Crystallization Behavior of the CaO–SiO2–Al2O3–MgO System Inclusions

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-08-04 DOI:10.1002/srin.202400253

Yong Wang, Sohei Sukenaga, Masanori Tashiro, Hua Zhang, Hongwei Ni, Hiroyuki Shibata

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Abstract

The crystallization process of low melting point CaO–SiO2–Al2O3–MgO system inclusions during the continuous casting and hot rolling process greatly affects the deformability of inclusions. The effect of Al2O3 and MgO contents on the crystallization characteristics of CaO–SiO2–Al2O3–MgO system melts representing the typical oxide inclusions in Si–Mn deoxidized steels is systematically investigated. The continuous cooling transformation and time–temperature transformation experiments are carried out. The results reveal that the increase of Al2O3 contents restrains the crystallization process of the melt, whereas the crystallization tendency of the melt is promoted with the increase of MgO contents. The precipitated phases are predominately 2CaO·MgO·2SiO2 and 3CaO·MgO·2SiO2, and the primary crystalline phase is unaffected by the changes of Al2O3 and MgO contents. To obtain low melting point plasticized inclusions with limited crystallization ability, it is recommended to control the Al2O3 and MgO contents greater than 15 wt% and below 5 wt%, respectively. The isothermal treatment is suggested to be controlled within a proper temperature range (1175–1250 °C) to decrease the crystallization kinetics. The oxide system's viscosity change is the limiting kinetic factor in the crystallization process, and it can be utilized to predict the system's crystallization tendency.

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CaO-SiO2-Al2O3-MgO 系统包裹体的结晶行为

在连铸和热轧过程中，低熔点 CaO-SiO2-Al2O3-MgO 系夹杂物的结晶过程对夹杂物的变形性影响很大。本文系统研究了 Al2O3 和 MgO 含量对代表 Si-Mn 脱氧钢中典型氧化物夹杂物的 CaO-SiO2-Al2O3-MgO 系熔体结晶特性的影响。进行了连续冷却转变和时间-温度转变实验。结果表明，Al2O3 含量的增加抑制了熔体的结晶过程，而 MgO 含量的增加则促进了熔体的结晶趋势。析出相主要为 2CaO-MgO-2SiO2 和 3CaO-MgO-2SiO2，主晶相不受 Al2O3 和 MgO 含量变化的影响。为了获得结晶能力有限的低熔点塑化夹杂物，建议将 Al2O3 和 MgO 的含量分别控制在 15 wt% 以上和 5 wt% 以下。建议将等温处理控制在适当的温度范围内（1175-1250 °C），以降低结晶动力学。氧化物体系的粘度变化是结晶过程中的限制动力学因素，可用于预测体系的结晶趋势。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.