Abstract
Effect of RE on modifying inclusions in Al-killed X80 pipeline steel was studied by Ce treatment. The results show that Ce treatment modified and refined inclusions. The typical inclusions were MnS + Al2O3–MnS → MnS + Ce–Al–O–MnS + Ce–O–MnS → MnS + Ce–S–MnS + Ce–S + Ce–O–S–MnS + Ce–O–S → Ce–S + Ce–O–S in the sample with Ce content of 0, 0.0045, 0.018 and 0.025 wt%, respectively. With the increase in Ce content from 0 to 0.025 wt%, the mean size of inclusions decreased firstly from 2.41 to 1.80 μm and then increased to 1.87 μm, and the proportion of inclusions smaller than 2 μm gradually increased, while the proportion of inclusions larger than 3 μm decreased firstly and then increased due to the aggregation of Ce–O–S inclusions. The number density, largest size and mean size of single MnS decreased after Ce treatment.
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This work is financially supported by National Nature Science Foundation of China under Grant No. 52074025 and No. 51774024.
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Cheng, W., Song, B., Yang, Z. et al. Effect of Rare Earth Ce on Modifying Inclusions in Al-killed X80 Pipeline Steel. Trans Indian Inst Met 75, 2837–2846 (2022). https://doi.org/10.1007/s12666-022-02612-7
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DOI: https://doi.org/10.1007/s12666-022-02612-7