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| Ti and N segregation and size calculation of TiN inclusions in cord steel during solidification |
| YI Shun1，TAO Yong2，RUAN Fang1，WU Run1， LIU Jing1 |
1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education， Wuhan University of Science and Technology， Wuhan 430081， Hubei， China
2. Quality Surveillance and Inspection Department， Wuhan Iron and Steel Co.，Ltd.， Wuhan 430083， Hubei， China |
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Abstract In order to improve the detection efficiency of TiN inclusions in tire cord steel，the conditions of the TiN inclusions precipitation during solidification and the size calculation of TiN inclusions in tire cord steel were analyzed mainly on the basis of thermodynamics in this research. According to the thermodynamics analysis，the precipitation of TiN inclusions occured in the solid-liquid phase region because of the segregation of Ti and N. In addition，element N was the main factor influencing the growth of TiN inclusions. The result of verification indicated that the calculated size of TiN inclusions according to the thermodynamics growth formula was consistent with the actual values，and the average relative error was 8.62%. A suitable mathematical model was proposed for simulating the size of TiN inclusions with the data of Ti and N contents. The model had predicted the size of TiN inclusions and indicated some rationality，the result showed that the average relative error of model was 0.95%，it can be applied to the actual detection work to improve the detection efficiency of TiN inclusions.
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Received: 24 September 2015
Published: 14 April 2016
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2016, Vol. 51 
