Study on Characteristics of CaO-MgO-Al2O3 Inclusions in GCr15 Bearing Steel at 120 t LF Refining

雷家柳; 杨玲; 廖凯; 付勇军; 张玉成

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Study on Characteristics of CaO-MgO-Al2O3 Inclusions in GCr15 Bearing Steel at 120 t LF Refining

更新时间：2026-01-21

- Study on Characteristics of CaO-MgO-Al2O3 Inclusions in GCr15 Bearing Steel at 120 t LF Refining
- Special Steel Vol. 42, Issue 5, Pages: 11-15(2021)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：03 March 2021，
  
  Online First：12 December 2022，
  
  Published：12 December 2021
- 稿件说明：
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雷家柳, 杨玲, 廖凯, et al. 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.
DOI：

雷家柳, 杨玲, 廖凯, et al. 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. DOI：

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-Al

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A1

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 • Al

/CaO • A1

/A1

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 • A1

转化为CaO-MgO-Al

夹杂。精炼过程优先形成MgO • A1

夹杂

随后

Ca会与钢液中的MgO -Al

夹杂发生反应，进而形成CaO-MgO-Al

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-Al

-(CaS)复合氧化物夹杂。

Abstract

The formation mechanism of CaO-MgO-Al

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 Al

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 • Al

/CaO • A1

/A1

shows that MgO •Al

can be transformed into CaO-MgO-Al

inclusions when [ Ca

]

is greater than 1.2 x 10

-6

in molten steel. The MgO • A1

inclusion would be formed firstly in the refining process

afterwards

the Ca would react with MgO • A1

inclusion to form CaO-MgO-A1

composite inclusion. As a result of the precipitation of CaS inclusion in the solidification

therefor the CaO-MgO-Al

-(CaS) composite oxide inclusion is detected in the final steel sample.

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