Effect of La on non-metallic inclusions in FeCrAl alloy

Wen Jiahang; Qi Jie; Liu Chengjun

doi:10.7513/j.issn.1004-7638.2024.01.019

Volume 45 Issue 1

Feb. 2024

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Wen Jiahang, Qi Jie, Liu Chengjun. Effect of La on non-metallic inclusions in FeCrAl alloy[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 131-138. doi: 10.7513/j.issn.1004-7638.2024.01.019

Citation:

Wen Jiahang, Qi Jie, Liu Chengjun. Effect of La on non-metallic inclusions in FeCrAl alloy[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 131-138. doi: 10.7513/j.issn.1004-7638.2024.01.019

Wen Jiahang, Qi Jie, Liu Chengjun. Effect of La on non-metallic inclusions in FeCrAl alloy[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 131-138. doi: 10.7513/j.issn.1004-7638.2024.01.019

Citation:

Wen Jiahang, Qi Jie, Liu Chengjun. Effect of La on non-metallic inclusions in FeCrAl alloy[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 131-138. doi: 10.7513/j.issn.1004-7638.2024.01.019

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Effect of La on non-metallic inclusions in FeCrAl alloy

doi: 10.7513/j.issn.1004-7638.2024.01.019

Wen Jiahang^{1, 2
,},
Qi Jie^{1, 2
,
,},
Liu Chengjun^{1, 2}

1.
Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, Liaoning, China
2.
School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China

Received Date: 2022-12-18
Publish Date: 2024-02-29

Abstract

Abstract

In order to study the influence of rare earth La addition on the type and distribution of inclusions in FeCrAl alloys, based on thermodynamic analysis, the three-dimensional morphology and composition of inclusions were observed and analyzed by SEM-EDS, and the size and quantity of inclusions were statistically analyzed. The results show that single Al₂O₃ only inclusion exists in FeCrAl alloy at 1600 ℃. During the solidification process, with the increase of the solid fraction in the system, AlN precipitates at the solidification front. After adding 0.0093% La, Al₂O₃ transforms into LaAlO₃. When the addition amount of La is 0.0378%, the type of inclusions is LaAlO₃+La₂O₂S, and the number of inclusions increases significantly. As holding time prolongs, the proportion of La₂O₂S gradually increases. When the addition amount of La is 0.0964%, the proportion of La₂O₂S is further increased. After 60 min of heat preservation, single La₂O₂S only inclusion exists stably in the steel. The particle size of the inclusions is significantly affected by the aggregation properties of the inclusions. In the samples containing single LaAlO₃ only at 1600 ℃ for 60 min, LaAlO₃ shows a strong tendency to aggregate in the early stage of the incubation, and average particle size of the inclusions firstly increases from 2.34 μm to 3.31 μm, and then decreases to 1.93 μm. The tendency of La₂O₂S to aggregate is weak. In the samples containing La₂O₂S, average particle size of inclusions is small and uniform, in the early stage of heat preservation, average particle size of inclusions remains in the range of 1.8−2.0 μm.
- FeCrAl alloy,
- La,
- inclusions,
- AlN precipitates,
- agglomeration

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References(34)

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