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| Thermodynamic Study on the Occurrence of Cerium in 253MA Heat-Resistant Steel |
| LI Yan-dong，LIU Cheng-jun，JIANG Mao-fa |
| Key Laboratory for Ecological Metallurgy of Multimetallic Minerals Ministry of Education, Northeastern University, Shenyang 110819，Liaoning,China |
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Abstract A coupled thermodynamic model of inclusions precipitation and solute elements microsegregation during solidification of 253MA steel was established basing on the reaction equilibrium principle of multiphase and polycomponent and the redistribution theory of solute elements in the interface of liquid and solid during solidification. Then the accuracy of this model was validated through the commercial test. Using this model, the dissolved cerium content in 253MA steel with different conditions, such as cerium addition, oxygen content and sulfur content, was calculated. Under the rated condition of the model, some results were obtained as follows. In order to keep high dissolved cerium content in 253MA steel, the cerium addition(mass fraction) must be higher than 0. 025% and ［%O］+［%S］<0. 009(［%O］<0. 0046), 2［%O］+［%S］<0. 014(［%O］>0. 0046).
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Received: 22 April 2014
Published: 26 June 2014
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2014, Vol. 21 
