A Model for Niobium Carbide of Precipitation in Austenite and Its Application in Low Carbon Steel Produced by CSP
A precipitation model was developed to predict the radius and volume fraction of NbC in low carbon steel in the deformation of compact strip production (CSP), which is based on the nucleation theory and the growth model. In this model, the mass balance between different solutes, soft-impingement and the Gibbs-Thompson effect were taken into account. The precipitates were assumed to exclusively form on the dislocation and dynamic effects as well as static recovery were ignored. According to A. Yoshie model, the order of the magnitude of the average dislocation destiny is 1013 ill the Fe-0.046Nb-0.053C steel after the six pass rolling of the CSP production line. NbC precipitate at 2s after rolling. As the temperature decreases and the strain increases, the maximum radius becomes larger and larger. After six pass rolling, the maximum radius is 57nm. With the increase of the true strain and the decrease of the temperature, the average radius decrease. And the average radius is 27nm when roiling finish. The volume fraction of NbC is 0.0011% and much lower than the equilibrium volume fraction 0.0496%.
compact strip production niobium carbide precipitation model low carbon steel
XIANG Song LIU Guo-quan
School of Materials and Metallurgy, Guizhou University, Guiyang 550003, Guizhou, China The Key Labor School of Materials Science and Engineering, University of Science and Technology, Beijing 100083, C
国际会议
2009年薄板坯连铸连轧国际研讨会(TSCR 2009)(2009 International Symposium on Thin Slab Casting and Rolling)
南京
英文
222-228
2009-05-13(万方平台首次上网日期,不代表论文的发表时间)