|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Solidification Science and Engineering
||N-11: Study on the Formation and Control of TiN Inclusion in Mushy Zone for High Ti Microalloyed Steel
||Tao Liu, Dengfu Chen, Wenjie He, Mujun Long, Lintao Gui, Huamei Duan, Junsheng Cao
|On-Site Speaker (Planned)
The coarse TiN inclusions can act as potential fracture initiation sites and deteriorate the impact toughness of steels. The experimental observation results indicated that vast coarse TiN inclusions existed within high Ti microalloyed steel. Meanwhile, it was found that CaS inclusions could became effectively a heterogeneous nucleation substrate for the precipitation of TiN inclusions, and the size of TiN inclusions with CaS core was obviously larger than those TiN inclusions without CaS core. Additionally, the thermodynamic calculation result showed that TiN inclusions began to precipitate at the end of solidification from the dendrites front; moreover, the preexisted CaS inclusions promoted the formation of TiN inclusions. Decreasing sulfur and nitrogen content could significantly reduce the precipitation temperature and the final size of CaS and TiN inclusions. Furthermore, TiN inclusions could be prevented from precipitation at the surface of CaS inclusions when the S content of molten steel was below 0.00032 wt%.
||Planned: Supplemental Proceedings volume