): 11-15.

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GCr15轴承钢120 t LF精炼终点CaO-MgO-Al₂O₃夹杂的特性研究

Study on Characteristics of CaO-MgO-Al₂O₃Inclusions in GCr15 Bearing Steel at 120 t LF Refining

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