Model Prediction on the Behavior of Cerium in Heavy Rail Steel

Abstract:

The thermodynamic model which quantificationally described the behavior of cerium in heavy rail steel was proposed. From the model, the effects of cerium on the composition, sequence and transformation condition of inclusions and the content of cerium dissolved in heavy rail steel were studied principally. When the cleanliness of heavy rail steel is low, the sequence of inclusions precipitation in heavy rail steel is Ce₂O₃, Ce₂O₂S, Ce₂S₃ and CeS. With increasing the cleanliness of steel, the sequence of inclusions precipitation is Ce₂O₂S and CeS. At 1783 K, the necessary condition of Ce₂O₃ precipitation in heavy rail steel is a_o/a_s≥0.186, for Ce₂S₃ precipitation is a_o/a_s≤0.394. The content of cerium dissolved in heavy rail steel is mainly affected by Ce₂S₃ inclusion. With the precipitations of all inclusions being stable, the curve between the dissolved cerium content and cerium addition becomes linear.

• Periodical: Advanced Materials Research (Volumes 255-260)
• Pages: 3984-3987
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.255-260.3984
• Online since: May 2011
• Authors: Cheng Jun Liu, Hong Liang Liu, Mao Fa Jiang
• Keywords: Heavy Rail Steel, Inclusion, Rare Earth (RE), Thermodynamic Model

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