Characterization and thermodynamics of Al2O3-MnO-SiO2(-MnS) inclusion formation in carbon steel billet
Characterization and thermodynamics of Al2O3-MnO-SiO2(-MnS) inclusion formation in carbon steel billet
复制标题
DOI：
10.1016/s1006-706x(15)30041-8
复制
发表时间：
2015-07
影响因子：
2.5
通讯作者：
Guocheng Wang;Sheng-li Li;X. Ai;Chong-min Zhang;Chao-bin Lai
中科院分区：
文献类型：
--
作者：
Guocheng Wang;Sheng-li Li;X. Ai;Chong-min Zhang;Chao-bin Lai
介绍了一种用有机电解液电解从钢中提取夹杂物的方法；同时利用FactSage软件计算夹杂物形成热力学。结果表明，铸坯中存在两种夹杂物，即Al 2o3 - mno - sio2 - mns （AMS- mns）和Al 2o3 - mno - sio2 （AMS）。大多数AMS-MnS包裹体颗粒直径在10 ~ 30 μm之间，呈三层结构：富含sio2的芯层（含少量Mn）、AMS中间层（含少量Al和o）和MnS外层（含少量Al和o）。热力学结果表明，在加入Si- fe合金过程中，在1 923 K以上的温度下，钢液中Si与O反应形成富sio2芯，然后在1823 ~ 1873 K时，富sio2芯与Mn、Al反应形成包裹富sio2芯的液态AMS。当温度达到1 728 K时，AMS开始析出MnS。钢液中Si、Mn、Al和O的耦合反应可形成液态AMS。
A method to extract inclusion particles from solid steel by electrolysis with organic electrolyte solution was introduced; meanwhile, thermodynamics of inclusion formation was calculated using FactSage software. The results showed that there were two kinds of inclusions in the billet, ie Al 2 O 3-MnO-SiO 2-MnS (AMS-MnS) and Al 2 O 3-MnO-SiO 2 (AMS). Most of AMS-MnS inclusion particles, with diameter of 10–30 μm, showed three-layer structures: SiO 2-rich core with a small quantity of Mn, intermediate AMS layer, and MnS outer layer containing small quantities of Al and O. Most AMS inclusion particles were 50− 90 μm and exhibited homogeneous composition. Thermodynamic results indicated that SiO 2-rich core could form firstly by Si reacting with O in molten steel at temperatures above 1 923 K during Si-Fe alloy addition, and then, the SiO 2-rich core could react with Mn and Al to form liquid AMS enveloping the SiO 2-rich core at 1823–1873 K. MnS began to precipitate from AMS when temperature reached 1 728 K. Liquid AMS could form by coupled reaction among Si, Mn, Al and O in molten steel.