School of Materials and Metallurgy, University of Science and Technology, Anshan, China.
Iron & Steel Research Institutes of Ansteel Group Corporation, Anshan, China.
PLoS One. 2023 Apr 3;18(4):e0275049. doi: 10.1371/journal.pone.0275049. eCollection 2023.
The effects of cooling rate, Ti content, and casting temperature on titanium compounds for high titanium steel were investigated. In-situ observation of high titanium steel during remelting and solidification was carried out by using a High Temperature Confocal Scanning Laser Microscope (HTCSLM), and the observed results were in good agreement with the thermodynamic and kinetic calculations. The observation and calculation results both show that the inclusions in high titanium steel first precipitate in the form of TiN, followed by TiC precipitates as temperature decreases, eventually forming TiCxN1-x type inclusions at room temperature. The initial precipitation temperature of the inclusions increases with the increase of Ti content in molten steel, whereas casting temperature has little effect on the initial precipitation temperature of inclusions. In addition, the size of TiN inclusions increases with the increase of Ti content in steel but decreases with the increase in cooling rate.
研究了冷却速率、钛含量和浇注温度对高钛钢中钛化合物的影响。利用高温共焦扫描激光显微镜（HTCSLM）对重熔和凝固过程中的高钛钢进行了原位观察，观察结果与热力学和动力学计算吻合较好。观察和计算结果均表明，高钛钢中的夹杂物首先以 TiN 的形式析出，随着温度的降低，然后析出 TiC 夹杂，最终在室温下形成 TiCxN1-x 型夹杂。夹杂物的初始析出温度随钢液中钛含量的增加而升高，而浇注温度对夹杂物的初始析出温度影响不大。此外，TiN 夹杂物的尺寸随钢中钛含量的增加而增大，随冷却速率的增加而减小。
