Modification of inclusions in Ni-Al maraging steels by rare earths

Tian Fangcheng; Gao Xueyun; Cao Yue; Xing Lei; Hua Liangeng; Wang Haiyan

doi:10.7513/j.issn.1004-7638.2024.06.020

Volume 45 Issue 6

Dec. 2024

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2024 > 45(6): 151-158

Tian Fangcheng, Gao Xueyun, Cao Yue, Xing Lei, Hua Liangeng, Wang Haiyan. Modification of inclusions in Ni-Al maraging steels by rare earths[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(6): 151-158. doi: 10.7513/j.issn.1004-7638.2024.06.020

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Tian Fangcheng, Gao Xueyun, Cao Yue, Xing Lei, Hua Liangeng, Wang Haiyan. Modification of inclusions in Ni-Al maraging steels by rare earths[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(6): 151-158. doi: 10.7513/j.issn.1004-7638.2024.06.020

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Modification of inclusions in Ni-Al maraging steels by rare earths

doi: 10.7513/j.issn.1004-7638.2024.06.020

Tian Fangcheng^1
,,
Gao Xueyun^{1, 2},
Cao Yue¹,
Xing Lei^{1, 2},
Hua Liangeng³,
Wang Haiyan^{1, 2
,
,}

1.
School of Materials and Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010, Inner Mongolia, China
2.
Guangdong Guangqing Metal Technology Co.， Ltd., Yangjiang 529533, Guangdong, China
3.
Inner Mongolia First Machinery Group Co., Ltd.，Baotou 014010，Inner Mongolia，China

Received Date: 2023-12-18
Available Online: 2024-12-30
Publish Date: 2024-12-30

Abstract

Abstract

Non-metallic inclusions in steel have an important influence on the ductility and toughness of ultra-high strength steels. In this paper, rare earth La and Ce elements were added to Fe-Ni-Al system martensitic aging steel, and the metamorphic mechanism of non-metallic inclusions in steel with different rare earth elements was investigated by scanning electron microscopy, energy spectrometry (SEM-EDS) and electron probe (EPMA) analyses combined with FactSage thermodynamic calculations. The results showed that the addition of rare earth elements to martensitic ageing steel resulted in the formation of rare earth-containing RE-O-S and RE-Al-O, which inhibited the formation of Al₂S₃ and had no significant effect on the formation of AlN inclusions, and the shape of the inclusions was transformed from a strip-like and irregular geometry to a near-spherical shape after the modification of the inclusions by rare earths. Thermodynamic calculations showed that after the addition of rare earth elements, the thermodynamic stability of inclusions in the steel might be formed roughly as REAlO₃ → Al₂O₃ → rare earth sulfides → AlN. After the addition of rare earths, the RE₂O₃ and Al₂O₃ had been stable in the high-temperature molten state of the liquid steel, and with the lowering of the cooling temperature inclusions formed in the order of REAlO₃ → RE₂O₂S → RES, and the inclusions of rare-earth La and Ce showed basically the same evolutionary path.
- martensitic steels,
- rare earth element,
- inclusions modification,
- thermodynamic calculation

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References

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