Effect of trace Si on MgO·Al2O3 inclusion in ultra-low-carbon steel

• 作者: Lei Cao De-li Shang Xin-gang Ai Peng-liang Jin Yuan-you Xiao Guo-cheng Wang Chun-wei Liu
• 来源期刊: 钢铁研究学报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 402-412
• 页数: 11页
• 语种: 英文

摘要

There are four types of Mg–Al–Si–O inclusions observed in the Mg-treated Al-deoxidized ultra-low-carbon steel con-taining trace Si, including SiO2, 2MgO·SiO2, 3Al2O3·2SiO2, and 2MgO·2Al2O3·5SiO2 and their composite inclusions. Using FactSage, the phase relationship of Mg–Al–Si–O system at 1473–2073 K was calculated using FactSage software, and the change in Si content can change the stable region range of different Mg–Al–Si–O-based inclusions. Based on the types of inclusions observed experimentally, the formation pathways of inclusions were predicted and a kinetic model was established to describe the formation process of the xMgO·yAl2O3–Mg–Al–Si–O and xAl2O3·ySiO2–Mg–Al–Si–O inclusions.