Thermodynamic analysis of inclusion control in Mg-Al-Ti system oxide metallurgy technology

Guo Zhihong; Shi Saichao; Wang Qi; Ma Guojin; Wang Genji; Zhu Liguang

doi:10.7513/j.issn.1004-7638.2022.06.019

Volume 43 Issue 6

Jan. 2023

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Guo Zhihong, Shi Saichao, Wang Qi, Ma Guojin, Wang Genji, Zhu Liguang. Thermodynamic analysis of inclusion control in Mg-Al-Ti system oxide metallurgy technology[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 126-137. doi: 10.7513/j.issn.1004-7638.2022.06.019

Citation:

Guo Zhihong, Shi Saichao, Wang Qi, Ma Guojin, Wang Genji, Zhu Liguang. Thermodynamic analysis of inclusion control in Mg-Al-Ti system oxide metallurgy technology[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 126-137. doi: 10.7513/j.issn.1004-7638.2022.06.019

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Thermodynamic analysis of inclusion control in Mg-Al-Ti system oxide metallurgy technology

doi: 10.7513/j.issn.1004-7638.2022.06.019

Guo Zhihong^{1, 2
,},
Shi Saichao^{1, 2},
Wang Qi^{1, 2
,
,},
Ma Guojin³,
Wang Genji³,
Zhu Liguang^{1, 2, 4}

1.
School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China
2.
Hebei Key Laboratory of Materials Near-net Forming Technology, Shijiazhuang 050018, Hebei, China
3.
Shougang Jingtang Iron and Steel Integrated Co., Ltd., Tangshan 063210, Hebei, China
4.
College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China

Received Date: 2022-03-31
Publish Date: 2023-01-13

Abstract

Abstract

The oxide metallurgy technology with the low aluminum condition is carried out in marine steel and further expands the adjustment range of alloy compositions, which is beneficial to promote the effective inclusion of inducing acicular ferrite. This research has a significant potential application to improve the toughness of heat-affected zones in high-heat input welding. Thermodynamic equilibrium calculations between liquid steel and inclusion are based on EH420 steel using FactSage software. The effects of coupling changes of the Mg-Al-Ti deoxidation system and oxygen content on the types, conditions, and amounts of inclusions precipitated in steel were systematically analyzed. Equilibrium experiments are designed to confirm the validity of thermodynamic calculations. This study provides theoretical guidance to control inclusion in high heat input welding for EH420 marine steel. The results recommended controlling the Mg, Al, and Ti in steel are 0.0020%, 0.0080%～0.010%, and 0.010%～0.020%, respectively. On this basis, Mg-Al-Ti-O composite inclusion + MgO inclusion are formed when the content of T.O. is 0.0030%. The composite inclusion of Mg-Al-Ti-O is formed separately, with the T.O. content at 0.0060%.
- marine steel,
- EH420,
- inclusion control,
- Mg-Al-Ti oxide,
- thermodynamic calculation

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References(31)

References

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