Control of Non-metallic Inclusions by Slag-metal Reactions for High Strength Alloying Steels

被引：56

作者：

Jiang, M. ^{[1
]}

Wang, X. H. ^{[1
]}

Wang, W. J. ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China

来源：

STEEL RESEARCH INTERNATIONAL | 2010年 / 81卷 / 09期

关键词：

non-metallic inclusion; spinel; slag; high strength alloying steel; refining; fatigue;

D O I：

10.1002/srin.201000065

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A laboratory study was carried out to investigate non-metallic inclusions in high strength alloying steel refined by high basicity slag. The results indicated that the inclusions were mainly of the CaO-MgO-Al2O3 system, Al2O3-MgO and MgO-based inclusions. The steel/slag reaction time and Al2O3 content in slag had a great effect on inclusions characteristics. With the reaction time increasing from 30 to 180 minutes, inclusions experienced a transformation process: from mainly Al2O3-MgO system and MgO-based inclusions to spherical CaO-MgO-Al2O3 system inclusions surrounded by a lower melting temperature surface layer of CaO-Al2O3. Formation and transformation mechanisms of the inclusions were given based on the results. It was also found that with Al2O3 content in slag reduced from 40% to 30%, [Mg] contents in steel melts were increased and MgO in slag reached saturation, which contributed to the formation of more MgO-based inclusions and a more scattered inclusion composition distribution after 90 min reaction.

引用

页码：759 / 765

页数：7

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